Day20 Day21 C WIP

day1/c/day1.c

@@ -0,0 +1,118 @@
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+
+#define LINE_MAX_LENGTH 256
+#define NUM_0_CHARCODE 48
+#define NUM_9_CHARCODE NUM_0_CHARCODE + 9
+#define PART_2 1
+#define FORWARD 1
+#define BACKWARD -1
+
+char* english_digit_strings[] = {
+    "zero",
+    "one",
+    "two",
+    "three",
+    "four",
+    "five",
+    "six",
+    "seven",
+    "eight",
+    "nine",
+};
+
+#define NUM_OF_DIGITS ((sizeof(english_digit_strings)) / (sizeof(english_digit_strings[0])))
+
+char *english_digit_strings_reversed[NUM_OF_DIGITS];
+
+int get_num(char *p, int dir) {
+    // Check whether it is a number
+    if (*p >= NUM_0_CHARCODE && *p <= NUM_9_CHARCODE) {
+        return *p - NUM_0_CHARCODE;
+    }
+
+    // Check spelled out numbers
+    if (PART_2) {
+        // Check each digit
+        for (int i = 0; i < NUM_OF_DIGITS; i++) {
+            char *reference = dir == FORWARD ? english_digit_strings[i] : english_digit_strings_reversed[i];
+            char *tmp = p;
+            int match = 1;
+            while (*reference != '\0') {
+                if (*tmp != *reference) {
+                    match = 0;
+                    break;
+                }
+                reference++;
+                tmp += dir;
+            }
+
+            if (match) {
+                return i;
+            }
+        }
+    }
+
+    return -1;
+}
+
+char* reverse_string(char* str) {
+    char *p = str;
+    while (*p != '\0') p++;
+
+    int len = p - str;
+
+    char *newstr = (char *)malloc(len + 1);
+    memset(newstr, 0, len + 1);
+    p--;
+
+
+    char* newp = newstr;
+    while (p != str) {
+        *newp = *p;
+        newp++;
+        p--;
+    }
+    *newp = *p;
+
+    return newstr;
+}
+
+void create_reversed_digit_strings() {
+    for (int i = 0; i < NUM_OF_DIGITS; i++) {
+        english_digit_strings_reversed[i] = reverse_string(english_digit_strings[i]);
+    }
+}
+
+int main() {
+    char *p, *buf, c;
+    int sum = 0, n = -1;
+    create_reversed_digit_strings();
+
+    buf = (char *)malloc(LINE_MAX_LENGTH);
+    memset(buf, 0, LINE_MAX_LENGTH);
+    p = buf;
+
+    while ((c = getchar()) != EOF) {
+        *p++ = c;
+        if (c == '\n') {
+            // Find last number (p points to the end of line)
+            while ((n = get_num(p, BACKWARD)) == -1) p--;
+            sum += n;
+            // Find first number
+            p = buf;
+            while ((n = get_num(p, FORWARD)) == -1) p++;
+            sum += n * 10;
+
+            memset(buf, 0, LINE_MAX_LENGTH);
+            p = buf;
+        }
+    }
+
+    free(buf);
+    for (int i = 0; i < NUM_OF_DIGITS; i++) {
+        free(english_digit_strings_reversed[i]);
+    }
+    printf("%i\n", sum);
+}

day1/rust/.gitignore

@@ -0,0 +1 @@
+target

day1/rust/Cargo.lock

@@ -0,0 +1,7 @@
+# This file is automatically @generated by Cargo.
+# It is not intended for manual editing.
+version = 3
+
+[[package]]
+name = "rust"
+version = "0.1.0"

day1/rust/Cargo.toml

@@ -0,0 +1,8 @@
+[package]
+name = "rust"
+version = "0.1.0"
+edition = "2021"
+
+# See more keys and their definitions at https://doc.rust-lang.org/cargo/reference/manifest.html
+
+[dependencies]

day1/rust/src/main.rs

@@ -0,0 +1,44 @@
+fn main() {
+    let part2 = true;
+    let english_digit_names = ["zero", "one", "two", "three", "four", "five", "six", "seven", "eight", "nine"];
+
+
+    let stdin = std::io::stdin();
+    let mut sum = 0;
+
+    for line in stdin.lines() {
+        let line = line.unwrap();
+
+        let mut first: Option<u32> = None;
+        let mut last = 0;
+        for i in 0..line.chars().count() {
+            let slice = &line[i..];
+
+            let first_char = slice.chars().next().unwrap();
+            if first_char.is_digit(10) {
+                if first == None {
+                    first = first_char.to_digit(10);
+                }
+
+                last = first_char.to_digit(10).unwrap();
+            }
+
+            if part2 {
+                for (i, name) in english_digit_names.iter().enumerate() {
+                    if slice.starts_with(name) {
+                        if first == None {
+                            first = Some(i.try_into().unwrap());
+                        }
+
+                        last = i.try_into().unwrap();
+                    }
+                }
+            }
+        }
+
+        sum += first.unwrap() * 10;
+        sum += last;
+    }
+
+    println!("{}", sum);
+}

day1/sample.txt

@@ -0,0 +1,4 @@
+1abc2
+pqr3stu8vwx
+a1b2c3d4e5f
+treb7uchet

day1/sample2.txt

@@ -0,0 +1,7 @@
+two1nine
+eightwothree
+abcone2threexyz
+xtwone3four
+4nineeightseven2
+zoneight234
+7pqrstsixteen

day10/c/day10.c

@@ -0,0 +1,269 @@
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+
+#define MAX_MAP_SIZE 256
+
+typedef enum tile_type {
+    GROUND,
+    UP_DOWN,
+    LEFT_RIGHT,
+    UP_RIGHT,
+    UP_LEFT,
+    DOWN_LEFT,
+    DOWN_RIGHT,
+    START
+} tile_type_t;
+
+typedef struct tile {
+    tile_type_t type;
+    struct tile *links[2];
+    int part_of_loop;
+} tile_t;
+
+int main() {
+    char *p, *buf, c;
+
+    buf = (char *)malloc(MAX_MAP_SIZE);
+    memset(buf, 0, MAX_MAP_SIZE);
+    p = buf;
+
+    tile_t map[MAX_MAP_SIZE][MAX_MAP_SIZE];
+    memset(map, 0, MAX_MAP_SIZE*MAX_MAP_SIZE*sizeof(tile_t));
+
+    int x = 0, y = 0;
+
+    while ((c = getchar()) != EOF) {
+        *p++ = c;
+        if (c == '\n') {
+            x = 0;
+            p = buf;
+            while (*p != '\n') {
+                switch (*p) {
+                    case '.':
+                        map[x][y].type = GROUND;
+                        break;
+                    case '|':
+                        map[x][y].type = UP_DOWN;
+                        // UP
+                        if (y != 0) {
+                            map[x][y].links[0] = &map[x][y-1];
+                        }
+                        // DOWN
+                        map[x][y].links[1] = &map[x][y+1];
+                        break;
+                    case '-':
+                        map[x][y].type = LEFT_RIGHT;
+                        // LEFT
+                        if (x != 0) {
+                            map[x][y].links[0] = &map[x-1][y];
+                        }
+                        // RIGHT
+                        map[x][y].links[1] = &map[x+1][y];
+                        break;
+                    case 'L':
+                        map[x][y].type = UP_RIGHT;
+                        // UP
+                        if (y != 0) {
+                            map[x][y].links[0] = &map[x][y-1];
+                        }
+                        // RIGHT
+                        map[x][y].links[1] = &map[x+1][y];
+                        break;
+                    case 'J':
+                        map[x][y].type = UP_LEFT;
+                        // UP
+                        if (y != 0) {
+                            map[x][y].links[0] = &map[x][y-1];
+                        }
+                        // LEFT
+                        if (x != 0) {
+                            map[x][y].links[1] = &map[x-1][y];
+                        }
+                        break;
+                    case '7':
+                        map[x][y].type = DOWN_LEFT;
+                        // DOWN
+                        map[x][y].links[0] = &map[x][y+1];
+                        // LEFT
+                        if (x != 0) {
+                            map[x][y].links[1] = &map[x-1][y];
+                        }
+                        break;
+                    case 'F':
+                        map[x][y].type = DOWN_RIGHT;
+                        // DOWN
+                        map[x][y].links[0] = &map[x][y+1];
+                        // RIGHT
+                        map[x][y].links[1] = &map[x+1][y];
+                        break;
+                    case 'S':
+                        map[x][y].type = START;
+                        break;
+                }
+                p++;
+                x++;
+            }
+
+            y++;
+            memset(buf, 0, MAX_MAP_SIZE);
+            p = buf;
+        }
+    }
+
+    // Find start
+    tile_t *start, *curr, *prev;
+
+    int found = 0;
+    for (int i = 0; i < y; i++) {
+        for (int j = 0; j < x; j++) {
+            if (map[j][i].type == START) {
+                start = &map[j][i];
+                curr = start;
+                found = 1;
+                int link_num = 0;
+                // Connect up start tile
+                // UP
+                if (i != 0) {
+                    for (int k = 0; k < 2; k++) {
+                        if (map[j][i-1].links[k] == start) {
+                            start->links[link_num] = &map[j][i-1];
+                            link_num++;
+                            break;
+                        }
+                    }
+                }
+                // DOWN
+                for (int k = 0; k < 2; k++) {
+                    if (map[j][i+1].links[k] == start) {
+                        start->links[link_num] = &map[j][i+1];
+                        link_num++;
+                        break;
+                    }
+                }
+                // LEFT
+                if (j != 0) {
+                    for (int k = 0; k < 2; k++) {
+                        if (map[j-1][i].links[k] == start) {
+                            start->links[link_num] = &map[j-1][i];
+                            link_num++;
+                            break;
+                        }
+                    }
+                }
+                // RIGHT
+                for (int k = 0; k < 2; k++) {
+                    if (map[j+1][i].links[k] == start) {
+                        start->links[link_num] = &map[j+1][i];
+                        link_num++;
+                        break;
+                    }
+                }
+                // Assign the correct type to the start tile, needed for part2
+                if (start->links[0] == &map[j][i-1] && start->links[1] == &map[j][i+1]) {
+                    start->type = UP_DOWN;
+                }
+                if (start->links[0] == &map[j][i-1] && start->links[1] == &map[j+1][i]) {
+                    start->type = UP_RIGHT;
+                }
+                if (start->links[0] == &map[j][i-1] && start->links[1] == &map[j-1][i]) {
+                    start->type = UP_LEFT;
+                }
+                if (start->links[0] == &map[j-1][i] && start->links[1] == &map[j+1][i]) {
+                    start->type = LEFT_RIGHT;
+                }
+                if (start->links[0] == &map[j][i+1] && start->links[1] == &map[j-1][i]) {
+                    start->type = DOWN_LEFT;
+                }
+                if (start->links[0] == &map[j][i+1] && start->links[1] == &map[j+1][i]) {
+                    start->type = DOWN_RIGHT;
+                }
+                break;
+            }
+        }
+        if (found) {
+            break;
+        }
+    }
+
+    // Count to loop length
+    unsigned long loop_length = 0;
+    curr = start->links[0];
+    prev = start;
+    start->part_of_loop = 1;
+
+    while (curr != start) {
+        curr->part_of_loop = 1;
+        loop_length++;
+
+        for (int i = 0; i < 2; i++) {
+            if (prev != curr->links[i]) {
+                prev = curr;
+                curr = curr->links[i];
+                break;
+            }
+        }
+    }
+
+    unsigned long max_distance = loop_length % 2 ? loop_length / 2 + 1 : loop_length / 2;
+
+    printf("%lu\n", max_distance);
+
+    unsigned long inside_tile_count = 0;
+
+    for (int i = 0; i < y; i++) {
+        for (int j = 0; j < x; j++) {
+            if (map[j][i].part_of_loop) {
+                continue;
+            }
+
+            // Start going in a specific direction. (in this case right)
+            // If we are inside the pipes we will cross the pipe an odd number of times
+            int crosses = 0;
+            // If we entered a pipe through F or L we have to keep track whether we cross the pipe when leaving
+            int entry = 0;
+            for (int k = 1; k < x - j; k++) {
+                // We only care about pipes that are part of the loop
+                if (!map[j+k][i].part_of_loop) {
+                    continue;
+                }
+                // If we are 'inside a pipe' we are no crossing it
+                tile_type_t tile_type = map[j+k][i].type;
+                if (tile_type == LEFT_RIGHT) {
+                    continue;
+                }
+                // Entering the loop. We are not crossing it yet, it depends on the exit tile
+                if (tile_type == DOWN_RIGHT || tile_type == UP_RIGHT) {
+                    if (tile_type == DOWN_RIGHT) {
+                        entry = 1;
+                    } else {
+                        entry = 2;
+                    }
+                    continue;
+                }
+                // Vertical pipe, we are crossing the loop
+                if (tile_type == UP_DOWN) {
+                    crosses += 1;
+                    entry = 0;
+                    continue;
+                }
+                // Exiting loop, check whether we crossed
+                if (tile_type == DOWN_LEFT || tile_type == UP_LEFT) {
+                    if ((tile_type == DOWN_LEFT && entry == 2) || (tile_type == UP_LEFT && entry == 1)) {
+                        crosses += 1;
+                    }
+                    entry = 0;
+                    continue;
+                }
+            }
+
+            if (crosses % 2) {
+                inside_tile_count++;
+            }
+        }
+    }
+
+    printf("%lu\n", inside_tile_count);
+
+    free(buf);
+}

day10/input.txt

@@ -0,0 +1,140 @@
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day10/sample.txt

@@ -0,0 +1,5 @@
+.....
+.S-7.
+.|.|.
+.L-J.
+.....

day10/sample2.txt

@@ -0,0 +1,5 @@
+..F7.
+.FJ|.
+SJ.L7
+|F--J
+LJ...

day10/sample3.txt

@@ -0,0 +1,9 @@
+...........
+.S-------7.
+.|F-----7|.
+.||.....||.
+.||.....||.
+.|L-7.F-J|.
+.|..|.|..|.
+.L--J.L--J.
+...........

day10/sample4.txt

@@ -0,0 +1,10 @@
+.F----7F7F7F7F-7....
+.|F--7||||||||FJ....
+.||.FJ||||||||L7....
+FJL7L7LJLJ||LJ.L-7..
+L--J.L7...LJS7F-7L7.
+....F-J..F7FJ|L7L7L7
+....L7.F7||L7|.L7L7|
+.....|FJLJ|FJ|F7|.LJ
+....FJL-7.||.||||...
+....L---J.LJ.LJLJ...

day10/sample5.txt

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day11/c/day11.c

@@ -0,0 +1,131 @@
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+
+#define LINE_MAX_LENGTH 256
+#define MAX_GALAXIES 1024
+#define abs(a) ((a) > 0 ? (a) : -(a))
+#define PART2 1
+#define EXPANSION_RATE (PART2 ? 999999 : 1)
+
+typedef enum tile {
+    EMPTY,
+    GALAXY
+} tile_t;
+
+typedef struct position {
+    int x;
+    int y;
+} position_t;
+
+void expand_universe(int universe_x, int universe_y, tile_t universe[LINE_MAX_LENGTH][LINE_MAX_LENGTH], position_t galaxies[], int galaxies_num, int expansion_rate);
+
+int main() {
+    char *p, *buf, c;
+
+    buf = (char *)malloc(LINE_MAX_LENGTH);
+    memset(buf, 0, LINE_MAX_LENGTH);
+    p = buf;
+
+    tile_t universe[LINE_MAX_LENGTH][LINE_MAX_LENGTH];
+    memset(universe, 0, LINE_MAX_LENGTH*LINE_MAX_LENGTH*sizeof(tile_t));
+
+    position_t galaxies[MAX_GALAXIES];
+    memset(galaxies, 0, MAX_GALAXIES*sizeof(position_t));
+
+    int x = 0, y = 0, galaxies_num = 0;
+
+    while ((c = getchar()) != EOF) {
+        *p++ = c;
+        if (c == '\n') {
+            x = 0;
+
+            p = buf;
+            while (*p != '\n') {
+                switch (*p) {
+                    case '.':
+                        universe[x][y] = EMPTY;
+                        break;
+                    case '#':
+                        universe[x][y] = GALAXY;
+                        galaxies[galaxies_num].x = x;
+                        galaxies[galaxies_num].y = y;
+                        galaxies_num++;
+                        break;
+                }
+                x++;
+                p++;
+            }
+
+
+            y++;
+            memset(buf, 0, LINE_MAX_LENGTH);
+            p = buf;
+        }
+    }
+
+    expand_universe(x, y, universe, galaxies, galaxies_num, EXPANSION_RATE);
+
+    unsigned long part1 = 0;
+
+    for (int i = 0; i < galaxies_num; i++) {
+        for (int j = i; j < galaxies_num; j++) {
+            part1 += abs(galaxies[i].x - galaxies[j].x);
+            part1 += abs(galaxies[i].y - galaxies[j].y);
+        }
+    }
+
+    printf("%lu\n", part1);
+
+    free(buf);
+}
+
+void expand_universe(int universe_x, int universe_y, tile_t universe[LINE_MAX_LENGTH][LINE_MAX_LENGTH], position_t galaxies[], int galaxies_num, int expansion_rate) {
+    int empty;
+    position_t galaxy_offsets[MAX_GALAXIES];
+    memset(galaxy_offsets, 0, MAX_GALAXIES*sizeof(position_t));
+    // Empty rows
+    for (int i = 0; i < universe_y; i++) {
+        empty = 1;
+        for (int j = 0; j < universe_x; j++) {
+            if (universe[j][i] != EMPTY) {
+                empty = 0;
+                break;
+            }
+        }
+
+        if (empty) {
+            // Shift existing galaxies
+            for (int k = 0; k < galaxies_num; k++) {
+                if (galaxies[k].y > i) {
+                    galaxy_offsets[k].y += expansion_rate;
+                }
+            }
+        }
+    }
+    // Empty columns
+    for (int i = 0; i < universe_x; i++) {
+        empty = 1;
+        for (int j = 0; j < universe_y; j++) {
+            if (universe[i][j] != EMPTY) {
+                empty = 0;
+                break;
+            }
+        }
+
+        if (empty) {
+            // Shift existing galaxies
+            for (int k = 0; k < galaxies_num; k++) {
+                if (galaxies[k].x > i) {
+                    galaxy_offsets[k].x += expansion_rate;
+                }
+            }
+        }
+    }
+
+
+    for (int i = 0; i < galaxies_num; i++) {
+        galaxies[i].x += galaxy_offsets[i].x;
+        galaxies[i].y += galaxy_offsets[i].y;
+    }
+}

day11/input.txt

@@ -0,0 +1,140 @@
+.....#.....#......#.............................#........#.......................#...........#..............................................
+#......................................#....................................................................#........................#......
+.................................................................................................#...........................#..............
+............................#......#.................................................................................#......................
+..............#.............................................#..............................................................................#
+....................................................#....................#..................................................................
+..........................................................................................................#.................................
+...#...............#.............#...................................#.........#..................#...............................#.........
+........#................................#...................................................................................#..............
+..........................................................#................#................................................................
+....................................................................................................................#.......................
+.....................................#......................................................................................................
+.....................#.......................................#...........................#..........................................#.......
+.............#.........................................................#........#...........................................................
+......#.......................#..................#...................................#..............#........................#..............
+.................#........................#..........................................................................#.....................#
+............................................................................................................................................
+..........#....................................................#...........#................#..............#................................
+...........................#....................................................................................................#...........
+............................................................................................................................................
+...#...................#..............#........#...................#..................................................#.....................
+..........................................................#.....................................#...........................................
+...............................................................................#........................#.............................#.....
+.............#.................#............................................................................................................
+...................................................................................#................#.......................................
+............................................#...........................#................#...........................#......................
+.................#..........................................#............................................................................#..
+......#............................................................#.............................................#..........................
+.........................#...........#..........#...............................................#.........................#.................
+..#...................................................#...........................#.....................#...................................
+............................................................................................................................................
+.........#....................#...........................................#.........................................#...........#...........
+.......................................#....................#.............................#.................................................
+..............#...................................................#.......................................#.................................
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+...#................#....................................................................................................................#..
+............................................#...........................................#...................................................
+......................................................#...............................................#.....................................
+.................#...............#.........................#........#..........................#......................#.....#...............
+......#....................#.............#.....#...........................................................#................................
+...........#.........#...........................................................#..............................#...........................
+.......................................................................................................................................#....
+............................................#.......................................................#.........................#.............
+.......................................................................#.................................................#..................
+...#.......................................................#......#.........................#.............................................#.
+...............................#.................#..........................................................................................
+..................#.....#...........#........................................#.....................................#........................
+......................................................................................................................................#.....
+..........#..............................................................#..................................................................
+.............................................................................................#...................................#..........
+#....................#..................#..............#....................................................................................
+...................................#............................#.....#.....................................................#...........#...
+..........................................................................................#.........#..............#........................
+.....#.........................................#............................................................#...............................
+.............#.......................................................................................................................#......
+...........................................................#..............#...............................................................#.
+......................................................................................................#.....................................
+........................#........#..................#.................................#.....#...............................................
+.........#...............................#.....................................#............................................................
+..............................................................#...............................................#............#................
+............................................................................................................................................
+#............#...............................#..............................................................................................
+......................#......#...........................#.............................................................#....................
+............................................................................................................................................
+....#..............................#.........................#.....................#...............#........................................
+.............................................................................#....................................#.........................
+........#........#.......#.............................................................#..................................................#.
+........................................................................................................................#...................
+.#..............................#................#..............#......#....................................................................
+.........................................................................................................#......#...........................
+...............#...........#...........#....................#..............................................................#.....#..........
+....#..............................................................................#.....#..................................................
+............................................................................................................................................
+..........#.......................#..........#.............................#................................................................
+.............................................................................................................#.......#......................
+............................................................................................................................................
+......................................................#.........#...........................................................................
+...........................................#................................................#.................................#.............
+.........................#...........#...........#..........#................#..................................#...................#.....#.
+............#.......................................................#................#..................#...................................
+.....#...............#.........#.........................................#..................................................................
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+..........#.................................................................................................#...............#...............
+.......................................#.......................#........................#........................#..........................
+..............#.........#......................................................#............................................................
+.............................#..............#.........#.......................................#......#...............................#......
+......................................................................#...................................................................#.
+....#.......................................................................................................................................
+.........#.............................................................................................................#....................
+...................................#....................#........................#............................................#.............
+.....................#.....................................................#................................................................
+......#.............................................................#...................#...............#...........................#.......
+...............#.............................#.................#..........................................................#.................
+.................................#......#.........................................................#.........................................
+................................................................................#.................................#............#.........#..
+.......................................................#..............#.....................................................................
+...#......#..........#......#................................#............................................#.................................
+..................................................#...................................................................#.....................
+......................................................................................................#.....................................
+...................................................................#..........................................................#.............
+...................#....................#................#...............#..................................................................
+#..........................#..................................#......................#......................#......................#.......#
+.................................................#..........................................................................................
+...............................#....................................................................#............#..........................
+.............................................................................................#............................#.................
+..........#.............#.................................................#.............................................................#...
+.#................#........................#...................................#............................................................
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+...........................................................#............................................#...................................
+.......#.......#....................................#...................................#...................................................
+.................................#.............................#...................................#..........#........#....................
+...........................#...........#......#...............................................#..................................#..........
+..#.....................................................#.................#......#..........................................................
+..................#................................................#....................................................................#...
+............................................................................................................................................
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+.......#.................#............................................#.........................#...........#.......................#.......
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+......................#...................................................................#.................................................
+..................................#..................................#......#...............................................................
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+.#...............................................#....................................................#............#................#.......
+............#..........................#.........................#..........................................................................
+........................#....................#.............................................................................................#
+........................................................................................#.................#..............#..................
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+..............................................................#.......#..............................................#......................
+........#.....................#.....#.............................................................#....................................#....
+......................#...................................#.......#.........................................................................
+..#.............#...........................#.....................................#...........................#.............#...............

day11/rust/.gitignore

@@ -0,0 +1 @@
+target

day11/rust/Cargo.lock

@@ -0,0 +1,7 @@
+# This file is automatically @generated by Cargo.
+# It is not intended for manual editing.
+version = 3
+
+[[package]]
+name = "rust"
+version = "0.1.0"

day11/rust/Cargo.toml

@@ -0,0 +1,8 @@
+[package]
+name = "rust"
+version = "0.1.0"
+edition = "2021"
+
+# See more keys and their definitions at https://doc.rust-lang.org/cargo/reference/manifest.html
+
+[dependencies]

day11/rust/src/main.rs

@@ -0,0 +1,126 @@
+enum Tile {
+    Empty,
+    Galaxy,
+}
+
+#[derive(Clone)]
+#[derive(Debug)]
+struct Position {
+    x: usize,
+    y: usize,
+}
+
+fn main() {
+    let stdin = std::io::stdin();
+
+    let mut universe = Vec::new();
+
+    for line in stdin.lines() {
+        let line = line.unwrap();
+
+        let row: Vec<_> = line
+            .chars()
+            .map(|e| match e {
+                '.' => Tile::Empty,
+                '#' => Tile::Galaxy,
+                _ => unreachable!(),
+            })
+            .collect();
+
+        universe.push(row);
+    }
+
+    let mut original_galaxies = Vec::new();
+
+    for i in 0..universe.len() {
+        for j in 0..universe[i].len() {
+            if let Tile::Galaxy = universe[i][j] {
+                original_galaxies.push(Position { x: j, y: i })
+            }
+        }
+    }
+
+
+    let mut galaxies = original_galaxies.clone();
+
+    expand_universe(&universe, &mut galaxies, 2);
+
+    let mut part1 = 0;
+
+    for i in 0..galaxies.len() {
+        for j in i..galaxies.len() {
+            part1 += galaxies[i].x.abs_diff(galaxies[j].x);
+            part1 += galaxies[i].y.abs_diff(galaxies[j].y);
+        }
+    }
+
+    println!("{}", part1);
+
+    let mut galaxies = original_galaxies.clone();
+
+    expand_universe(&universe, &mut galaxies, 1_000_000);
+
+    let mut part2 = 0;
+
+    for i in 0..galaxies.len() {
+        for j in i..galaxies.len() {
+            part2 += galaxies[i].x.abs_diff(galaxies[j].x);
+            part2 += galaxies[i].y.abs_diff(galaxies[j].y);
+        }
+    }
+
+    println!("{}", part2);
+}
+
+fn expand_universe(
+    universe: &Vec<Vec<Tile>>,
+    galaxies: &mut Vec<Position>,
+    expansion_rate: usize,
+) -> () {
+    let mut galaxy_offsets = Vec::new();
+
+    for _ in 0..galaxies.len() {
+        galaxy_offsets.push(Position { x: 0, y: 0 });
+    }
+
+    for i in 0..universe.len() {
+        if universe[i].iter().all(|e| match e {
+            Tile::Empty => true,
+            _ => false,
+        }) {
+            for (j, galaxy) in galaxies.iter().enumerate() {
+                if galaxy.y > i {
+                    galaxy_offsets[j].y += expansion_rate - 1;
+                }
+            }
+        }
+    }
+
+    let mut columns = Vec::new();
+
+    for i in 0..universe[0].len() {
+        let mut column = Vec::new();
+        for j in 0..universe.len() {
+            column.push(&universe[j][i]);
+        }
+        columns.push(column);
+    }
+
+    for i in 0..columns.len() {
+        if columns[i].iter().all(|e| match e {
+            Tile::Empty => true,
+            _ => false,
+        }) {
+            for (j, galaxy) in galaxies.iter().enumerate() {
+                if galaxy.x > i {
+                    galaxy_offsets[j].x += expansion_rate - 1;
+                }
+            }
+        }
+    }
+
+    for (i, galaxy) in galaxies.iter_mut().enumerate() {
+        galaxy.x += galaxy_offsets[i].x;
+        galaxy.y += galaxy_offsets[i].y;
+    }
+}

day11/sample.txt

@@ -0,0 +1,10 @@
+...#......
+.......#..
+#.........
+..........
+......#...
+.#........
+.........#
+..........
+.......#..
+#...#.....

day13/c/day13.c

@@ -0,0 +1,171 @@
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+
+#define LINE_MAX_LENGTH 256
+#define MAX_PATTERNS 256
+#define min(a,b) ((a) < (b) ? (a) : (b))
+
+typedef enum tile {
+    ASH,
+    ROCK,
+} tile_t;
+
+typedef struct pattern {
+    tile_t map[LINE_MAX_LENGTH][LINE_MAX_LENGTH];
+    int x;
+    int y;
+} pattern_t;
+
+int symmetric(pattern_t *patterns, int patterns_num);
+
+int main() {
+    char *p, *buf, c;
+
+    buf = (char *)malloc(LINE_MAX_LENGTH);
+    memset(buf, 0, LINE_MAX_LENGTH);
+    p = buf;
+
+    pattern_t *patterns;
+    patterns = (pattern_t*)malloc(MAX_PATTERNS * sizeof(pattern_t));
+    memset(patterns, 0, MAX_PATTERNS * sizeof(pattern_t));
+    int x = 0, y = 0, patterns_num = 0;
+
+    while ((c = getchar()) != EOF) {
+        *p++ = c;
+        if (c == '\n') {
+            p = buf;
+
+            if (*p == '\n') {
+                patterns[patterns_num].x = x;
+                patterns[patterns_num].y = y;
+                patterns_num++;
+                y = 0;
+                memset(buf, 0, LINE_MAX_LENGTH);
+                continue;
+            }
+
+            x = 0;
+            while (*p != '\n') {
+                switch (*p) {
+                    case '.':
+                        patterns[patterns_num].map[x][y] = ASH;
+                        break;
+                    case '#':
+                        patterns[patterns_num].map[x][y] = ROCK;
+                        break;
+                }
+                x++;
+                p++;
+            }
+            y++;
+            memset(buf, 0, LINE_MAX_LENGTH);
+            p = buf;
+        }
+    }
+
+    int part1 = symmetric(patterns, patterns_num);
+    printf("%i\n", part1);
+
+    int part2 = 0;
+    int symmetric_offset = 0;
+    for (int i = 0; i < patterns_num; i++) {
+        for (int j = 1; j < patterns[i].x; j++) {
+            int mind = min(j, patterns[i].x - j);
+            symmetric_offset = 0;
+            for (int k = 0; k < mind; k++) {
+                for (int l = 0; l < patterns[i].y; l++) {
+                    if (patterns[i].map[j - k - 1][l] != patterns[i].map[j + k][l]) {
+                        symmetric_offset++;
+                    }
+                }
+            }
+
+            if (symmetric_offset == 1) {
+                part2 += j;
+                break;
+            }
+        }
+
+        if (symmetric_offset == 1) {
+            continue;
+        }
+
+        for (int j = 1; j < patterns[i].y; j++) {
+            int mind = min(j, patterns[i].y - j);
+            symmetric_offset = 0;
+            for (int k = 0; k < mind; k++) {
+                for (int l = 0; l < patterns[i].x; l++) {
+                    if (patterns[i].map[l][j - k - 1] != patterns[i].map[l][j + k]) {
+                        symmetric_offset++;
+                    }
+                }
+            }
+
+            if (symmetric_offset == 1) {
+                part2 += 100 * j;
+                break;
+            }
+        }
+    }
+
+    printf("%i\n", part2);
+
+    free(buf);
+    free(patterns);
+}
+
+int symmetric(pattern_t *patterns, int patterns_num) {
+    int sum = 0;
+    int symmetric = 1;
+    for (int i = 0; i < patterns_num; i++) {
+        for (int j = 1; j < patterns[i].x; j++) {
+            int mind = min(j, patterns[i].x - j);
+            symmetric = 1;
+            for (int k = 0; k < mind; k++) {
+                for (int l = 0; l < patterns[i].y; l++) {
+                    if (patterns[i].map[j - k - 1][l] != patterns[i].map[j + k][l]) {
+                        symmetric = 0;
+                        break;
+                    }
+                }
+                if (!symmetric) {
+                    break;
+                }
+            }
+
+            if (symmetric) {
+                sum += j;
+                break;
+            }
+        }
+
+        if (symmetric) {
+            continue;
+        }
+
+        for (int j = 1; j < patterns[i].y; j++) {
+            int mind = min(j, patterns[i].y - j);
+            symmetric = 1;
+
+            for (int k = 0; k < mind; k++) {
+                for (int l = 0; l < patterns[i].x; l++) {
+                    if (patterns[i].map[l][j - k - 1] != patterns[i].map[l][j + k]) {
+                        symmetric = 0;
+                        break;
+                    }
+                }
+                if (!symmetric) {
+                    break;
+                }
+            }
+
+            if (symmetric) {
+                sum += 100 * j;
+                break;
+            }
+        }
+    }
+
+    return sum;
+}

day13/sample.txt

@@ -0,0 +1,16 @@
+#.##..##.
+..#.##.#.
+##......#
+##......#
+..#.##.#.
+..##..##.
+#.#.##.#.
+
+#...##..#
+#....#..#
+..##..###
+#####.##.
+#####.##.
+..##..###
+#....#..#
+

day14/c/day14.c

@@ -0,0 +1,204 @@
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+
+#define LINE_MAX_LENGTH 256
+#define MAX_ROUNDED_ROCKS 8*1024
+#define MAX_HISTORY_SIZE 2048
+#define abs(a) ((a) > 0 ? (a) : -(a))
+#define CYCLES 1000000000
+
+typedef enum tile {
+    EMPTY,
+    ROUNDED_ROCK,
+    CUBE_ROCK,
+} tile_t;
+
+typedef struct position {
+    int x;
+    int y;
+} position_t;
+
+void tilt(tile_t map[LINE_MAX_LENGTH][LINE_MAX_LENGTH], int x, int y, int dir[2]);
+
+int main() {
+    char *p, *buf, c;
+
+    buf = (char *)malloc(LINE_MAX_LENGTH);
+    memset(buf, 0, LINE_MAX_LENGTH);
+    p = buf;
+
+    position_t rocks[MAX_ROUNDED_ROCKS];
+    int rocks_num = 0, x = 0, y = 0;
+
+    tile_t map[LINE_MAX_LENGTH][LINE_MAX_LENGTH];
+
+    while ((c = getchar()) != EOF) {
+        *p++ = c;
+        if (c == '\n') {
+            x = 0;
+            p = buf;
+            while (*p != '\n') {
+                switch (*p) {
+                    case '.':
+                        map[x][y] = EMPTY;
+                        break;
+                    case '#':
+                        map[x][y] = CUBE_ROCK;
+                        break;
+                    case 'O':
+                        map[x][y] = ROUNDED_ROCK;
+                        rocks[rocks_num].x = x;
+                        rocks[rocks_num].y = y;
+                        rocks_num++;
+                        break;
+                }
+                p++;
+                x++;
+            }
+
+            y++;
+            memset(buf, 0, LINE_MAX_LENGTH);
+            p = buf;
+        }
+    }
+
+    int dir[2] = {0, -1};
+    tilt(map, x, y, dir);
+
+
+    int part1 = 0;
+    for (int i = 0; i < y; i++) {
+        for (int j = 0; j < x; j++) {
+            if (map[j][i] == ROUNDED_ROCK) {
+                part1 += y - i;
+            }
+        }
+    }
+
+    printf("%i\n", part1);
+
+    tile_t ***history = (tile_t***)malloc(MAX_HISTORY_SIZE * sizeof(tile_t**));
+    for (int i = 0; i < MAX_HISTORY_SIZE; i++) {
+        history[i] = malloc(LINE_MAX_LENGTH * LINE_MAX_LENGTH * sizeof(tile_t));
+    }
+    int history_num = 0;
+
+    int offset = 0, period = 0;
+    for (int i = 0; i < CYCLES; i++) {
+        int found = 0;
+        for (int j = 0; j < history_num; j++) {
+            if (!memcmp(map, history[j], LINE_MAX_LENGTH * LINE_MAX_LENGTH * sizeof(tile_t))) {
+                offset = j;
+                period = history_num - j;
+                found = 1;
+                break;
+            }
+        }
+        if (!found) {
+            memcpy(history[history_num], map, LINE_MAX_LENGTH * LINE_MAX_LENGTH * sizeof(tile_t));
+            history_num++;
+        }
+        if (found) {
+            break;
+        }
+        if (i != 0) {
+            dir[0] = 0;
+            dir[1] = -1;
+            tilt(map, x, y, dir);
+        }
+        dir[0] = -1;
+        dir[1] = 0;
+        tilt(map, x, y, dir);
+        dir[0] = 0;
+        dir[1] = 1;
+        tilt(map, x, y, dir);
+        dir[0] = 1;
+        dir[1] = 0;
+        tilt(map, x, y, dir);
+    }
+
+    for (int i = 0; i < (CYCLES - history_num) % period; i++) {
+        dir[0] = 0;
+        dir[1] = -1;
+        tilt(map, x, y, dir);
+        dir[0] = -1;
+        dir[1] = 0;
+        tilt(map, x, y, dir);
+        dir[0] = 0;
+        dir[1] = 1;
+        tilt(map, x, y, dir);
+        dir[0] = 1;
+        dir[1] = 0;
+        tilt(map, x, y, dir);
+    }
+
+    int part2 = 0;
+    for (int i = 0; i < y; i++) {
+        for (int j = 0; j < x; j++) {
+            if (map[j][i] == ROUNDED_ROCK) {
+                part2 += y - i;
+            }
+        }
+    }
+
+    printf("%i\n", part2);
+
+    for (int i = 0; i < MAX_HISTORY_SIZE; i++) {
+        free(history[i]);
+    }
+    free(history);
+    free(buf);
+}
+
+void tilt(tile_t map[LINE_MAX_LENGTH][LINE_MAX_LENGTH], int x, int y, int dir[2]) {
+    position_t start;
+    int *iterate, iter_length;
+    if (dir[0] == 1) {
+        start.x = x - 1;
+        start.y = 0;
+        iterate = &start.y;
+        iter_length = y;
+    } else if (dir[0] == -1) {
+        start.x = 0;
+        start.y = 0;
+        iterate = &start.y;
+        iter_length = y;
+    } else if (dir[1] == 1) {
+        start.x = 0;
+        start.y = y - 1;
+        iterate = &start.x;
+        iter_length = x;
+    } else if (dir[1] == -1) {
+        start.x = 0;
+        start.y = 0;
+        iterate = &start.x;
+        iter_length = x;
+    }
+
+    position_t to_put;
+    for (int i = 0; i < iter_length; i++) {
+        *iterate = i;
+        memcpy(&to_put, &start, sizeof(position_t));
+        int *iterate_secondary = iter_length == x ? &to_put.y : &to_put.x, iter_length_secondary = iter_length == x ? y : x;
+        for (int j = 0; j < iter_length_secondary; j++) {
+            int cx = start.x - dir[0] * j;
+            int cy = start.y - dir[1] * j;
+            tile_t current_tile = map[cx][cy];
+            switch (current_tile) {
+                case EMPTY:
+                    break;
+                case ROUNDED_ROCK:
+                    map[cx][cy] = EMPTY;
+                    map[to_put.x][to_put.y] = ROUNDED_ROCK;
+                    to_put.x -= dir[0];
+                    to_put.y -= dir[1];
+                    break;
+                case CUBE_ROCK:
+                    to_put.x = cx - dir[0];
+                    to_put.y = cy - dir[1];
+                    break;
+            }
+        }
+    }
+}

day14/input.txt

@@ -0,0 +1,100 @@
+...#.#.O....#.#.OO.OOO.O..O.......O#OO#.#..#....O...#.....O.O#..O..OO..O.#...#O..#...O...##O...OO...
+#O....O#..O.#.#..O#...#O.O....#O.#.#O#........O...O..#.OOO#O#.......OO##O.#.OO.O.#...##.##....O#..O#
+.O.......O.O.O.O..O.O.....#....O#..#.#O.#OO...#O.O#.O#..#O...#...O.O.......#.O....O.#..#.O##O#..O...
+...O....#.OO..#..OO#..##....#O.......OOOOOO...OO..#...#.O..O....#O..OO.#O...#O#...O..O#..OO....#....
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day14/sample.txt

@@ -0,0 +1,10 @@
+O....#....
+O.OO#....#
+.....##...
+OO.#O....O
+.O.....O#.
+O.#..O.#.#
+..O..#O..O
+.......O..
+#....###..
+#OO..#....

day15/c/day15.c

@@ -0,0 +1,112 @@
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+
+#define LINE_MAX_LENGTH 32*1024
+#define STRBUF_SIZE 64
+#define NUM_BOXES 256
+#define MAX_LENS_PER_BOX 32
+#define NUM_0_CHARCODE 48
+
+typedef struct lens {
+    char label[STRBUF_SIZE];
+    int label_len;
+    int focal_length;
+} lens_t;
+
+typedef struct box {
+    lens_t lenses[MAX_LENS_PER_BOX];
+    int lenses_num;
+} box_t;
+
+int hash(char*, int);
+
+int main() {
+    char *p, *buf, c, *start;
+
+    buf = (char *)malloc(LINE_MAX_LENGTH);
+    memset(buf, 0, LINE_MAX_LENGTH);
+    p = buf;
+    char strbuf[STRBUF_SIZE];
+    memset(strbuf, 0, STRBUF_SIZE * sizeof(char));
+
+    box_t boxes[NUM_BOXES];
+    memset(boxes, 0, NUM_BOXES * sizeof(box_t));
+
+    int sum = 0;
+    while ((c = getchar()) != EOF) {
+        *p++ = c;
+        if (c == '\n') {
+            p = buf;
+            start = p;
+            while (*p != '\0') {
+                while (*p != ',' && *p != '\n') p++;
+                strncpy(strbuf, start, p - start);
+                sum += hash(strbuf, p - start);
+                // Find = or -
+                while (*p != '-' && *p != '=') p--;
+                int box_num = hash(strbuf, p - start);
+                if (*p == '-') {
+                    for (int i = 0; i < boxes[box_num].lenses_num; i++) {
+                        if (boxes[box_num].lenses[i].label_len == p - start && !strncmp(boxes[box_num].lenses[i].label, strbuf, p - start)) {
+                            for (int j = i; j < boxes[box_num].lenses_num - 1; j++) {
+                                memcpy(&boxes[box_num].lenses[j], &boxes[box_num].lenses[j + 1], sizeof(lens_t));
+                            }
+                            boxes[box_num].lenses_num--;
+                            break;
+                        }
+                    }
+                    p++;
+                } else if (*p == '=') {
+                    int found = 0;
+                    int focal_length = *(p+1) - NUM_0_CHARCODE;
+                    for (int i = 0; i < boxes[box_num].lenses_num; i++) {
+                        if (boxes[box_num].lenses[i].label_len == p - start && !strncmp(boxes[box_num].lenses[i].label, strbuf, p - start)) {
+                            boxes[box_num].lenses[i].focal_length = focal_length;
+                            found = 1;
+                            break;
+                        }
+                    }
+
+                    if (!found) {
+                        boxes[box_num].lenses[boxes[box_num].lenses_num].label_len = p - start;
+                        boxes[box_num].lenses[boxes[box_num].lenses_num].focal_length = focal_length;
+                        strncpy(boxes[box_num].lenses[boxes[box_num].lenses_num].label, strbuf, p - start);
+                        boxes[box_num].lenses_num++;
+                    }
+                    p++;
+                    p++;
+                }
+
+                p++;
+                start = p;
+                memset(strbuf, 0, STRBUF_SIZE * sizeof(char));
+            }
+            memset(buf, 0, LINE_MAX_LENGTH);
+            p = buf;
+        }
+    }
+
+    int part2 = 0;
+    for (int i = 0; i < NUM_BOXES; i++) {
+        for (int j = 0; j < boxes[i].lenses_num; j++) {
+            part2 += (i+1) * (j+1) * boxes[i].lenses[j].focal_length;
+        }
+    }
+
+    printf("%i\n", sum);
+    printf("%i\n", part2);
+    free(buf);
+}
+
+int hash(char *str, int len) {
+    int current_value = 0;
+
+    for (int i = 0; i < len; i++) {
+        current_value += str[i];
+        current_value *= 17;
+        current_value %= 256;
+    }
+
+    return current_value;
+}

day15/sample.txt

@@ -0,0 +1 @@
+rn=1,cm-,qp=3,cm=2,qp-,pc=4,ot=9,ab=5,pc-,pc=6,ot=7

day16/c/day16.c

@@ -0,0 +1,208 @@
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+
+#define LINE_MAX_LENGTH 256
+
+typedef enum tile_type {
+    EMPTY,
+    MIRROR_LEFT_TO_UP,
+    MIRROR_LEFT_TO_DOWN,
+    SPLITTER_VERTICAL,
+    SPLITTER_HORIZONTAL,
+} tile_type_t;
+
+typedef enum light_direction {
+    LEFT_TO_RIGHT,
+    RIGHT_TO_LEFT,
+    UP_TO_DOWN,
+    DOWN_TO_UP,
+} light_direction_t;
+
+typedef struct tile {
+    tile_type_t type;
+    light_direction_t lights[4];
+    int lights_num;
+} tile_t;
+
+void traverse_light(tile_t map[LINE_MAX_LENGTH][LINE_MAX_LENGTH], int x, int y, int entry_x, int entry_y, int dir[2]);
+int has_light(tile_t map[LINE_MAX_LENGTH][LINE_MAX_LENGTH], int x, int y, light_direction_t direction, int max_x, int max_y);
+light_direction_t dir_to_direction(int dir[2]);
+int count_energized(tile_t map[LINE_MAX_LENGTH][LINE_MAX_LENGTH], int x, int y);
+
+int main() {
+    char *p, *buf, c;
+
+    buf = (char *)malloc(LINE_MAX_LENGTH);
+    memset(buf, 0, LINE_MAX_LENGTH);
+    p = buf;
+
+    tile_t map[LINE_MAX_LENGTH][LINE_MAX_LENGTH];
+    memset(map, 0, LINE_MAX_LENGTH * LINE_MAX_LENGTH * sizeof(tile_t));
+    int x = 0, y = 0;
+
+    while ((c = getchar()) != EOF) {
+        *p++ = c;
+        if (c == '\n') {
+            p = buf;
+            x = 0;
+
+            while (*p != '\n') {
+                switch (*p) {
+                    case '.':
+                        map[x][y].type = EMPTY;
+                        break;
+                    case '/':
+                        map[x][y].type = MIRROR_LEFT_TO_UP;
+                        break;
+                    case '\\':
+                        map[x][y].type = MIRROR_LEFT_TO_DOWN;
+                        break;
+                    case '|':
+                        map[x][y].type = SPLITTER_VERTICAL;
+                        break;
+                    case '-':
+                        map[x][y].type = SPLITTER_HORIZONTAL;
+                        break;
+                }
+                x++;
+                p++;
+            }
+            y++;
+            memset(buf, 0, LINE_MAX_LENGTH);
+            p = buf;
+        }
+    }
+
+    tile_t map_cpy[LINE_MAX_LENGTH][LINE_MAX_LENGTH];
+    memcpy(map_cpy, map, LINE_MAX_LENGTH * LINE_MAX_LENGTH * sizeof(tile_t));
+
+    int dir[2] = {1, 0};
+    traverse_light(map_cpy, x, y, -1, 0, dir);
+    int part1 = count_energized(map_cpy, x, y);
+
+    int max_energized = 0, energized;
+    // LEFT COLUMN
+    for (int i = 0; i < y; i++) {
+        dir[0] = 1;
+        dir[1] = 0;
+        memcpy(map_cpy, map, LINE_MAX_LENGTH * LINE_MAX_LENGTH * sizeof(tile_t));
+        traverse_light(map_cpy, x, y, -1, i, dir);
+        energized = count_energized(map_cpy, x, y);
+
+        if (energized > max_energized) {
+            max_energized = energized;
+        }
+    }
+    // RIGHT COLUMN
+    for (int i = 0; i < y; i++) {
+        dir[0] = -1;
+        dir[1] = 0;
+        memcpy(map_cpy, map, LINE_MAX_LENGTH * LINE_MAX_LENGTH * sizeof(tile_t));
+        traverse_light(map_cpy, x, y, x, i, dir);
+        energized = count_energized(map_cpy, x, y);
+
+        if (energized > max_energized) {
+            max_energized = energized;
+        }
+    }
+    // TOP ROW
+    for (int i = 0; i < x; i++) {
+        dir[0] = 0;
+        dir[1] = 1;
+        memcpy(map_cpy, map, LINE_MAX_LENGTH * LINE_MAX_LENGTH * sizeof(tile_t));
+        traverse_light(map_cpy, x, y, i, -1, dir);
+        energized = count_energized(map_cpy, x, y);
+
+        if (energized > max_energized) {
+            max_energized = energized;
+        }
+    }
+    // BOTTOM ROW
+    for (int i = 0; i < x; i++) {
+        dir[0] = 0;
+        dir[1] = -1;
+        memcpy(map_cpy, map, LINE_MAX_LENGTH * LINE_MAX_LENGTH * sizeof(tile_t));
+        traverse_light(map_cpy, x, y, i, y, dir);
+        energized = count_energized(map_cpy, x, y);
+
+        if (energized > max_energized) {
+            max_energized = energized;
+        }
+    }
+
+    printf("%i\n", part1);
+    printf("%i\n", max_energized);
+    free(buf);
+}
+
+void traverse_light(tile_t map[LINE_MAX_LENGTH][LINE_MAX_LENGTH], int x, int y, int entry_x, int entry_y, int dir[2]) {
+    light_direction_t curr_direction = dir_to_direction(dir);
+
+    int curr_x = entry_x, curr_y = entry_y;
+
+    while (!has_light(map, curr_x + dir[0], curr_y + dir[1], curr_direction, x - 1, y - 1)) {
+        curr_x += dir[0];
+        curr_y += dir[1];
+        map[curr_x][curr_y].lights[map[curr_x][curr_y].lights_num] = curr_direction;
+        map[curr_x][curr_y].lights_num++;
+
+        if (map[curr_x][curr_y].type == MIRROR_LEFT_TO_UP) {
+            int tmp = dir[0];
+            dir[0] = -dir[1];
+            dir[1] = -tmp;
+        } else if (map[curr_x][curr_y].type == MIRROR_LEFT_TO_DOWN) {
+            int tmp = dir[0];
+            dir[0] = dir[1];
+            dir[1] = tmp;
+        } else if (map[curr_x][curr_y].type == SPLITTER_HORIZONTAL && dir[1] != 0) {
+            dir[0] = 1;
+            dir[1] = 0;
+            int recurse_dir[2] = {-1, 0};
+            traverse_light(map, x, y, curr_x, curr_y, recurse_dir);
+        } else if (map[curr_x][curr_y].type == SPLITTER_VERTICAL && dir[0] != 0) {
+            dir[0] = 0;
+            dir[1] = 1;
+            int recurse_dir[2] = {0, -1};
+            traverse_light(map, x, y, curr_x, curr_y, recurse_dir);
+        }
+        curr_direction = dir_to_direction(dir);
+    }
+}
+
+int has_light(tile_t map[LINE_MAX_LENGTH][LINE_MAX_LENGTH], int x, int y, light_direction_t direction, int max_x, int max_y) {
+    if (x < 0 || y < 0 || x > max_x || y > max_y) {
+        return 1;
+    }
+    for (int i = 0; i < map[x][y].lights_num; i++) {
+        if (map[x][y].lights[i] == direction) {
+            return 1;
+        }
+    }
+
+    return 0;
+}
+
+light_direction_t dir_to_direction(int dir[2]) {
+    if (dir[0] == 1) {
+        return LEFT_TO_RIGHT;
+    } else if (dir[0] == -1) {
+        return RIGHT_TO_LEFT;
+    } else if (dir[1] == 1) {
+        return UP_TO_DOWN;
+    }
+    return DOWN_TO_UP;
+}
+
+int count_energized(tile_t map[LINE_MAX_LENGTH][LINE_MAX_LENGTH], int x, int y) {
+    int sum = 0;
+    for (int i = 0; i < y; i++) {
+        for (int j = 0; j < x; j++) {
+            if (map[j][i].lights_num > 0) {
+                sum++;
+            }
+        }
+    }
+
+    return sum;
+}

day16/input.txt

@@ -0,0 +1,110 @@
+\.............\................\....\..../....\/...............................\...-..........-.\.-....../....
+|\......../|....\..............-\............./...........................-..........-......\........\........
+.......||......../....-./.../-...|.|..-......-.|....../................\............|...................-..|..
+........./......-.............-\......................|.\./.......|........./......-......../..-.........|....
+....../....................-............................................../...../...|.........................
+....................\....|/............................./.......-....|......../..........................\....
+.|....../|.........-......|.............\..|..................|......../.................|.|............-.|...
+.....-............\\............\................/......-.........\................\..|../....................
+............|..|.......|......../................\.......................|../....../......./.....|............
+.\...........\..\.............../.........-/....|......................./.....-./-.........../-........-......
+|................\.\-.............../..-............./........./.................\.............|...-.....-....
+.........-....|..|......................................\.||...-../..|............../...../.../.........-.....
+.....-....-\.................|...........|../.....\...............................|...../../|.................
+.\......\......................\....../.../.....-.../.........................../..|...........|..\...........
+-............|.........-.-........-.........................|...\...-...........\.|...-....../..........|.....
+.........-.......|......\.....\..-...../..../.....\.../............/..........-......./....../...........\.../
+..............\........................|.............................-../......-..-...../..................\..
+.....\......-.......-.......-......../../../........\.......-..........|......./........................../...
+.\...\...................|./\|.-..\...............................\..\.....-....|......................./.....
+.................-...|....|.../...../.|.||.....-.|............................-..............\................
+........................................../.......................|........\......../.../..............|.....\
+.......\......./............................./........../../..........................-\..................|...
+...........-...|..\..........-.........\.................././................|./.......|............../.......
+......./..................................\...-.........\........\....../............................\......\-
+-.|..-|...............|..........................\..........|.-.........\............-.|.............\.....|..
+.............................../..............-.....-.......-........................|.......-................
+.........\.........-.........|...../......../......./....-...\...................\........\...................
+..........\.........\........../...|.................|./...\.......\..........-...............................
+./...................|........../\......../....................|..-...........\...\...........|..............|
+.....|...........\-.\.......-..........................-....-...................|....|.|...............-......
+.|.././......................|.......|.......|..............\...../.................../.\...-.................
+...........-........./....|.................|..-.....-............./...................................-..../.
+...................\/..|.....-............../-......-..........|........................./...\....-|....|-....
+........................./..-..|.\-...............-......-/...../.......\..|................-...\.|.....\.....
+\...../.........................../....................-..........|........../..-..-.......\........../.././|.
+........................../...\|..................................................../...|.-........-.....|..\.
+....\.............................|./.....|...../....\.............\...../.......-...............\..-..../....
+.........-.........................|................|........\/.\-...................\..-......./../..........
+...-.../............/.................-..........\....../............../...../..........|.....................
+..........\...\..................|...-......\\......./...-.............-\.................|...../......\......
+/..\/.............\....\.............\.......................................|.....\....-............\........
+....../..\.|................................\.........../.......-.......-/.....|...................-.....-....
+........-....|.............................|....../...............\.......................--..................
+................/......|.........-....................-..............|.......................................|
+.........\........|...........................\.............|.............................../.................
+...|..\....-......../.\...-............................................................/....-...../...........
+.............\\\.../...../.../..........\..............\...........\........................|....../.........\
+......-..............|..-..|....-\..\..-...-............\.................\...-.\/.....\......-.\....--.../...
+........./...................../...../..|...\.\/.........\.../........................................\.../-..
+........\.......|.......|\..|........../..../\........../........\..../..............././..../.............-.\
+........................|-............|............................./.-.|...|............../....-\............
+../........-.../....................|....................-/.............../.....-...........-....\......||....
+.....\..|.....-|../....|./....-|.......-...../..-..\..............\...................../.................|...
+...-......../.\...........\.........\../.....|............\..................../.........\................/.\/
+...../...|............-..\.../............/............-..............--.-..........././............-........|
+.....|...........\.....-...\..../.....-........-.....\.|..............\....-............./...../..............
+....\.....-.|....\..../..............\|../.........../......|....\/.......................|............|....-.
+........|..--..............|..............-........|.......|.-.........\.............-...........\............
+./.||....\......./....\./........../...........././....\.................../..................\...../.........
+.......|..\...-.\..\..|.........../..................................-....|........\......|....|..............
+...|..........|.........-...............|...............................-.......|...........-..\.......\......
+.\.........../../............................-..|...\.....-.........../......-|.../.....|.................-...
+........|....../..\..\|..|......|.........|...............................\../.....\....-/........-...........
+.................................................\.......|........|.\.-....../.......|.......|............\...
+.......|.......\.......|.........|......-......|...|...\.............\.............|/.........................
+..........|....................|..........\..........-......./................................................
+...../.......|....................|......................././.................................................
+........\.............|........--..........\.............../......|...................../............|..\.....
+....-............|.........|....|.-.\../-...\....-...-................\|..\-.......|........-............../..
+................/........\.....\.....././....|....................-...............\...........-......\........
+.\.....|......|...|\......\.\/....\.............-............\.....\.......-...-........-....//..../.....|..-.
+..................|..|.-.................../\...........|..../..........\|.....-..|.../.......................
+-......-......./........./../.............../..................-..\.......\............|...../../....../......
+....../............/...........\.............\............./.........../.......\......|....|.........../......
+...\........|..................|............-............-.....-..\..-................/........../........||..
+......../..|..-../..../......................../.........\./.-................../...................-.........
+.../....|....\.......-..\..........-....\.............|\........../...............-........|..................
+..............\.............\|.........-......................-........\|......./.......-.................|...
+/..../...-||\-...|\...............................\.......................\.............-................-....
+.......-..-....|..................|..............................................................///...-.../.|
+......|.......-/........-.-......|....\..-...|...........\...........\.....................-..../.........../.
+......-...........|-..\.......|...|.\|.................-....\...................\.\........\.\./.........\....
+....../............../.........|...|.......|..../.............................................................
+.........../...................-./...\..........\-............./...........\.../.....|......................-.
+/..../..../........................................|.\......-/......./....\.........................-......|..
+.\./.|.-..........................|...|...........|....../....-....../|...............\..............\...-....
+....|...\..........|......-..................|........../..|.-...\........./........|................|........
+...\....\........../........../.........\..............-...........................-.|...../..........\.......
+...|...........-...........................\........-.........................\...-..-.....\.......|........-.
+......\|...........................\.....................................-............/....\...........|......
+................../............-........................\.................................................-...
+.../....|...............|....................../\.........|....................\....|............\.........|-.
+.......................................|....-.........../....\-........|......./............-..|.............\
+/.........\..\.........|...............\.......\........./................\....................|.....|........
+..................................|.....|.-..|.../......................../-\......|..........................
+.................|.....................................................-............|.....|..../.\/..........|
+.......\....\....-........|.|..../......-......\...../....................-...........\............-..........
+....-.................................-..........-......-................................../.........-\...|...
+.....................|......................|.........-............../.../.....-........\.....................
+.\./..........-.\...\||................./../........\.........|...\........\....\.\...............-|......|...
+..\......//.........../.\........\......|......|........\......\.....-..........|.-..|...../|.................
+/.....................\.................-........|...................\.....-..............-/.....\..|../../...
+...|..-.../............./.|.................../............/..\...........-....|-............\.......--.......
+..............\..\/.....\.........|.\.........................|............|........./................./-..|-.
+...........................-.................../...................|\..........\/..|.-........................
+.....-.............................../....................\.........|......................|..................
+..................\.........../...........\..\/.........|...........|..-........|....\..........-...../.|.....
+..........|.......\..\...........\.../......................-...........-.....-........../\|..................
+....../.......-........................\|...//...\..-......\.......|..\....................-..........\..-....
+|./....|........-./........../.\...\.....|../..../.......-........../.\.....-.................................

day16/sample.txt

@@ -0,0 +1,10 @@
+.|...\....
+|.-.\.....
+.....|-...
+........|.
+..........
+.........\
+..../.\\..
+.-.-/..|..
+.|....-|.\
+..//.|....

day17/c/day17.c

@@ -0,0 +1,185 @@
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+#include <stdint.h>
+
+#define LINE_MAX_LENGTH 256
+#define NUM_0_CHARCODE 48
+#define equal(a,b) ((a)[0] == (b)[0] && (a)[1] == (b)[1])
+#define MAX_NODES 128*1024
+#define MAX_PATH 1024
+#define BIT_0 0x0000001
+#define BIT_1 0x0000002
+#define BIT_2 0x0000004
+#define BIT_3 0x0000008
+
+typedef struct node {
+    int position[2];
+    int weight;
+    int dir[2];
+    int forward_count;
+} node_t;
+
+void insert_to_queue(node_t *nodes, int *nodes_num, node_t node);
+long dir_to_bit(int dir[2]);
+void set_tmp(node_t *tmp, int next_x, int next_y, uint8_t map[LINE_MAX_LENGTH][LINE_MAX_LENGTH], node_t curr, int next_dir[2], int fwd);
+void find_path(node_t *curr, int start[2], int finish[2], uint8_t map[LINE_MAX_LENGTH][LINE_MAX_LENGTH], int x, int y, int min_fwd, int max_fwd);
+
+int main() {
+    char *p, *buf, c;
+
+    buf = (char *)malloc(LINE_MAX_LENGTH);
+    memset(buf, 0, LINE_MAX_LENGTH);
+    p = buf;
+
+    uint8_t map[LINE_MAX_LENGTH][LINE_MAX_LENGTH];
+    memset(map, 0, LINE_MAX_LENGTH * LINE_MAX_LENGTH * sizeof(uint8_t));
+    int x = 0, y = 0;
+
+    while ((c = getchar()) != EOF) {
+        *p++ = c;
+        if (c == '\n') {
+            p = buf;
+            x = 0;
+
+            while (*p != '\n') {
+                map[x][y] = *p - NUM_0_CHARCODE;
+                p++;
+                x++;
+            }
+            y++;
+            memset(buf, 0, LINE_MAX_LENGTH);
+            p = buf;
+        }
+    }
+
+    int start[2] = {0, 0};
+    int finish[2] = {x - 1, y - 1};
+    node_t curr;
+
+    find_path(&curr, start, finish, map, x, y, 0, 3);
+
+    printf("%i\n", curr.weight);
+
+    find_path(&curr, start, finish, map, x, y, 4, 10);
+
+    printf("%i\n", curr.weight);
+
+    free(buf);
+}
+
+void insert_to_queue(node_t *nodes, int *nodes_num, node_t node) {
+    int inserted = 0;
+    for (int i = 0; i < *nodes_num; i++) {
+        if (node.weight < nodes[i].weight) {
+            // Shift to the right
+            for (int j = *nodes_num; j > i; j--) {
+                memcpy(&nodes[j], &nodes[j-1], sizeof(node_t));
+            }
+            memcpy(&nodes[i], &node, sizeof(node_t));
+            inserted = 1;
+            break;
+        }
+    }
+
+    if (!inserted) {
+        memcpy(&nodes[*nodes_num], &node, sizeof(node_t));
+    }
+    (*nodes_num)++;
+}
+
+long dir_to_bit(int dir[2]) {
+    if (dir[0] == 1) {
+        return BIT_0;
+    }
+
+    if (dir[0] == -1) {
+        return BIT_1;
+    }
+
+    if (dir[1] == 1) {
+        return BIT_2;
+    }
+
+    return BIT_3;
+}
+
+void set_tmp(node_t *tmp, int next_x, int next_y, uint8_t map[LINE_MAX_LENGTH][LINE_MAX_LENGTH], node_t curr, int next_dir[2], int fwd) {
+    tmp->position[0] = next_x;
+    tmp->position[1] = next_y;
+    tmp->weight = curr.weight + map[next_x][next_y];
+    tmp->dir[0] = next_dir[0];
+    tmp->dir[1] = next_dir[1];
+    tmp->forward_count = fwd ? curr.forward_count + 1 : 1;
+}
+
+void find_path(node_t *curr, int start[2], int finish[2], uint8_t map[LINE_MAX_LENGTH][LINE_MAX_LENGTH], int x, int y, int min_fwd, int max_fwd) {
+    node_t tmp;
+    tmp.position[0] = start[0];
+    tmp.position[1] = start[1];
+    tmp.weight = 0;
+    tmp.dir[0] = 1;
+    tmp.dir[1] = 0;
+    tmp.forward_count = 1;
+    long visited[LINE_MAX_LENGTH][LINE_MAX_LENGTH];
+    memset(visited, 0, LINE_MAX_LENGTH * LINE_MAX_LENGTH * sizeof(long));
+
+    node_t *nodes = (node_t*)malloc(MAX_NODES * sizeof(node_t));
+    memset(nodes, 0, MAX_NODES * sizeof(node_t));
+    int nodes_num = 1;
+    memcpy(&nodes[0], &tmp, sizeof(node_t));
+    int next_x, next_y, next_dir[2];
+    for (;;) {
+        // Pop first node
+        memcpy(curr, &nodes[0], sizeof(node_t));
+
+        if (equal(curr->position, finish) && curr->forward_count >= min_fwd) {
+            break;
+        }
+        // Shift entries
+        for (int i = 0; i < nodes_num - 1; i++) {
+            memcpy(&nodes[i], &nodes[i+1], sizeof(node_t));
+        }
+        nodes_num--;
+
+        // Check forward direction
+        if (curr->forward_count != max_fwd) {
+            next_dir[0] = curr->dir[0];
+            next_dir[1] = curr->dir[1];
+            next_x = curr->position[0] + next_dir[0];
+            next_y = curr->position[1] + next_dir[1];
+
+            if (next_x >= 0 && next_x < x && next_y >= 0 && next_y < y && !(visited[next_x][next_y] & (dir_to_bit(next_dir) << (curr->forward_count * 4)))) {
+                visited[next_x][next_y] |= (dir_to_bit(next_dir) << (curr->forward_count * 4));
+                set_tmp(&tmp, next_x, next_y, map, *curr, next_dir, 1);
+                insert_to_queue(nodes, &nodes_num, tmp);
+            }
+        }
+
+        next_dir[0] = curr->dir[0] == 0 ? 1 : 0;
+        next_dir[1] = curr->dir[1] == 0 ? 1 : 0;
+        next_x = curr->position[0] + next_dir[0];
+        next_y = curr->position[1] + next_dir[1];
+        if (curr->forward_count >= min_fwd && next_x >= 0 && next_x < x && next_y >= 0 && next_y < y && !(visited[next_x][next_y] & (dir_to_bit(next_dir) << (max_fwd * 4)))) {
+            visited[next_x][next_y] |= (dir_to_bit(next_dir) << (max_fwd * 4));
+            set_tmp(&tmp, next_x, next_y, map, *curr, next_dir, 0);
+            insert_to_queue(nodes, &nodes_num, tmp);
+        }
+
+        next_dir[0] = curr->dir[0] == 0 ? -1 : 0;
+        next_dir[1] = curr->dir[1] == 0 ? -1 : 0;
+        next_x = curr->position[0] + next_dir[0];
+        next_y = curr->position[1] + next_dir[1];
+        if (curr->forward_count >= min_fwd && next_x >= 0 && next_x < x && next_y >= 0 && next_y < y && !(visited[next_x][next_y] & (dir_to_bit(next_dir) << (max_fwd * 4)))) {
+            visited[next_x][next_y] |= (dir_to_bit(next_dir) << (max_fwd * 4));
+            set_tmp(&tmp, next_x, next_y, map, *curr, next_dir, 0);
+            insert_to_queue(nodes, &nodes_num, tmp);
+        }
+
+        if (nodes_num == 0) {
+            printf("No path to end\n");
+            break;
+        }
+    }
+    free(nodes);
+}

day17/input.txt

@@ -0,0 +1,141 @@
+322222331232132221112333141131141421432535111315454231154425333445331325214334352425212345343422113421533234333342231121312224211232132331311
+112222221132312141233334323313423341313142332514144441221332524235451353431144233453551355535521415123254413343222433142441412131232231122221
+233311211132123132221413413342313144254415324345245135411343525533355513313524342444244552154352343444341241224233132212231434412321112213132
+122121222123133442422242231341123325225213254443245241522123133531323555532233151534115233215142445532322342151213321214342313432231323113123
+333221122312222411121442113241232534233432521555121441223215535431542235361313542254543322532531154144522513554533443441341444111111321121333
+211331211214432233123223424223124532151344214214542223331353264642443432464436224423224313223252125355413525423152224342423114131411112111123
+321223112344113433231424123325532125514251543332123251155363265243452334535223565553644354421552113311325513113444511443343413432243231313333
+331112133142443233432421114422112423521245553211111523242563534534562453423253433464252355615233351324133352335421242442142134213132421212232
+123123132324211421233414412211533554345522213452545454536356224246525264445422262363524343225625252212421135334423251133211443213214112122122
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+122323311123331314242221442331134445133211444341324335245235554244244535654565323631324113113435231541311524113422324131342433243442233332323
+131232121222413342213424423134225553425223335324412235455552131523111656231531242452533234455554145512342144111144431122223424423333132222113
+111322123121134213313111224233414112541332235125122353234451522411134512122545415145522212213525144152312255153143114113221323132422321321122
+212133123312121131311312443214311325443433324425455124152235512334253433334522144532143435341332543332153335423423341414241221311221213123233

day17/sample.txt

@@ -0,0 +1,13 @@
+2413432311323
+3215453535623
+3255245654254
+3446585845452
+4546657867536
+1438598798454
+4457876987766
+3637877979653
+4654967986887
+4564679986453
+1224686865563
+2546548887735
+4322674655533

day18/c/day18.c

@@ -0,0 +1,369 @@
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+#include <stdint.h>
+#include <limits.h>
+
+#define LINE_MAX_LENGTH 256
+#define MAX_ENTRIES 2048
+#define MAX_QUEUE_LEN 256
+#define MAX_EDGES 1024
+#define MAX_BREAKPOINTS 512
+#define min(a,b) ((a) < (b) ? (a) : (b))
+#define max(a,b) ((a) > (b) ? (a) : (b))
+
+typedef struct entry {
+    char direction;
+    long long count;
+    char rgb_string[10];
+} entry_t;
+
+typedef struct zone {
+    long long upper_left_corner[2];
+    long long lower_right_corner[2];
+    uint8_t outside;
+} zone_t;
+
+int cmp(const void* a, const void* b);
+int on_edge(long long edges[MAX_EDGES][2][2], int edges_num, long long side[2][2]);
+unsigned long long lake_volume(entry_t entries[], int entries_num);
+void decode_rgbs(entry_t entries[], int entries_num);
+
+int main() {
+    char *p, *buf, c;
+
+    buf = (char *)malloc(LINE_MAX_LENGTH);
+    memset(buf, 0, LINE_MAX_LENGTH);
+    p = buf;
+
+    entry_t entries[MAX_ENTRIES];
+    memset(entries, 0, MAX_ENTRIES * sizeof(entry_t));
+    int entries_num = 0;
+
+    while ((c = getchar()) != EOF) {
+        *p++ = c;
+        if (c == '\n') {
+            sscanf(buf, "%c %lli %s", &entries[entries_num].direction, &entries[entries_num].count, entries[entries_num].rgb_string);
+            entries_num++;
+            memset(buf, 0, LINE_MAX_LENGTH);
+            p = buf;
+        }
+    }
+
+    unsigned long long part1 = lake_volume(entries, entries_num);
+
+    decode_rgbs(entries, entries_num);
+
+    unsigned long long part2 = lake_volume(entries, entries_num);
+
+    printf("%llu\n", part1);
+    printf("%llu\n", part2);
+
+    free(buf);
+}
+
+int cmp(const void* a, const void* b) {
+    return *(long long*)a - *(long long*)b;
+}
+
+int on_edge(long long edges[MAX_EDGES][2][2], int edges_num, long long side[2][2]) {
+    for (int i = 0; i < edges_num; i++) {
+        if (edges[i][0][0] == side[0][0] && edges[i][0][0] == edges[i][1][0] && side[0][0] == side[1][0] && edges[i][0][1] <= side[0][1] && edges[i][1][1] >= side[1][1]) {
+            return 1;
+        }
+        if (edges[i][0][1] == side[0][1] && edges[i][0][1] == edges[i][1][1] && side[0][1] == side[1][1] && edges[i][0][0] <= side[0][0] && edges[i][1][0] >= side[1][0]) {
+            return 1;
+        }
+    }
+
+    return 0;
+}
+
+unsigned long long lake_volume(entry_t entries[], int entries_num) {
+    long long x = 0, y = 0, dir[2];
+
+    long long edges[MAX_EDGES][2][2];
+    memset(edges, 0, MAX_EDGES * 2 * 2 * sizeof(long long));
+    int edges_num = 0;
+
+    for (int i = 0; i < entries_num; i++) {
+        switch (entries[i].direction) {
+            case 'R':
+                dir[0] = 1;
+                dir[1] = 0;
+                edges[edges_num][0][0] = x;
+                edges[edges_num][0][1] = y;
+                edges[edges_num][1][0] = x + entries[i].count * dir[0];
+                edges[edges_num][1][1] = y + entries[i].count * dir[1];
+                edges_num++;
+                break;
+            case 'L':
+                dir[0] = -1;
+                dir[1] = 0;
+                edges[edges_num][1][0] = x;
+                edges[edges_num][1][1] = y;
+                edges[edges_num][0][0] = x + entries[i].count * dir[0];
+                edges[edges_num][0][1] = y + entries[i].count * dir[1];
+                edges_num++;
+                break;
+            case 'U':
+                dir[0] = 0;
+                dir[1] = -1;
+                edges[edges_num][1][0] = x;
+                edges[edges_num][1][1] = y;
+                edges[edges_num][0][0] = x + entries[i].count * dir[0];
+                edges[edges_num][0][1] = y + entries[i].count * dir[1];
+                edges_num++;
+                break;
+            case 'D':
+                dir[0] = 0;
+                dir[1] = 1;
+                edges[edges_num][0][0] = x;
+                edges[edges_num][0][1] = y;
+                edges[edges_num][1][0] = x + entries[i].count * dir[0];
+                edges[edges_num][1][1] = y + entries[i].count * dir[1];
+                edges_num++;
+                break;
+        }
+
+        x += entries[i].count * dir[0];
+        y += entries[i].count * dir[1];
+    }
+
+    // Find smallest and largest x and y
+    long long min_x = LLONG_MAX, max_x = LLONG_MIN, min_y = LLONG_MAX, max_y = LLONG_MIN;
+    for (int i = 0; i < edges_num; i++) {
+        if (edges[i][0][0] < min_x) {
+            min_x = edges[i][0][0];
+        }
+        if (edges[i][1][0] > max_x) {
+            max_x = edges[i][1][0];
+        }
+        if (edges[i][0][1] < min_y) {
+            min_y = edges[i][0][1];
+        }
+        if (edges[i][1][1] > max_y) {
+            max_y = edges[i][1][1];
+        }
+    }
+
+    // X breakpoints
+    long long x_breakpoints[MAX_BREAKPOINTS], x_breakpoints_num = 0;
+    for (int i = 0; i < edges_num; i++) {
+        int found = 0;
+        for (int j = 0; j < x_breakpoints_num; j++) {
+            if (edges[i][0][0] == x_breakpoints[j]) {
+                found = 1;
+                break;
+            }
+        }
+        if (!found) {
+            x_breakpoints[x_breakpoints_num] = edges[i][0][0];
+            x_breakpoints_num++;
+        }
+        found = 0;
+        for (int j = 0; j < x_breakpoints_num; j++) {
+            if (edges[i][1][0] == x_breakpoints[j]) {
+                found = 1;
+                break;
+            }
+        }
+        if (!found) {
+            x_breakpoints[x_breakpoints_num] = edges[i][1][0];
+            x_breakpoints_num++;
+        }
+    }
+    qsort(x_breakpoints, x_breakpoints_num, sizeof(x_breakpoints[0]), &cmp);
+
+    // Y breakpoints
+    long long y_breakpoints[MAX_BREAKPOINTS], y_breakpoints_num = 0;
+    for (int i = 0; i < edges_num; i++) {
+        int found = 0;
+        for (int j = 0; j < y_breakpoints_num; j++) {
+            if (edges[i][0][1] == y_breakpoints[j]) {
+                found = 1;
+                break;
+            }
+        }
+        if (!found) {
+            y_breakpoints[y_breakpoints_num] = edges[i][0][1];
+            y_breakpoints_num++;
+        }
+        found = 0;
+        for (int j = 0; j < y_breakpoints_num; j++) {
+            if (edges[i][1][1] == y_breakpoints[j]) {
+                found = 1;
+                break;
+            }
+        }
+        if (!found) {
+            y_breakpoints[y_breakpoints_num] = edges[i][1][1];
+            y_breakpoints_num++;
+        }
+    }
+    qsort(y_breakpoints, y_breakpoints_num, sizeof(y_breakpoints[0]), &cmp);
+
+    zone_t **zones = (zone_t**)malloc((x_breakpoints_num - 1) * sizeof(zone_t*));
+    for (int i = 0; i < x_breakpoints_num - 1; i++) {
+        zones[i] = (zone_t*)malloc((y_breakpoints_num - 1) * sizeof(zone_t));
+        memset(zones[i], 0, (y_breakpoints_num - 1) * sizeof(zone_t));
+    }
+    zone_t *curr;
+
+    for (int i = 0; i < y_breakpoints_num - 1; i++) {
+        for (int j = 0; j < x_breakpoints_num - 1; j++) {
+            curr = &zones[j][i];
+            curr->upper_left_corner[0] = x_breakpoints[j];
+            curr->upper_left_corner[1] = y_breakpoints[i];
+            curr->lower_right_corner[0] = x_breakpoints[j + 1];
+            curr->lower_right_corner[1] = y_breakpoints[i + 1];
+        }
+    }
+
+    // Mark zones as outside
+    int found = 1;
+    while (found) {
+        found = 0;
+        for (int i = 0; i < y_breakpoints_num - 1; i++) {
+            for (int j = 0; j < x_breakpoints_num - 1; j++) {
+                if (zones[j][i].outside) {
+                    continue;
+                }
+                // LEFT
+                long long side[2][2];
+                side[0][0] = zones[j][i].upper_left_corner[0];
+                side[0][1] = zones[j][i].upper_left_corner[1];
+                side[1][0] = zones[j][i].upper_left_corner[0];
+                side[1][1] = zones[j][i].lower_right_corner[1];
+                if (j == 0 && !on_edge(edges, edges_num, side)) {
+                    zones[j][i].outside = 1;
+                    found = 1;
+                }
+                if (j > 0 && zones[j-1][i].outside && !on_edge(edges, edges_num, side)) {
+                    zones[j][i].outside = 1;
+                    found = 1;
+                }
+                // RIGHT
+                side[0][0] = zones[j][i].lower_right_corner[0];
+                side[0][1] = zones[j][i].upper_left_corner[1];
+                side[1][0] = zones[j][i].lower_right_corner[0];
+                side[1][1] = zones[j][i].lower_right_corner[1];
+                if (j == x_breakpoints_num - 2 && !on_edge(edges, edges_num, side)) {
+                    zones[j][i].outside = 1;
+                    found = 1;
+                }
+                if (j < x_breakpoints_num - 2 && zones[j+1][i].outside && !on_edge(edges, edges_num, side)) {
+                    zones[j][i].outside = 1;
+                    found = 1;
+                }
+                // UP
+                side[0][0] = zones[j][i].upper_left_corner[0];
+                side[0][1] = zones[j][i].upper_left_corner[1];
+                side[1][0] = zones[j][i].lower_right_corner[0];
+                side[1][1] = zones[j][i].upper_left_corner[1];
+                if (i == 0 && !on_edge(edges, edges_num, side)) {
+                    zones[j][i].outside = 1;
+                    found = 1;
+                }
+                if (i > 0 && zones[j][i-1].outside && !on_edge(edges, edges_num, side)) {
+                    zones[j][i].outside = 1;
+                    found = 1;
+                }
+                // DOWN
+                side[0][0] = zones[j][i].upper_left_corner[0];
+                side[0][1] = zones[j][i].lower_right_corner[1];
+                side[1][0] = zones[j][i].lower_right_corner[0];
+                side[1][1] = zones[j][i].lower_right_corner[1];
+                if (i == y_breakpoints_num - 2 && !on_edge(edges, edges_num, side)) {
+                    zones[j][i].outside = 1;
+                    found = 1;
+                }
+                if (i < y_breakpoints_num - 2 && zones[j][i+1].outside && !on_edge(edges, edges_num, side)) {
+                    zones[j][i].outside = 1;
+                    found = 1;
+                }
+            }
+        }
+    }
+
+    unsigned long long sum = 0;
+    unsigned long long out = 0;
+    for (int i = 0; i < y_breakpoints_num - 1; i++) {
+        for (int j = 0; j < x_breakpoints_num - 1; j++) {
+            if (zones[j][i].outside) {
+                out++;
+            }
+        }
+    }
+
+    for (int i = 0; i < y_breakpoints_num - 1; i++) {
+        for (int j = 0; j < x_breakpoints_num - 1; j++) {
+            if (zones[j][i].outside) {
+                continue;
+            }
+            sum += (zones[j][i].lower_right_corner[0] - zones[j][i].upper_left_corner[0] - 1) * (zones[j][i].lower_right_corner[1] - zones[j][i].upper_left_corner[1] - 1);
+            // RIGHT
+            long long side[2][2];
+            side[0][0] = zones[j][i].lower_right_corner[0];
+            side[0][1] = zones[j][i].upper_left_corner[1];
+            side[1][0] = zones[j][i].lower_right_corner[0];
+            side[1][1] = zones[j][i].lower_right_corner[1];
+            if (!on_edge(edges, edges_num, side)) {
+                sum += side[1][1] - side[0][1] - 1;
+            }
+            // DOWN
+            side[0][1] = zones[j][i].lower_right_corner[1];
+            side[0][0] = zones[j][i].upper_left_corner[0];
+            side[1][0] = zones[j][i].lower_right_corner[0];
+            side[1][1] = zones[j][i].lower_right_corner[1];
+            if (!on_edge(edges, edges_num, side)) {
+                sum += side[1][0] - side[0][0] - 1;
+            }
+            // CORNER
+            side[0][1] = zones[j][i].lower_right_corner[1];
+            side[0][0] = zones[j][i].lower_right_corner[0];
+            side[1][0] = zones[j][i].lower_right_corner[0];
+            side[1][1] = zones[j][i].lower_right_corner[1];
+            if (!on_edge(edges, edges_num, side)) {
+                sum++;
+            }
+        }
+    }
+
+    for (int i = 0; i < edges_num; i++) {
+        sum += (edges[i][1][0] - edges[i][0][0]) + (edges[i][1][1] - edges[i][0][1]);
+    }
+
+    for (int i = 0; i < x_breakpoints_num - 1; i++) {
+        free(zones[i]);
+    }
+    free(zones);
+
+    return sum;
+}
+
+void decode_rgbs(entry_t entries[], int entries_num) {
+    for (int i = 0; i < entries_num; i++) {
+        char value[6], *p;
+        memset(value, 0, 6);
+        p = entries[i].rgb_string;
+        while(*p != '#') p++;
+        p++;
+        strncpy(value, p, 5);
+        sscanf(value, "%llx", &entries[i].count);
+        switch(entries[i].rgb_string[7]) {
+            case '0':
+                entries[i].direction = 'R';
+                break;
+            case '1':
+                entries[i].direction = 'D';
+                break;
+            case '2':
+                entries[i].direction = 'L';
+                break;
+            case '3':
+                entries[i].direction = 'U';
+                break;
+        }
+    }
+}

day18/input.txt

@@ -0,0 +1,660 @@
+L 3 (#07b412)
+D 5 (#713ad1)
+L 2 (#11e6d2)
+D 4 (#6ba7d3)
+L 3 (#7cfca2)
+U 5 (#0a85c3)
+L 2 (#3a5282)
+U 4 (#6f91a3)
+L 3 (#32c2f0)
+U 6 (#2dd7b3)
+L 6 (#848c30)
+U 7 (#077a43)
+R 5 (#ba4692)
+U 6 (#49b551)
+R 3 (#14d162)
+U 8 (#397871)
+R 5 (#1c73f2)
+D 8 (#7130e1)
+R 4 (#c84852)
+U 2 (#203b91)
+R 3 (#288e30)
+U 5 (#91ba91)
+R 4 (#5dda70)
+U 3 (#91ba93)
+R 4 (#732500)
+U 4 (#0676f1)
+L 9 (#6701a2)
+U 4 (#5c38c1)
+L 7 (#0f7480)
+U 4 (#921b21)
+L 6 (#83d9e0)
+U 2 (#28c691)
+L 7 (#1b6de0)
+U 2 (#02cee1)
+L 4 (#5b66b0)
+U 4 (#bdb093)
+L 6 (#75eb20)
+U 4 (#928251)
+L 4 (#6bb430)
+D 7 (#44ad91)
+L 2 (#806b50)
+U 7 (#7d1391)
+L 4 (#7a3652)
+U 5 (#9cbf41)
+L 5 (#905712)
+U 2 (#70beb3)
+L 2 (#bede02)
+U 7 (#70beb1)
+R 3 (#a2c232)
+U 5 (#7b0ad1)
+R 5 (#01d012)
+U 5 (#2b1901)
+R 7 (#698c32)
+U 4 (#a19d91)
+R 4 (#7dbb92)
+U 3 (#8feb41)
+R 5 (#021ab2)
+U 3 (#42a773)
+R 6 (#99c6c2)
+D 7 (#8f7b33)
+R 5 (#01fd82)
+D 5 (#8e7263)
+R 2 (#37e492)
+U 5 (#10bff3)
+R 5 (#a09242)
+U 7 (#126723)
+R 3 (#864230)
+D 8 (#70bc43)
+R 5 (#7cf4a0)
+D 2 (#8135d3)
+R 6 (#144b70)
+U 5 (#0c51e3)
+L 6 (#00e590)
+U 4 (#44ba73)
+L 2 (#4177e2)
+U 4 (#a4c5b1)
+L 6 (#6f2f12)
+U 3 (#9a4ce1)
+L 4 (#979402)
+D 7 (#2a0ce1)
+L 3 (#0c1b70)
+U 7 (#58ca71)
+L 3 (#95d640)
+U 4 (#549241)
+R 10 (#a1f1b2)
+U 3 (#1753b1)
+L 5 (#1d32d2)
+U 5 (#9a58d3)
+L 5 (#4dc1b2)
+U 6 (#1ab693)
+L 4 (#5e8df2)
+U 3 (#4dabf3)
+R 6 (#972492)
+U 5 (#3198c3)
+R 4 (#972490)
+U 3 (#54b613)
+R 6 (#4a8bb2)
+U 2 (#a4c5b3)
+R 3 (#126042)
+U 9 (#54acc3)
+L 5 (#2b4682)
+U 4 (#88f453)
+L 4 (#2b4680)
+U 8 (#4a4283)
+L 2 (#8bfdf0)
+U 2 (#a76851)
+L 4 (#0a9b30)
+U 6 (#43a141)
+L 3 (#14fd80)
+U 3 (#7e5391)
+L 6 (#43ba40)
+D 2 (#146e93)
+L 4 (#9c71b0)
+D 7 (#5ae483)
+L 5 (#0bcd70)
+U 6 (#52a1c3)
+L 4 (#3307f0)
+U 4 (#1da3f3)
+L 3 (#7a8c80)
+D 5 (#89c463)
+L 2 (#2984e0)
+D 2 (#828673)
+L 6 (#2cf252)
+U 7 (#500061)
+L 4 (#a07ff2)
+U 3 (#565f21)
+R 3 (#09ef22)
+U 3 (#a65f83)
+R 5 (#410672)
+U 4 (#24fe73)
+L 5 (#b6ed72)
+U 8 (#4574d3)
+L 6 (#2e3142)
+D 8 (#7ba311)
+L 3 (#1bc442)
+U 6 (#38b161)
+L 4 (#8ada92)
+U 2 (#24cdf1)
+L 3 (#37b3e2)
+U 3 (#3a3ec1)
+R 5 (#242ea2)
+U 2 (#1fe073)
+R 5 (#9ad182)
+U 6 (#4a9193)
+R 6 (#34c480)
+U 2 (#9ff123)
+R 5 (#34c482)
+U 4 (#08fe03)
+R 3 (#46d292)
+D 10 (#19fca3)
+R 3 (#1ea7d2)
+D 6 (#c2d531)
+R 8 (#614f82)
+D 6 (#c2d533)
+R 6 (#777202)
+D 2 (#38f573)
+R 3 (#84e142)
+D 3 (#036d11)
+R 5 (#113352)
+D 5 (#036d13)
+R 3 (#7ad752)
+U 4 (#969de3)
+R 7 (#7887d0)
+U 3 (#31aa61)
+R 4 (#affca0)
+U 6 (#31aa63)
+R 2 (#374010)
+U 6 (#574d53)
+L 4 (#4edbd2)
+U 2 (#2271c1)
+L 7 (#595d32)
+U 3 (#2271c3)
+R 3 (#2c6532)
+U 5 (#2754d3)
+R 8 (#8b2652)
+U 4 (#b27ab3)
+R 6 (#824b80)
+D 4 (#587173)
+R 4 (#3715b0)
+D 5 (#8f0b61)
+R 3 (#6a2ac0)
+D 3 (#1e0b21)
+R 5 (#29a290)
+D 3 (#8850b3)
+R 5 (#9013e0)
+D 3 (#24c5d3)
+R 5 (#2b12d0)
+U 6 (#4090a3)
+R 3 (#9cddd0)
+D 6 (#a93843)
+R 4 (#6fff30)
+D 4 (#3f1121)
+L 7 (#76f2c0)
+D 4 (#4f9e11)
+L 3 (#76f2c2)
+D 8 (#480d31)
+L 6 (#694740)
+D 5 (#177e81)
+L 9 (#692aa2)
+D 3 (#10b971)
+R 9 (#42f012)
+D 3 (#10b973)
+R 3 (#2c6202)
+D 8 (#851881)
+R 3 (#04ae62)
+D 2 (#470d81)
+R 4 (#155e10)
+U 3 (#01b053)
+R 2 (#c55dd0)
+U 5 (#01b051)
+R 9 (#026f30)
+D 2 (#113081)
+R 2 (#694742)
+D 4 (#22d821)
+L 5 (#03eb80)
+D 5 (#3bc5d1)
+L 4 (#69bf90)
+D 3 (#3fdce3)
+L 4 (#2d1350)
+D 2 (#3fdce1)
+L 3 (#65f500)
+U 4 (#bd7f81)
+L 8 (#8382e0)
+D 4 (#160053)
+L 7 (#5ff9f0)
+D 4 (#ab40d3)
+R 6 (#5ff9f2)
+D 2 (#58d1b3)
+R 2 (#6bcc80)
+D 6 (#b187c3)
+R 6 (#73b290)
+D 3 (#9fbf43)
+R 4 (#630f00)
+D 2 (#4f1b13)
+R 7 (#543b30)
+D 7 (#114c43)
+R 6 (#629ac0)
+D 6 (#1bedb3)
+R 4 (#016f50)
+D 2 (#285e31)
+R 3 (#611460)
+D 7 (#0dfd61)
+R 2 (#75f3e0)
+D 2 (#1e79b1)
+R 4 (#144e90)
+U 5 (#d16ff1)
+R 4 (#144e92)
+U 6 (#113511)
+R 5 (#610450)
+U 3 (#1291c1)
+R 2 (#328eb0)
+U 5 (#2f3f73)
+R 9 (#126af2)
+U 4 (#946843)
+L 6 (#126af0)
+U 5 (#866453)
+L 7 (#352e70)
+U 4 (#5f8413)
+L 7 (#c618e2)
+U 3 (#6c2813)
+L 2 (#c618e0)
+U 3 (#1d3db3)
+R 8 (#37e470)
+U 2 (#1705b3)
+R 6 (#6ab412)
+U 6 (#961873)
+R 3 (#6ab410)
+U 8 (#30e6f3)
+R 5 (#3308e0)
+U 3 (#1fc8c1)
+R 3 (#3450a0)
+D 8 (#9d4391)
+R 3 (#6a9c70)
+D 2 (#25d071)
+R 4 (#3e5330)
+D 6 (#401381)
+R 5 (#399052)
+D 3 (#ab9e81)
+R 4 (#2622a2)
+D 4 (#68c4c3)
+R 4 (#2c5f92)
+D 3 (#8021d3)
+R 5 (#75bd02)
+D 3 (#1885a1)
+R 3 (#67b420)
+D 3 (#7df001)
+R 6 (#67b422)
+D 2 (#5270f1)
+R 3 (#2bbed2)
+D 9 (#863371)
+L 3 (#45ba70)
+D 6 (#49f553)
+L 2 (#693800)
+D 6 (#49f551)
+L 7 (#450b90)
+D 7 (#3b7aa1)
+R 5 (#399050)
+D 2 (#0b37f1)
+R 4 (#5cbff0)
+U 4 (#573103)
+R 3 (#3668c0)
+U 9 (#573101)
+R 4 (#7d0a50)
+U 7 (#316341)
+R 3 (#4cbab0)
+U 8 (#5c0f21)
+R 3 (#22b3a2)
+U 3 (#804941)
+R 4 (#22b3a0)
+U 7 (#173641)
+R 5 (#1b7230)
+U 3 (#8a0511)
+R 4 (#1a5f82)
+D 5 (#52eda1)
+R 4 (#1a5f80)
+U 5 (#38db21)
+R 5 (#2f4720)
+U 2 (#2a75c1)
+R 9 (#aa4d40)
+U 3 (#538141)
+L 3 (#7ad770)
+U 5 (#66ec01)
+L 5 (#53e812)
+U 3 (#539a81)
+L 4 (#53e810)
+U 5 (#413821)
+L 5 (#618330)
+D 5 (#a4bf71)
+L 6 (#56e4b2)
+U 3 (#acf591)
+L 2 (#890732)
+U 8 (#2a62d1)
+R 4 (#458e22)
+U 5 (#2ef8e3)
+R 4 (#273c60)
+U 4 (#439bc3)
+R 2 (#273c62)
+D 4 (#64c3c3)
+R 5 (#0e0c12)
+D 5 (#9481d1)
+R 3 (#5321d2)
+U 4 (#5d6361)
+R 7 (#531760)
+U 7 (#068711)
+R 7 (#216570)
+U 7 (#a20e51)
+L 3 (#216572)
+D 3 (#46afb1)
+L 8 (#4e8f70)
+D 6 (#1261b1)
+L 5 (#3840e0)
+U 6 (#7b0901)
+L 3 (#75cf00)
+U 3 (#b56e51)
+L 7 (#43b850)
+U 3 (#01dfc1)
+L 6 (#067e40)
+U 7 (#613913)
+R 5 (#30ff10)
+U 7 (#285d33)
+R 5 (#72e5c0)
+D 7 (#285d31)
+R 3 (#3fdcf0)
+U 6 (#601d03)
+R 4 (#312812)
+U 4 (#4ea643)
+R 6 (#8253e2)
+D 7 (#4ea641)
+R 2 (#3045d2)
+U 7 (#8362b3)
+R 7 (#631a70)
+U 4 (#ba56c3)
+R 6 (#28e520)
+U 2 (#568a53)
+R 3 (#c1d452)
+U 2 (#3e2a33)
+R 5 (#c1d450)
+U 5 (#0f6e43)
+R 4 (#c65ae0)
+U 3 (#790e83)
+R 2 (#012b40)
+U 7 (#2ea6b3)
+R 4 (#358722)
+D 2 (#7b3bf3)
+R 6 (#adbd32)
+D 4 (#4f7b63)
+R 5 (#0d26f2)
+U 5 (#47f363)
+R 2 (#4c6160)
+D 5 (#70ff63)
+R 5 (#284290)
+D 3 (#231103)
+L 7 (#540e80)
+D 2 (#8b51b3)
+L 5 (#662c40)
+D 4 (#22e7e3)
+R 7 (#1d46a0)
+D 3 (#343a43)
+L 6 (#4d7d90)
+D 4 (#31a643)
+L 10 (#4e6b30)
+U 4 (#31a641)
+L 4 (#5abc90)
+D 3 (#799953)
+L 4 (#9e4ed0)
+D 5 (#3b73e3)
+R 7 (#390760)
+D 3 (#bd3533)
+L 7 (#390762)
+D 5 (#075bd3)
+L 3 (#1b7350)
+D 3 (#a01d23)
+R 4 (#a56752)
+D 2 (#6a4313)
+R 5 (#529462)
+D 4 (#843c43)
+R 4 (#829482)
+U 4 (#7914e3)
+R 3 (#2f0b90)
+U 7 (#5f3d53)
+R 6 (#114980)
+D 7 (#60b7e3)
+R 4 (#b9b2f0)
+D 4 (#60b7e1)
+R 5 (#2143f0)
+D 3 (#2f86d3)
+L 7 (#5f4440)
+D 4 (#366293)
+L 5 (#5baae0)
+U 8 (#80a9a3)
+L 3 (#61f680)
+D 8 (#80a9a1)
+L 5 (#8bdce0)
+U 4 (#46e4d1)
+L 5 (#120950)
+D 8 (#7c15b1)
+L 4 (#641450)
+D 2 (#047bf1)
+L 2 (#3b00c0)
+D 7 (#a18c33)
+L 3 (#543b70)
+D 2 (#a18c31)
+L 7 (#466150)
+D 4 (#5c3ad1)
+R 4 (#5caa80)
+D 2 (#230201)
+R 6 (#955102)
+D 6 (#b200c1)
+R 7 (#955100)
+D 3 (#1d8ff1)
+R 3 (#26f9d0)
+D 8 (#160d71)
+R 2 (#483920)
+D 4 (#4577c3)
+R 8 (#92ef90)
+D 5 (#a57e83)
+R 7 (#0715a0)
+D 3 (#1da9e3)
+L 2 (#627970)
+D 6 (#573ee1)
+L 8 (#006f30)
+D 4 (#735da1)
+L 4 (#006f32)
+D 4 (#266951)
+R 3 (#9745a0)
+D 6 (#412bb1)
+R 7 (#83f8f2)
+D 2 (#6c4d31)
+R 4 (#6a7e72)
+D 3 (#578921)
+L 7 (#6c5d92)
+D 2 (#5485c1)
+L 5 (#300852)
+D 4 (#cdf091)
+L 2 (#544dd2)
+D 3 (#1259f1)
+L 7 (#882292)
+D 6 (#03e4b1)
+R 7 (#cdf192)
+D 3 (#5f3c41)
+R 4 (#c836b0)
+D 5 (#4cfdc1)
+L 2 (#36a590)
+D 4 (#244753)
+L 2 (#73bd60)
+D 3 (#244751)
+L 7 (#72cc90)
+U 4 (#0e0d21)
+L 5 (#21ce60)
+D 4 (#523dd1)
+L 9 (#041252)
+D 3 (#8cfc81)
+R 5 (#041250)
+D 5 (#365031)
+R 6 (#21ce62)
+U 5 (#17b3e1)
+R 5 (#75a900)
+D 3 (#8d4fe1)
+R 4 (#75a902)
+D 3 (#342091)
+R 5 (#8d5570)
+D 5 (#a6f9a3)
+R 5 (#59f560)
+D 4 (#49ae63)
+R 5 (#59f562)
+D 5 (#2dc6c3)
+R 4 (#8fb550)
+U 6 (#884bf3)
+R 3 (#17ea50)
+U 4 (#560143)
+R 5 (#623ad0)
+D 8 (#5dfc41)
+R 5 (#ca0040)
+D 2 (#5bc201)
+R 4 (#ca0042)
+D 3 (#7008b1)
+R 7 (#b87530)
+U 4 (#5e8821)
+R 4 (#817080)
+U 7 (#69e951)
+R 2 (#518e30)
+U 4 (#0e9831)
+R 5 (#29ea82)
+D 4 (#26f041)
+R 9 (#6a1862)
+D 4 (#8d3971)
+L 4 (#6a1860)
+D 4 (#215e71)
+L 5 (#29ea80)
+D 3 (#282e61)
+R 3 (#bc6172)
+D 8 (#17c4f1)
+L 6 (#1abf10)
+U 5 (#1a15e1)
+L 3 (#2ed960)
+D 5 (#24f4f3)
+L 4 (#9d6b00)
+D 6 (#24f4f1)
+L 2 (#704c40)
+D 4 (#45b0c1)
+L 5 (#93a182)
+D 6 (#53b3b1)
+L 5 (#5f72d2)
+U 6 (#76a9f1)
+L 4 (#643b62)
+D 3 (#3f41f1)
+L 6 (#691122)
+D 2 (#606491)
+L 5 (#4c5b02)
+D 5 (#6d1fa1)
+L 2 (#bf6472)
+D 6 (#6d1fa3)
+L 6 (#989bb2)
+U 4 (#606493)
+L 3 (#348412)
+U 6 (#9e4561)
+L 4 (#9b1742)
+U 8 (#42a901)
+L 5 (#09f8f2)
+U 3 (#63a8c3)
+R 8 (#591640)
+U 4 (#2dcda3)
+L 8 (#591642)
+U 4 (#4f7803)
+L 2 (#3e5fe2)
+U 5 (#0b9e93)
+L 3 (#cae6b2)
+U 4 (#7399f3)
+L 7 (#28c482)
+U 6 (#d2ee83)
+L 3 (#28c480)
+U 6 (#2f0423)
+L 3 (#320f52)
+U 2 (#5f4ab1)
+L 4 (#8d6672)
+U 6 (#b09261)
+L 6 (#718952)
+D 8 (#750591)
+L 4 (#33df82)
+D 5 (#1052a1)
+L 4 (#9a90e2)
+U 6 (#8eb861)
+L 2 (#0c1e92)
+U 4 (#53b871)
+L 4 (#0739f2)
+U 4 (#76cfb1)
+L 6 (#9b6922)
+U 7 (#76cfb3)
+L 5 (#846eb2)
+D 4 (#53b873)
+L 3 (#6b7ae2)
+D 4 (#59dd21)
+L 2 (#60b0b2)
+D 6 (#a53b01)
+R 5 (#767632)
+D 4 (#6c6bb1)
+L 4 (#b3a932)
+D 3 (#0660a1)
+L 5 (#12b390)
+U 4 (#9c9d01)
+L 4 (#12b392)
+U 3 (#910691)
+L 4 (#8dec12)
+U 6 (#65ba53)
+L 3 (#1e02b2)
+U 2 (#b05803)
+L 2 (#1e02b0)
+U 8 (#8a5d93)
+L 2 (#3bea42)
+U 5 (#032da3)
+R 8 (#0aabc2)
+U 3 (#4a0a13)
+L 8 (#9f1c02)
+U 4 (#58a0f3)
+L 3 (#9f1c00)
+D 3 (#3a2cf3)
+L 7 (#169b22)
+D 2 (#004253)
+L 2 (#841fd2)
+D 9 (#0b8473)
+L 4 (#3f85a2)
+D 6 (#134bd3)
+L 2 (#17f832)
+D 5 (#8870f3)
+L 2 (#87cf62)
+D 3 (#8b9fa3)
+L 2 (#6ca082)
+D 3 (#9a6ea3)
+L 7 (#60cbc2)
+D 4 (#9a6ea1)
+L 2 (#296752)
+D 3 (#b0d5c3)
+L 8 (#0e0100)
+D 5 (#218503)
+L 6 (#36a620)
+D 7 (#071463)
+L 3 (#669dd0)
+D 3 (#3099a1)
+L 7 (#385d40)
+D 5 (#3099a3)
+L 7 (#3c66b0)
+D 3 (#8fec33)
+L 2 (#4ce142)
+D 4 (#4b7051)
+L 8 (#55b322)
+D 3 (#4b7053)
+L 7 (#38cd62)
+D 3 (#668b13)
+L 4 (#36a622)
+D 2 (#581f83)
+L 4 (#0e0102)
+D 7 (#356bd3)
+L 5 (#3eb472)
+D 3 (#4ca003)
+L 3 (#6afe62)
+D 5 (#4ca001)
+L 5 (#536dd2)
+U 8 (#978bb3)
+L 5 (#6118d2)
+U 7 (#aec403)

day18/sample.txt

@@ -0,0 +1,14 @@
+R 6 (#70c710)
+D 5 (#0dc571)
+L 2 (#5713f0)
+D 2 (#d2c081)
+R 2 (#59c680)
+D 2 (#411b91)
+L 5 (#8ceee2)
+U 2 (#caa173)
+L 1 (#1b58a2)
+U 2 (#caa171)
+R 2 (#7807d2)
+U 3 (#a77fa3)
+L 2 (#015232)
+U 2 (#7a21e3)

day19/c/day19.c

@@ -0,0 +1,303 @@
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+
+#define LINE_MAX_LENGTH 256
+#define MAX_INSTRUCTIONS 16
+#define MAX_WORKFLOWS 1024
+#define MAX_PARTS 2048
+#define NUM_0_CHARCODE 48
+#define NUM_9_CHARCODE NUM_0_CHARCODE + 9
+#define MAX_BREAKPOINTS 1024
+
+typedef struct instruction {
+    char category;
+    char operator;
+    int value;
+    char destination[16];
+    int destination_length;
+} instruction_t;
+
+typedef struct workflow {
+    char name[16];
+    int name_length;
+    instruction_t instructions[MAX_INSTRUCTIONS];
+    int instructions_num;
+    char default_action[16];
+    int default_action_length;
+} workflow_t;
+
+typedef struct part {
+    int x;
+    int m;
+    int a;
+    int s;
+} part_t;
+
+typedef struct breakpoints {
+    int x[MAX_BREAKPOINTS];
+    int x_num;
+    int m[MAX_BREAKPOINTS];
+    int m_num;
+    int a[MAX_BREAKPOINTS];
+    int a_num;
+    int s[MAX_BREAKPOINTS];
+    int s_num;
+} breakpoints_t;
+
+int cmp(const void *a, const void *b);
+char get_workflow_result(workflow_t workflows[], int workflows_num, part_t part, workflow_t in);
+
+int main() {
+    char *p, *q, *buf, c;
+
+    buf = (char *)malloc(LINE_MAX_LENGTH);
+    memset(buf, 0, LINE_MAX_LENGTH);
+    p = buf;
+
+    int first = 1;
+    workflow_t *workflows = (workflow_t*)malloc(MAX_WORKFLOWS * sizeof(workflow_t));
+    memset(workflows, 0, MAX_WORKFLOWS * sizeof(workflow_t));
+    int workflows_num = 0;
+
+    part_t *parts = (part_t*)malloc(MAX_PARTS * sizeof(part_t));
+    memset(parts, 0, MAX_PARTS * sizeof(part_t));
+    int parts_num = 0;
+
+    while ((c = getchar()) != EOF) {
+        *p++ = c;
+        if (c == '\n') {
+            if (buf[0] == '\n') {
+                first = 0;
+            } else {
+                p = buf;
+                if (first) {
+                    while (*p != '{') p++;
+                    strncpy(workflows[workflows_num].name, buf, p - buf);
+                    workflows[workflows_num].name_length = p - buf;
+                    p++;
+                    while(*p != '\n') {
+                        q = p;
+                        while(*p != '<' && *p != '>' && *p != '}') p++;
+                        // Default action
+                        if (*p == '}') {
+                            strncpy(workflows[workflows_num].default_action, q, p - q);
+                            workflows[workflows_num].default_action_length = p - q;
+                        } else {
+                            workflows[workflows_num].instructions[workflows[workflows_num].instructions_num].category = *q;
+                            workflows[workflows_num].instructions[workflows[workflows_num].instructions_num].operator = *p;
+                            p++;
+                            sscanf(p, "%i", &workflows[workflows_num].instructions[workflows[workflows_num].instructions_num].value);
+                            while (*p != ':') p++;
+                            p++;
+                            q = p;
+                            while (*p != ',') p++;
+                            strncpy(workflows[workflows_num].instructions[workflows[workflows_num].instructions_num].destination, q, p - q);
+                            workflows[workflows_num].instructions[workflows[workflows_num].instructions_num].destination_length = p - q;
+                            workflows[workflows_num].instructions_num++;
+                        }
+                        p++;
+                    }
+                    workflows_num++;
+                } else {
+                    while (*p < NUM_0_CHARCODE || *p > NUM_9_CHARCODE) p++;
+                    sscanf(p, "%i", &parts[parts_num].x);
+                    while (*p != ',') p++;
+                    while (*p < NUM_0_CHARCODE || *p > NUM_9_CHARCODE) p++;
+                    sscanf(p, "%i", &parts[parts_num].m);
+                    while (*p != ',') p++;
+                    while (*p < NUM_0_CHARCODE || *p > NUM_9_CHARCODE) p++;
+                    sscanf(p, "%i", &parts[parts_num].a);
+                    while (*p != ',') p++;
+                    while (*p < NUM_0_CHARCODE || *p > NUM_9_CHARCODE) p++;
+                    sscanf(p, "%i", &parts[parts_num].s);
+                    parts_num++;
+                }
+            }
+            memset(buf, 0, LINE_MAX_LENGTH);
+            p = buf;
+        }
+    }
+
+    // Find start
+    workflow_t *start;
+    for (int i = 0; i < workflows_num; i++) {
+        if (!strcmp(workflows[i].name, "in")) {
+            start = &workflows[i];
+            break;
+        }
+    }
+
+    int part1 = 0;
+    for (int i = 0; i < parts_num; i++) {
+        char result = get_workflow_result(workflows, workflows_num, parts[i], *start);
+        if (result == 'A') {
+            part1 += parts[i].x + parts[i].m + parts[i].a + parts[i].s;
+        }
+    }
+
+    printf("%i\n", part1);
+
+    breakpoints_t breakpoints;
+    memset(&breakpoints, 0, sizeof(breakpoints_t));
+
+    for (int i = 0; i < workflows_num; i++) {
+        for (int j = 0; j < workflows[i].instructions_num; j++) {
+            if (workflows[i].instructions[j].category == 'x') {
+                int value = workflows[i].instructions[j].operator == '<' ? workflows[i].instructions[j].value : workflows[i].instructions[j].value + 1;
+                int found = 0;
+                for (int k = 0; k < breakpoints.x_num; k++) {
+                    if (breakpoints.x[k] == value) {
+                        found = 1;
+                        break;
+                    }
+                }
+                if (!found) {
+                    breakpoints.x[breakpoints.x_num] = value;
+                    breakpoints.x_num++;
+                }
+            }
+            if (workflows[i].instructions[j].category == 'm') {
+                int value = workflows[i].instructions[j].operator == '<' ? workflows[i].instructions[j].value  : workflows[i].instructions[j].value + 1;
+                int found = 0;
+                for (int k = 0; k < breakpoints.m_num; k++) {
+                    if (breakpoints.m[k] == value) {
+                        found = 1;
+                        break;
+                    }
+                }
+                if (!found) {
+                    breakpoints.m[breakpoints.m_num] = value;
+                    breakpoints.m_num++;
+                }
+            }
+            if (workflows[i].instructions[j].category == 'a') {
+                int value = workflows[i].instructions[j].operator == '<' ? workflows[i].instructions[j].value : workflows[i].instructions[j].value + 1;
+                int found = 0;
+                for (int k = 0; k < breakpoints.a_num; k++) {
+                    if (breakpoints.a[k] == value) {
+                        found = 1;
+                        break;
+                    }
+                }
+                if (!found) {
+                    breakpoints.a[breakpoints.a_num] = value;
+                    breakpoints.a_num++;
+                }
+            }
+            if (workflows[i].instructions[j].category == 's') {
+                int value = workflows[i].instructions[j].operator == '<' ? workflows[i].instructions[j].value : workflows[i].instructions[j].value + 1;
+                int found = 0;
+                for (int k = 0; k < breakpoints.s_num; k++) {
+                    if (breakpoints.s[k] == value) {
+                        found = 1;
+                        break;
+                    }
+                }
+                if (!found) {
+                    breakpoints.s[breakpoints.s_num] = value;
+                    breakpoints.s_num++;
+                }
+            }
+        }
+    }
+    qsort(breakpoints.x, breakpoints.x_num, sizeof(breakpoints.x[0]), &cmp);
+    qsort(breakpoints.m, breakpoints.m_num, sizeof(breakpoints.m[0]), &cmp);
+    qsort(breakpoints.a, breakpoints.a_num, sizeof(breakpoints.a[0]), &cmp);
+    qsort(breakpoints.s, breakpoints.s_num, sizeof(breakpoints.s[0]), &cmp);
+
+    double part2 = 0;
+#pragma omp parallel for schedule(dynamic)
+    for (int i = 0; i < breakpoints.x_num + 1; i++) {
+        for (int j = 0; j < breakpoints.m_num + 1; j++) {
+            for (int k = 0; k < breakpoints.a_num + 1; k++) {
+                for (int l = 0; l < breakpoints.s_num + 1; l++) {
+                    unsigned long x0 = i == 0 ? 1 : breakpoints.x[i - 1];
+                    unsigned long x1 = i == breakpoints.x_num ? 4001 : breakpoints.x[i];
+                    unsigned long m0 = j == 0 ? 1 : breakpoints.m[j - 1];
+                    unsigned long m1 = j == breakpoints.m_num ? 4001 : breakpoints.m[j];
+                    unsigned long a0 = k == 0 ? 1 : breakpoints.a[k - 1];
+                    unsigned long a1 = k == breakpoints.a_num ? 4001 : breakpoints.a[k];
+                    unsigned long s0 = l == 0 ? 1 : breakpoints.s[l - 1];
+                    unsigned long s1 = l == breakpoints.s_num ? 4001 : breakpoints.s[l];
+                    part_t metapart = {
+                        .x = x0,
+                        .m = m0,
+                        .a = a0,
+                        .s = s0,
+                    };
+                    char result = get_workflow_result(workflows, workflows_num, metapart, *start);
+#pragma omp critical
+                    if (result == 'A') {
+                        part2 += (double)(x1 - x0) * (double)(m1 - m0) * (double)(a1 - a0) * (double)(s1 - s0);
+                    }
+                }
+            }
+        }
+    }
+
+    printf("%f\n", part2);
+
+    free(buf);
+    free(workflows);
+}
+
+int cmp(const void *a, const void *b) {
+    return *(int*)a - *(int*)b;
+}
+
+char get_workflow_result(workflow_t workflows[], int workflows_num, part_t part, workflow_t in) {
+    for (int i = 0; i < in.instructions_num; i++) {
+        int value;
+        switch (in.instructions[i].category) {
+            case 'x':
+                value = part.x;
+                break;
+            case 'm':
+                value = part.m;
+                break;
+            case 'a':
+                value = part.a;
+                break;
+            case 's':
+                value = part.s;
+                break;
+        }
+        int matches;
+        switch (in.instructions[i].operator) {
+            case '<':
+                matches = value < in.instructions[i].value;
+                break;
+            case '>':
+                matches = value > in.instructions[i].value;
+                break;
+        }
+        if (matches) {
+            if (!strcmp(in.instructions[i].destination, "A")) {
+                return 'A';
+            }
+            if (!strcmp(in.instructions[i].destination, "R")) {
+                return 'R';
+            }
+            for (int j = 0; j < workflows_num; j++) {
+                if (!strcmp(workflows[j].name, in.instructions[i].destination)) {
+                    return get_workflow_result(workflows, workflows_num, part, workflows[j]);
+                }
+            }
+        }
+    }
+
+    if (!strcmp(in.default_action, "A")) {
+        return 'A';
+    }
+    if (!strcmp(in.default_action, "R")) {
+        return 'R';
+    }
+    for (int i = 0; i < workflows_num; i++) {
+        if (!strcmp(workflows[i].name, in.default_action)) {
+            return get_workflow_result(workflows, workflows_num, part, workflows[i]);
+        }
+    }
+
+    return 'F';
+}

day19/input.txt

@@ -0,0 +1,769 @@
+mxf{m<2310:phv,zs}
+zjr{s>1167:zqt,skq}
+hm{x>2975:rkl,x>2818:vhs,a>1062:bkc,kjg}
+dkl{m>2321:ctj,x>3530:A,gj}
+zk{s<1218:R,A}
+zkd{m>864:A,a>488:R,jcp}
+zdl{m>3429:A,m>2961:R,R}
+xmd{a<576:A,a<1045:R,a<1386:R,A}
+kzz{m>1106:R,a<508:R,x>2970:A,R}
+gdr{x<139:R,x<183:A,s<222:A,R}
+rb{m<3239:R,a<3546:A,A}
+xns{x<621:vrz,gm}
+nd{s>2927:xnx,x<3488:A,a<434:pg,A}
+fl{s<3624:qg,m>952:qf,kjt}
+vhm{x<3815:R,s>1774:A,m>643:R,A}
+krp{a<2439:R,m>298:R,x<1440:R,R}
+njj{x<2856:cjc,x<2936:R,a>598:R,kzz}
+jp{m>1745:R,x<1239:A,a<625:lt,qbq}
+rhd{a<3515:R,a<3543:A,s<3959:R,R}
+htm{a>284:R,m<1961:R,s<2226:R,A}
+kjj{a>704:fcn,s<439:lq,R}
+jkk{s>1376:R,a<341:A,A}
+jt{s<3384:A,x<3143:R,xgd}
+bcm{a<1408:R,m<425:R,A}
+hc{s>1126:A,m>1159:A,R}
+jff{a>3411:A,s<804:jn,A}
+knh{s>2643:szq,A}
+klj{x>1392:A,a<2628:R,R}
+kfx{a>1268:R,A}
+cxd{a>1275:A,s>1768:R,R}
+clq{a>1293:R,x>3243:R,R}
+mpc{a<2362:R,R}
+ng{a>578:A,x>1430:A,R}
+hh{a>2697:A,s<1336:R,a<2167:A,A}
+cjc{a<661:R,s>1113:A,x<2787:A,A}
+fgv{m>3553:R,m<3400:A,m>3492:A,A}
+pqk{m<110:R,A}
+zqt{m<1713:mg,s>1555:jfx,s<1309:zm,A}
+jrz{a<665:nh,tgp}
+vsf{s<2496:R,R}
+xdc{a>2214:R,A}
+kkm{s>3217:A,x<3895:R,a<857:A,R}
+sbh{s>1082:ct,sgx}
+kcn{x<3313:A,x<3389:mmt,phd}
+sgg{a<817:rf,s>2209:nhz,R}
+jd{s>2746:R,a>2645:R,R}
+pb{x>2553:A,qb}
+hq{a<1200:A,a<1322:A,m<968:R,R}
+kfz{x<3631:A,R}
+fvf{a>917:drd,s>3325:qt,kcn}
+ctj{m>2668:R,A}
+tbl{x>2400:ql,m<2122:cs,m>2504:rq,tpp}
+kn{m<1806:R,a<588:R,x>3133:R,A}
+sv{a<1325:R,a>1460:R,m>1718:R,A}
+rkl{x>3112:A,s>3342:R,R}
+mg{m>1291:R,A}
+tm{x>1917:bs,A}
+rkq{a<2465:bxc,x>1862:nxc,sp}
+tk{a<1228:A,a<1455:R,A}
+vts{s>3466:jq,xns}
+nh{x<2134:rr,x<2484:pbv,m<976:lvp,mv}
+sz{x<3075:R,m>359:R,R}
+btr{x>3197:qkh,ph}
+ff{m>1946:A,s<2407:zc,A}
+cmk{s>2606:R,A}
+jr{a>804:A,a<475:R,R}
+rf{x<415:A,s>2228:R,a<735:R,R}
+drd{s>3365:tk,s<3276:bcm,A}
+hvq{s<2401:hsn,s>3374:fl,xdl}
+vpn{s<1325:fvm,m<689:R,R}
+vj{s<1347:A,x>673:R,R}
+tnz{s>999:A,x>2657:gk,A}
+rft{a<401:pqp,qdm}
+gkm{m>430:A,m>196:A,s>3374:R,A}
+vhs{m>623:R,R}
+zzt{x>3410:A,m>2991:R,m<2312:A,A}
+pth{x<3816:A,s>3893:A,R}
+vmd{s>3539:zr,gr}
+dlh{x<3015:R,A}
+lv{a<2026:A,m<292:R,x>588:R,A}
+pr{x>3172:rjk,a<1192:R,m<595:A,A}
+dzq{a<812:bgx,s>1212:nhn,nnd}
+kxf{x>3058:R,A}
+tgp{a>1311:kkg,a>960:jx,hmf}
+npv{s<668:A,x>1167:A,R}
+pd{a<1327:A,a<1446:rp,R}
+krf{m>228:A,A}
+cg{m<3308:nr,a>1054:fxs,cgf}
+qd{a>2742:qmb,x>1719:mt,s>818:nrs,mpc}
+bsc{x>1586:R,a<1207:R,R}
+kcb{a<1236:A,s<1368:A,A}
+mf{a<2852:zv,m<2664:prx,rb}
+pnj{a<754:R,rcb}
+zr{x>1721:A,x>683:R,x>265:R,A}
+bn{s>1397:A,a<219:R,R}
+hx{a>953:A,a>428:A,x>539:R,R}
+jv{s<837:pr,fsl}
+qmb{s<1185:R,A}
+zcf{x>784:A,R}
+jpf{s<2409:A,s<2671:A,x<1126:A,R}
+kj{a>836:jv,x>3467:tjj,rl}
+cnc{s<3455:A,s<3662:R,a>1191:A,R}
+vbg{s>2501:R,x<3479:xhj,x>3748:R,R}
+in{a>1666:mb,x<1861:dql,sl}
+xg{x<749:dgs,A}
+pj{m<830:R,R}
+jb{m>3287:A,m>3057:gfh,A}
+zdp{a>3403:R,a>3071:R,m>808:R,A}
+ggc{x>1433:A,s>2595:R,R}
+pxr{s<3463:R,m<792:R,A}
+lk{x<724:R,s<3706:A,trm}
+mjv{s<3762:A,bxn}
+hl{a>556:ks,s<2836:A,m<1771:kc,kjd}
+gf{x>1994:R,m<3457:xkg,s>3446:R,A}
+bxz{m<718:R,A}
+bv{s<2868:ggc,R}
+pg{a<269:A,x>3764:R,m>3066:R,R}
+vxn{s>1686:R,a>1312:R,m<2228:A,A}
+jj{a>673:A,R}
+zsx{x>3204:R,A}
+cs{s<1229:A,R}
+qdm{a<550:A,m>833:R,A}
+vkl{s>365:A,x<236:gdr,s<161:zt,vxr}
+cb{x<1464:A,x<1513:R,m<1814:R,R}
+fn{m>2717:A,s>3698:A,R}
+jzq{x>330:A,m>2865:R,A}
+gn{a<1001:A,R}
+cvv{m>817:fr,x<1974:mrv,m<316:vd,kh}
+spl{a<1511:R,A}
+qg{a<3083:csf,a>3444:mz,vmd}
+tf{x>3535:R,a<669:gxm,s>2146:clq,A}
+sg{s<463:lx,s<936:tq,R}
+pnb{s<1080:R,m<3125:A,m<3446:A,R}
+phd{x<3427:A,R}
+hmf{a>804:gsn,s<1343:btv,vsf}
+cdj{a>358:mdl,a<238:A,nk}
+xs{x>2559:A,m>1333:A,A}
+phv{m<2219:R,m<2257:R,x<565:A,A}
+rx{s<2069:nvr,m>2736:qr,R}
+vld{x>969:A,s>1063:A,m<689:R,A}
+drn{s>1516:kx,m<611:kbn,jff}
+jlg{s<2849:tgr,qlb}
+nrn{a<1365:xmh,a>1565:A,x<1595:R,fgv}
+fx{x>3184:R,a<1161:R,x<2964:A,R}
+nfm{m<3293:R,m<3660:A,A}
+cft{a<735:A,a>1165:jdq,m<1013:ctl,xdg}
+grs{x<630:chb,bp}
+tsq{s<3424:klj,s>3632:rkq,tj}
+ll{a<566:R,R}
+zc{m<1722:A,x>1506:A,x>1464:R,A}
+tmx{s>3389:A,x>2770:A,R}
+jdq{s>1592:A,R}
+hhb{m<728:R,s<3217:bf,kfz}
+chb{s>1613:A,A}
+zcv{m<1690:A,a>1254:cb,R}
+gdt{s<2338:R,a>529:R,A}
+lrd{s>1816:A,s<1737:R,x>3648:vhm,mxs}
+dl{s>1645:A,A}
+rdr{m<3263:lmt,nrn}
+dbp{x>1326:R,A}
+vr{m<2215:R,A}
+dqb{m>1367:A,s>3854:A,A}
+mj{x<3291:xmd,m<1474:A,x>3594:fp,mk}
+cvq{s<3167:vz,x>3484:dzt,m>1895:qsk,dj}
+hrq{m>912:zn,s<2570:pk,x<3198:A,A}
+tq{m<525:A,A}
+cx{s>971:xbb,a>2286:R,s>558:lv,R}
+vlz{s<432:bdx,m>419:R,m<201:fh,cm}
+hsm{x>3894:psb,s>3500:A,zh}
+pmv{m>1260:xn,x<1634:tkk,A}
+mt{m<3482:lps,R}
+qs{x>214:R,m<2255:A,A}
+pf{m>399:R,x>3064:R,R}
+fd{s>3477:A,R}
+cmp{a>553:A,R}
+gbx{s>657:R,m>939:A,m<824:A,A}
+hsn{a>2953:drn,m>656:kzh,x<1575:xm,vpx}
+vmr{a<696:A,m>594:R,s<2925:A,R}
+hv{m>2584:R,m>2556:A,R}
+gq{m<3154:A,x>3367:hmd,rsn}
+tpc{x>3467:A,m>1865:A,m<1087:R,R}
+vf{x>567:A,R}
+xq{s>2490:ll,jj}
+dx{m<213:mx,x<981:qtt,a<1191:A,ktx}
+sq{s<518:jtt,a<1365:fbb,spl}
+ds{m<1024:R,x<1332:A,A}
+nn{m<337:srx,tx}
+xf{a>645:cnc,R}
+ltv{m<3188:cp,pt}
+gjp{a<3444:R,A}
+tbx{a>2651:bv,zx}
+qf{a<3156:cmf,s>3778:gkk,x<1377:lk,jqq}
+qdf{m>3031:A,s>3921:cqp,fg}
+zx{s>2703:R,s<2561:gts,a>2305:A,snk}
+xlj{a<240:R,R}
+rl{x>3006:cdj,a>458:njj,vpn}
+psq{a>939:tnp,m<1665:mnk,rpj}
+bc{a<486:knh,m<3114:gth,lcr}
+zq{x<1396:R,x<1668:A,R}
+xm{x<973:cx,llb}
+fzx{x>1946:A,x>1916:A,s>2523:dgq,bz}
+gr{s<3443:A,R}
+rsh{m<2322:A,R}
+lzn{m<3606:A,m<3836:vql,a<423:R,R}
+rsn{s<2344:A,a>1284:A,m<3610:A,A}
+rg{m<752:A,s<3018:A,s<3072:R,R}
+drs{a>2000:A,A}
+ctl{s<1467:R,x>675:R,a<885:R,A}
+fvm{a>168:A,s>868:R,R}
+mtn{a>310:R,R}
+rbt{x>3216:R,A}
+dzt{m<1618:prn,zxd}
+cp{x>616:A,m<2469:qs,R}
+zkk{a>806:R,s<1275:A,a>636:A,R}
+jrp{a>1285:A,A}
+crv{m>183:R,x>1678:mbr,A}
+mk{m>2781:R,x<3408:R,x<3508:A,A}
+qvp{x<2839:R,s>2645:A,R}
+tj{m>3041:jxs,m<2346:R,A}
+gj{s<1310:R,R}
+dd{a>700:dx,s<1439:xg,rfd}
+ptj{m>919:cft,a<819:bq,grs}
+qbq{a>1005:A,x>1477:A,A}
+nmh{a>884:R,a>308:R,s<2046:R,hnp}
+lx{a<901:A,m>593:R,R}
+pqd{x>1493:A,x<1235:A,A}
+bnh{m<1280:R,s<3302:R,R}
+tv{a<332:zg,gdt}
+rnd{a<1518:R,a>1596:A,A}
+jlb{a>2132:R,s>736:R,x<1111:A,R}
+mmz{x>992:R,a<1403:R,x<929:A,R}
+qfp{m>1069:R,A}
+pt{s>1650:vf,s>1452:R,x<446:A,vj}
+tkk{s<1160:A,m>1174:R,a<673:R,A}
+kx{x>2642:R,s<1888:A,R}
+dq{x<1992:sc,x>2131:mjs,cmp}
+xbb{s>1608:A,a<2166:A,s<1285:R,A}
+btv{s>646:R,A}
+br{a<1023:kxf,sds}
+nr{m>2923:R,s>3647:R,m>2756:R,R}
+nhn{x<1067:ltv,rdr}
+mbr{x>3214:A,A}
+mrv{m>400:R,m<212:A,A}
+vpx{a>2478:tnz,s>821:nn,a<2119:vlz,vkv}
+hn{x>2956:A,A}
+jz{a<775:R,A}
+pqp{m>731:A,A}
+gbf{a>1519:pvj,m>715:gbx,rm}
+mz{m>549:R,x<2243:krf,a>3781:R,jm}
+gth{m>2216:brs,m>1852:xxk,a>662:R,A}
+bmn{s<892:A,R}
+pgh{s<2509:A,m<3134:R,R}
+kqd{s<2377:A,A}
+nhq{x>538:A,s<315:R,m<296:R,R}
+zhr{m>2625:kqd,tp}
+nrt{s<1274:A,x<1313:A,A}
+mp{a>2286:jd,psr}
+zn{m>1099:A,R}
+vkv{m>221:pf,s<542:qm,m<110:A,A}
+xdl{a<2851:nqc,s<2936:cvv,x>1808:kp,km}
+kfs{a>1392:bcv,s>2659:A,R}
+rcl{s>3400:R,m<528:A,R}
+fsl{s>1571:cxd,m>988:jrp,A}
+bd{m<486:R,R}
+sr{x<445:A,zdl}
+qt{s<3423:gkm,x<3311:A,m>745:R,bqz}
+zfp{x>1123:nqq,A}
+gbd{a>1434:A,x<2274:A,m>947:R,R}
+kbn{x<1675:R,sz}
+mb{m<1446:hvq,ch}
+bcg{a>2036:A,a<1912:A,R}
+mv{s<2113:jkk,s>2853:fd,xs}
+dgq{a<1317:R,m>2464:R,m<2017:A,A}
+dt{s<2641:R,m<702:A,R}
+stf{m<199:A,R}
+sh{m>261:R,a<915:A,R}
+dv{a>2613:A,R}
+zd{a<554:cdx,a<841:kjj,x<798:mlm,sg}
+jn{a<3252:A,x<2123:R,A}
+lvp{a>277:A,nf}
+fh{m>123:R,A}
+lt{x>1632:R,s<654:R,a<325:R,R}
+lcr{a<720:A,m>3584:A,R}
+jfx{s>1699:R,x>616:A,A}
+hg{s<2617:xmj,a<850:R,s>2800:A,A}
+vpd{m<2602:R,a<1388:R,x<2900:rnd,A}
+mc{x<1595:A,x<1769:R,x>1809:A,A}
+hnq{x>2458:A,s<1704:R,A}
+bp{x<1089:A,x<1479:A,R}
+lps{x>2602:R,A}
+gmh{m<2825:R,A}
+dmp{a<1343:dl,x<2089:A,x>2165:A,R}
+bbg{x<415:A,m<580:A,a>1069:mdk,nj}
+qlb{m<838:nl,m<1169:pq,x<799:pl,dxj}
+ms{s<3815:hn,a<1068:lqt,qdf}
+lh{s<885:vkl,m>1432:pn,a>1109:pd,vb}
+fg{s<3875:R,m<2292:A,x>2987:A,R}
+sgx{x>2162:R,x>2109:A,R}
+fb{x>2219:bc,sx}
+gh{a<2425:R,R}
+zj{s<1096:xlj,R}
+rc{a>1099:R,m>1634:jpf,x<1066:A,R}
+lxp{a>1410:tpc,s>2961:qgx,R}
+rsc{m<134:A,m>220:A,R}
+xr{s<789:pj,m>812:hq,s<967:xvt,vld}
+jq{a<892:zcf,m<3084:fn,R}
+jx{m<668:bzx,a>1083:R,A}
+ft{s>2537:R,x>3546:R,x>3014:A,pgh}
+db{a<998:R,s<1612:R,x>2784:A,R}
+vd{s>2660:pqk,a<3336:rsc,a>3760:hvb,A}
+cn{s>2852:R,m>2099:rsh,dxk}
+tjz{x<3743:R,s>3348:ssv,s>3252:R,kkm}
+nlt{a<205:R,x>1400:R,a<276:A,A}
+xvt{m>687:R,x<799:A,A}
+hp{m>1850:hg,m<1700:rc,s>2663:hl,jr}
+kch{m>1902:A,R}
+llb{s<1505:R,x<1208:R,x>1337:krp,R}
+tmk{x<647:tcj,x<1410:hp,x>1663:xq,cgj}
+psj{x<2003:hnh,R}
+szq{x<2455:A,x>2571:R,R}
+nxc{s<3784:A,s<3926:A,x>3006:A,A}
+ph{x>2866:ts,ngq}
+zh{a>920:A,R}
+md{x>809:hf,x<467:lh,zjr}
+kd{a<1002:jt,x<3170:vpd,pfg}
+sc{x<1928:A,a<406:R,m>2129:R,A}
+vg{a<2146:R,m<798:R,s>1349:R,A}
+clg{s<1574:A,A}
+gd{a<1867:R,s>1838:R,m>3359:R,A}
+dxk{a<463:A,s<2763:R,s<2797:R,R}
+prx{a>3468:vk,m<2059:rbt,x>3171:hk,qvp}
+fcn{x<1040:R,s>626:R,x<1572:A,A}
+srx{m>147:R,m<80:A,R}
+dzv{x>2236:zhr,a<1268:zll,tt}
+bx{s>2165:A,x<3424:A,s<2155:A,R}
+sx{m<2846:dq,s<2128:mq,s>3114:gf,lzn}
+mmt{m>667:R,R}
+zll{s>2412:sfz,x>2017:sbh,tm}
+hnp{s>2072:R,R}
+pl{x>413:R,m<1336:R,x<211:R,jz}
+dr{a>1530:R,A}
+qzf{s>2145:bx,a<1033:R,kfx}
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+{x=771,m=479,a=107,s=2259}
+{x=1364,m=166,a=27,s=664}
+{x=774,m=303,a=909,s=93}
+{x=264,m=164,a=3471,s=176}
+{x=681,m=2247,a=1660,s=837}
+{x=1348,m=204,a=990,s=219}
+{x=650,m=1469,a=1269,s=1160}
+{x=1121,m=534,a=2270,s=927}
+{x=322,m=1871,a=693,s=170}
+{x=540,m=462,a=929,s=99}
+{x=3015,m=915,a=808,s=3661}
+{x=248,m=383,a=471,s=106}
+{x=1536,m=1350,a=2067,s=804}
+{x=1656,m=56,a=1629,s=995}
+{x=17,m=236,a=288,s=218}
+{x=663,m=1611,a=317,s=1272}
+{x=630,m=2397,a=1538,s=805}
+{x=211,m=2,a=137,s=514}
+{x=2340,m=191,a=173,s=618}
+{x=2154,m=6,a=42,s=884}
+{x=526,m=1292,a=694,s=1722}
+{x=606,m=355,a=1532,s=1351}
+{x=1405,m=543,a=126,s=3}
+{x=548,m=429,a=1382,s=572}
+{x=95,m=1008,a=1790,s=42}
+{x=1796,m=1272,a=188,s=201}
+{x=1437,m=3161,a=754,s=4}
+{x=891,m=447,a=1389,s=145}
+{x=183,m=894,a=821,s=1455}
+{x=457,m=79,a=1586,s=1179}
+{x=1631,m=828,a=2697,s=73}
+{x=56,m=506,a=1988,s=448}
+{x=3408,m=971,a=2130,s=1899}
+{x=347,m=1915,a=193,s=1460}
+{x=308,m=3,a=1189,s=191}
+{x=2,m=354,a=2761,s=287}
+{x=634,m=864,a=101,s=233}
+{x=632,m=91,a=1935,s=202}
+{x=27,m=1364,a=2765,s=2}
+{x=367,m=510,a=473,s=132}
+{x=987,m=2516,a=1834,s=1121}
+{x=626,m=845,a=176,s=265}
+{x=577,m=823,a=2129,s=23}
+{x=802,m=295,a=389,s=226}
+{x=844,m=301,a=549,s=126}
+{x=1139,m=235,a=9,s=1183}
+{x=663,m=2444,a=554,s=1516}
+{x=1244,m=355,a=252,s=1023}
+{x=151,m=2238,a=392,s=93}
+{x=99,m=1911,a=362,s=1272}
+{x=71,m=146,a=46,s=1359}
+{x=1140,m=650,a=75,s=1458}

day19/sample.txt

@@ -0,0 +1,17 @@
+px{a<2006:qkq,m>2090:A,rfg}
+pv{a>1716:R,A}
+lnx{m>1548:A,A}
+rfg{s<537:gd,x>2440:R,A}
+qs{s>3448:A,lnx}
+qkq{x<1416:A,crn}
+crn{x>2662:A,R}
+in{s<1351:px,qqz}
+qqz{s>2770:qs,m<1801:hdj,R}
+gd{a>3333:R,R}
+hdj{m>838:A,pv}
+
+{x=787,m=2655,a=1222,s=2876}
+{x=1679,m=44,a=2067,s=496}
+{x=2036,m=264,a=79,s=2244}
+{x=2461,m=1339,a=466,s=291}
+{x=2127,m=1623,a=2188,s=1013}

day2/c/day2.c

@@ -0,0 +1,75 @@
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+
+#define LINE_MAX_LENGTH 256
+
+#define RED_CUBES 12
+#define GREEN_CUBES 13
+#define BLUE_CUBES 14
+#define max(a, b) (a > b ? a : b)
+
+int main() {
+    char *p, *buf, c;
+    int sum = 0, id = 0, count = 0;
+    unsigned int part2_sum = 0;
+
+    buf = (char *)malloc(LINE_MAX_LENGTH);
+    memset(buf, 0, LINE_MAX_LENGTH);
+    p = buf;
+
+    while ((c = getchar()) != EOF) {
+        *p++ = c;
+        if (c == '\n') {
+            int possible = 1;
+            int r = 0, g = 0, b = 0;
+            p = buf;
+            // Read Game ID
+            sscanf(p, "Game %i", &id);
+            // Move to char ':'
+            while (*p++ != ':');
+
+            // Read draws
+            for (;;) {
+                sscanf(p, "%i %c", &count, &c);
+
+                if ((c == 'r' && count > RED_CUBES) || (c == 'g' && count > GREEN_CUBES) || (c == 'b' && count > BLUE_CUBES)) {
+                    possible = 0;
+                }
+
+                switch (c) {
+                    case 'r':
+                        r = max(r, count);
+                        break;
+                    case 'g':
+                        g = max(g, count);
+                        break;
+                    case 'b':
+                        b = max(b, count);
+                        break;
+                }
+                // Read to next separator or end of line
+                while (*p != '\n' && *p != ',' && *p != ';') p++;
+
+                if (*p == '\n') {
+                    break;
+                }
+
+                p+=2;
+            }
+
+            if (possible) {
+                sum += id;
+            }
+
+            part2_sum += r * g * b;
+
+            memset(buf, 0, LINE_MAX_LENGTH);
+            p = buf;
+        }
+    }
+
+    free(buf);
+    printf("%i\n", sum);
+    printf("%u\n", part2_sum);
+}

day2/input.txt

@@ -0,0 +1,100 @@
+Game 1: 1 red, 5 blue, 1 green; 16 blue, 3 red; 6 blue, 5 red; 4 red, 7 blue, 1 green
+Game 2: 4 blue; 4 red, 3 blue, 1 green; 4 red, 9 blue, 2 green; 5 blue, 7 green, 4 red
+Game 3: 10 blue; 7 blue, 1 green; 19 blue, 1 green, 9 red
+Game 4: 2 green; 14 blue, 14 red, 4 green; 12 red, 11 green, 13 blue; 5 green, 9 red, 4 blue; 9 red, 7 green, 12 blue; 2 green, 3 blue, 8 red
+Game 5: 3 blue, 4 red; 12 red, 2 green, 15 blue; 1 red, 10 blue, 1 green
+Game 6: 1 blue, 7 red; 3 green, 5 red, 1 blue; 1 green, 7 red; 6 red, 1 blue, 4 green; 1 green, 8 red, 1 blue; 2 green, 4 red, 1 blue
+Game 7: 11 green, 10 blue, 2 red; 1 green, 12 blue, 2 red; 9 green, 14 blue; 1 red, 19 blue, 15 green
+Game 8: 4 green, 2 red, 14 blue; 9 green, 1 red, 15 blue; 2 green, 9 red, 8 blue; 11 green, 7 red, 8 blue; 9 red, 7 green, 6 blue
+Game 9: 4 blue, 1 green, 2 red; 1 blue, 3 red; 1 red, 3 blue, 3 green
+Game 10: 4 red, 3 green, 6 blue; 2 green, 15 blue, 6 red; 3 green, 2 blue; 2 red, 1 green; 11 blue, 7 red, 4 green; 2 blue, 2 red, 4 green
+Game 11: 10 red, 1 green, 7 blue; 5 red, 2 green, 7 blue; 2 green, 4 blue; 1 green, 10 red, 10 blue; 8 blue, 4 red
+Game 12: 6 green, 2 blue, 7 red; 3 green, 2 blue, 3 red; 6 red, 1 blue, 9 green; 9 green, 13 red, 5 blue; 6 green, 4 blue, 8 red
+Game 13: 10 green, 4 red, 6 blue; 19 red, 6 green, 7 blue; 6 blue, 5 red, 8 green
+Game 14: 4 blue, 2 green; 19 blue; 6 red, 17 blue; 10 blue, 7 red; 1 green, 2 blue, 7 red
+Game 15: 4 green, 12 blue, 15 red; 10 blue, 18 green, 13 red; 20 blue, 6 green, 10 red; 20 red, 12 blue, 13 green; 12 blue, 17 green, 10 red; 1 red, 3 blue, 7 green
+Game 16: 1 blue, 6 red, 5 green; 3 red, 3 green; 5 green, 1 red; 2 red, 1 blue, 6 green; 1 blue, 1 red, 6 green; 1 blue, 6 green
+Game 17: 4 red, 3 blue, 3 green; 8 blue, 8 green; 5 red, 3 green, 9 blue; 9 green, 12 blue, 13 red; 1 green, 1 blue, 5 red; 7 green, 6 red
+Game 18: 2 green, 11 blue, 6 red; 2 green, 11 red, 2 blue; 7 red, 4 blue, 9 green; 18 blue, 6 red, 1 green
+Game 19: 4 red, 7 green, 17 blue; 5 green, 6 red, 4 blue; 4 blue, 4 red, 1 green
+Game 20: 2 blue, 5 green, 9 red; 4 green, 8 red, 10 blue; 7 blue, 9 red, 1 green; 1 green, 10 blue, 9 red; 1 green, 8 red; 8 blue, 8 red, 1 green
+Game 21: 1 blue, 14 red; 1 green, 2 red; 9 red, 1 blue, 1 green
+Game 22: 7 green, 9 red, 4 blue; 9 red, 7 green, 9 blue; 8 green, 14 red; 5 blue; 10 red, 1 blue, 1 green; 8 green
+Game 23: 2 red, 12 green, 5 blue; 3 red, 5 blue, 3 green; 1 red, 9 green, 1 blue; 8 green, 6 blue; 13 green
+Game 24: 8 red, 7 green, 1 blue; 1 red, 6 green, 7 blue; 1 green, 3 red
+Game 25: 4 green, 2 red; 1 red, 2 green, 8 blue; 1 green; 8 blue
+Game 26: 1 green, 4 blue, 17 red; 15 red, 3 green, 3 blue; 2 blue, 2 red; 18 red, 2 green, 11 blue; 6 red, 7 blue; 10 blue, 1 green, 4 red
+Game 27: 2 red, 5 blue, 1 green; 14 green, 2 red, 6 blue; 1 red, 4 blue, 14 green
+Game 28: 3 red, 5 green, 2 blue; 2 red, 3 green, 4 blue; 1 red, 9 green, 3 blue; 13 green, 4 red, 4 blue
+Game 29: 18 red, 11 green; 4 blue, 18 red, 9 green; 16 red, 2 green, 4 blue; 2 red, 3 blue, 12 green; 1 green, 18 red; 2 blue, 15 green, 1 red
+Game 30: 10 red, 3 blue, 1 green; 6 red, 1 blue, 3 green; 2 green, 2 blue, 10 red; 6 green; 3 blue, 15 red
+Game 31: 1 blue, 7 green, 2 red; 12 red, 8 green, 4 blue; 2 green, 2 blue, 5 red; 2 blue, 3 green, 12 red; 7 red, 5 green, 4 blue; 7 red, 1 blue
+Game 32: 4 blue, 5 red, 11 green; 20 red, 8 green, 1 blue; 10 red, 7 green, 1 blue; 1 blue, 7 red, 2 green; 1 red, 19 green, 3 blue
+Game 33: 9 red; 9 red, 6 green, 7 blue; 5 red, 7 blue, 2 green
+Game 34: 5 green, 5 red, 3 blue; 8 green, 6 blue, 16 red; 12 blue, 8 red, 8 green; 1 blue, 10 red, 3 green; 1 green, 13 blue, 18 red; 4 blue, 5 green, 8 red
+Game 35: 15 green, 4 red, 8 blue; 7 red, 1 green, 14 blue; 12 green, 16 blue, 2 red
+Game 36: 3 blue, 3 green, 2 red; 7 red, 8 blue; 11 blue, 9 red; 4 red, 13 blue, 1 green
+Game 37: 4 red, 11 blue, 8 green; 6 green, 4 blue, 14 red; 5 blue, 7 green, 13 red; 6 red, 2 green, 5 blue; 4 red, 3 blue, 1 green; 6 red, 4 green, 6 blue
+Game 38: 10 green, 5 blue, 1 red; 3 red, 6 blue, 3 green; 9 green, 9 blue, 3 red; 9 blue, 1 red, 6 green
+Game 39: 3 blue, 16 red; 10 red, 4 green, 2 blue; 2 blue, 13 red, 1 green; 2 blue, 11 red, 2 green; 3 green, 13 red
+Game 40: 2 blue, 3 red, 2 green; 2 green, 2 blue, 6 red; 1 green, 9 red
+Game 41: 1 blue, 12 red; 8 blue, 1 red, 5 green; 1 green, 7 blue, 13 red; 8 red, 7 blue, 7 green; 4 green, 17 red, 9 blue; 2 green, 8 blue
+Game 42: 2 green, 6 red, 1 blue; 3 red, 2 green; 9 red, 1 green; 2 red, 2 green
+Game 43: 10 blue, 9 red; 14 blue, 4 green; 5 red, 3 green, 9 blue; 5 blue, 8 green, 1 red
+Game 44: 3 blue, 10 green, 1 red; 1 blue, 13 red, 3 green; 1 blue, 5 green, 16 red
+Game 45: 1 red, 1 green, 3 blue; 2 green, 1 red, 5 blue; 1 red, 2 blue, 1 green; 1 blue; 1 green, 5 blue; 1 blue
+Game 46: 8 green, 8 blue, 4 red; 10 green, 4 red, 7 blue; 2 red, 3 green, 14 blue
+Game 47: 3 green, 3 red; 5 green, 2 blue, 6 red; 3 blue, 5 red, 15 green; 2 green, 2 blue, 2 red
+Game 48: 11 blue, 12 green, 3 red; 8 blue, 3 red, 3 green; 1 green, 6 blue, 2 red
+Game 49: 3 blue, 17 green, 1 red; 4 red, 16 blue, 17 green; 1 green, 3 red, 5 blue; 14 blue, 1 red, 12 green
+Game 50: 2 blue, 5 red, 6 green; 8 blue, 11 green, 5 red; 2 green, 2 red, 6 blue
+Game 51: 1 green, 2 red; 4 green; 1 blue, 10 green
+Game 52: 8 blue, 9 red, 4 green; 2 green, 8 blue, 2 red; 1 red, 2 green, 1 blue; 2 blue, 8 green, 8 red; 4 red, 1 green, 9 blue; 11 blue, 4 green, 8 red
+Game 53: 1 green, 2 red; 3 blue, 1 green, 9 red; 5 blue, 11 red; 4 blue, 6 red, 1 green; 5 blue, 10 red; 5 blue, 5 red, 1 green
+Game 54: 1 blue, 8 green; 9 green, 1 red, 11 blue; 16 green, 8 blue; 5 green
+Game 55: 7 blue, 2 red, 1 green; 16 green, 19 blue, 5 red; 9 green, 3 blue, 7 red; 8 blue, 2 green, 4 red; 8 green, 15 blue, 5 red
+Game 56: 9 blue, 1 red, 4 green; 12 green, 12 blue; 1 green, 1 red, 5 blue
+Game 57: 1 green, 10 blue; 1 red, 9 blue; 10 blue, 1 red, 3 green
+Game 58: 6 red, 15 blue, 3 green; 13 blue, 5 red; 10 blue, 2 red; 5 red, 1 green, 14 blue
+Game 59: 7 red, 1 blue, 9 green; 4 green, 12 red, 2 blue; 6 green, 20 red, 1 blue; 4 blue, 9 red, 2 green; 8 red, 4 blue, 2 green
+Game 60: 11 red, 8 blue, 1 green; 18 green, 11 blue; 16 red, 10 blue, 7 green; 6 blue, 8 red; 7 red, 15 green, 4 blue
+Game 61: 1 blue, 1 green, 8 red; 3 red, 7 blue; 4 blue, 10 red; 1 green, 5 red, 8 blue; 10 red, 7 blue
+Game 62: 12 blue, 1 red, 1 green; 2 green, 1 red, 7 blue; 3 green, 18 blue; 11 blue, 4 green
+Game 63: 4 green, 4 red, 8 blue; 7 red, 5 blue, 5 green; 2 green, 20 blue, 4 red; 1 green, 4 blue, 3 red
+Game 64: 2 green, 2 red; 3 green, 2 blue; 12 green, 2 red, 4 blue; 5 red, 9 green, 8 blue; 7 blue, 6 green; 3 green, 5 red
+Game 65: 8 red, 2 green, 13 blue; 11 blue; 7 blue, 2 green; 12 blue, 1 green, 9 red
+Game 66: 1 blue, 3 red, 19 green; 3 red, 17 blue, 15 green; 9 green, 9 blue
+Game 67: 2 green, 7 blue, 1 red; 3 green, 1 red, 7 blue; 1 red, 6 green; 7 blue, 2 red, 10 green; 2 red, 5 green, 4 blue
+Game 68: 14 red, 10 green, 8 blue; 11 red, 1 blue, 6 green; 7 red, 7 green; 12 blue, 10 green, 3 red; 6 red, 12 blue, 10 green; 8 green, 14 red, 3 blue
+Game 69: 4 green, 8 red; 2 red, 15 green; 5 red, 1 blue, 12 green; 13 red, 6 green; 10 green, 13 red, 1 blue
+Game 70: 3 red, 10 blue, 3 green; 8 red, 11 blue, 11 green; 5 red, 13 green
+Game 71: 18 green, 3 red, 1 blue; 3 blue, 14 green, 2 red; 6 blue, 20 green, 4 red
+Game 72: 2 blue, 1 red; 2 blue, 3 green, 1 red; 4 blue, 2 red, 4 green
+Game 73: 11 red, 11 green; 5 green, 1 blue; 8 red, 7 green, 4 blue; 5 blue, 7 red, 12 green
+Game 74: 12 red, 12 green, 5 blue; 10 red, 7 blue, 15 green; 6 green, 19 red, 19 blue; 3 red, 7 blue, 16 green; 11 red, 14 green, 16 blue
+Game 75: 5 red, 17 green, 8 blue; 10 red, 8 blue, 19 green; 9 blue, 6 red, 18 green; 3 blue, 13 red, 12 green
+Game 76: 5 green, 2 red, 8 blue; 3 blue, 14 red, 2 green; 14 red, 1 blue; 3 green, 8 blue, 15 red; 11 red, 1 green; 11 red, 9 blue, 3 green
+Game 77: 3 blue, 2 red; 1 blue, 8 green, 11 red; 14 green, 14 red; 3 red, 5 green, 5 blue; 2 green, 16 blue, 3 red; 13 red, 7 green, 5 blue
+Game 78: 3 blue, 1 green, 1 red; 5 blue, 1 green, 1 red; 9 blue, 7 red, 1 green; 5 blue, 1 green, 5 red; 10 blue, 3 green, 7 red
+Game 79: 19 green, 17 blue, 4 red; 7 green, 7 red, 16 blue; 4 red, 10 green; 13 blue, 17 green, 2 red
+Game 80: 9 blue, 3 green; 15 blue, 1 red; 3 blue, 12 green, 2 red; 1 red, 14 green, 13 blue; 1 red, 10 blue, 16 green; 8 blue, 6 green, 2 red
+Game 81: 1 green, 3 red, 19 blue; 2 red, 1 green, 9 blue; 1 green, 2 red, 8 blue; 1 red, 1 green, 11 blue; 1 green, 3 red, 11 blue
+Game 82: 8 red, 1 blue, 4 green; 9 green, 3 blue, 4 red; 3 green, 3 blue, 18 red
+Game 83: 3 red, 13 blue, 16 green; 16 green, 2 blue; 14 green, 12 blue; 8 green, 14 blue, 4 red; 12 green, 4 blue; 20 green, 1 red
+Game 84: 4 green, 4 blue, 5 red; 6 red, 6 blue, 8 green; 5 blue, 12 green, 3 red; 5 red, 13 green; 6 blue, 1 green, 5 red
+Game 85: 10 green; 7 green, 1 blue; 5 red, 5 blue, 1 green; 2 green, 2 red, 3 blue; 3 red, 10 green, 3 blue; 1 blue, 1 red
+Game 86: 3 green, 1 red, 3 blue; 2 red, 2 green; 9 green, 2 blue, 3 red; 3 red, 3 blue, 4 green
+Game 87: 6 red, 4 green; 1 red, 3 green, 5 blue; 1 green, 7 blue, 4 red
+Game 88: 2 green, 4 red, 3 blue; 5 green, 1 blue; 3 red, 5 green, 2 blue; 1 green, 6 red, 1 blue; 7 red, 2 blue; 17 red, 13 green
+Game 89: 4 green, 2 blue, 6 red; 15 red, 7 green, 10 blue; 7 red, 9 blue, 4 green
+Game 90: 9 red, 17 blue; 1 green, 9 blue; 5 red, 8 blue; 3 blue, 9 red, 1 green; 17 blue, 1 red
+Game 91: 7 green, 3 red, 5 blue; 4 blue, 3 red, 9 green; 9 red, 7 blue, 7 green; 5 red, 6 blue, 3 green; 10 red, 2 green, 6 blue
+Game 92: 13 blue, 8 red; 7 green, 1 red, 8 blue; 5 blue, 4 red, 2 green; 9 red, 10 blue
+Game 93: 6 green; 1 blue, 16 green, 6 red; 5 green, 1 blue, 5 red; 5 red, 6 green; 16 green, 2 red, 1 blue; 11 green, 2 red
+Game 94: 9 blue, 4 green; 12 green, 17 blue; 4 green, 5 blue, 6 red; 2 red, 2 blue, 12 green
+Game 95: 5 red, 4 blue, 5 green; 2 blue, 4 green, 4 red; 4 blue, 2 red, 7 green; 1 green, 7 blue, 8 red
+Game 96: 7 blue, 6 green, 2 red; 3 green, 1 blue; 7 blue, 3 red, 5 green; 1 green, 5 blue; 6 blue, 2 red; 2 green, 1 red
+Game 97: 10 red, 1 green, 1 blue; 4 green, 11 red, 2 blue; 4 red, 1 blue, 4 green
+Game 98: 3 green, 4 blue, 7 red; 7 red, 8 green; 7 green, 16 red, 1 blue; 8 green, 2 blue, 4 red; 5 green, 3 blue, 18 red
+Game 99: 6 green, 12 red, 1 blue; 5 blue, 1 red, 7 green; 5 green, 7 red, 10 blue; 8 blue, 1 red, 7 green; 17 red, 4 blue, 9 green
+Game 100: 6 blue, 10 green; 3 green, 4 blue, 1 red; 7 blue, 1 red, 12 green

day2/rust/.gitignore

@@ -0,0 +1 @@
+target

day2/rust/Cargo.lock

@@ -0,0 +1,7 @@
+# This file is automatically @generated by Cargo.
+# It is not intended for manual editing.
+version = 3
+
+[[package]]
+name = "rust"
+version = "0.1.0"

day2/rust/Cargo.toml

@@ -0,0 +1,8 @@
+[package]
+name = "rust"
+version = "0.1.0"
+edition = "2021"
+
+# See more keys and their definitions at https://doc.rust-lang.org/cargo/reference/manifest.html
+
+[dependencies]

day2/rust/src/main.rs

@@ -0,0 +1,135 @@
+struct Game {
+    id: usize,
+    grabs: Vec<Grab>,
+}
+
+struct Grab {
+    cubes: Vec<Cube>,
+}
+
+struct Cube {
+    count: usize,
+    color: Color,
+}
+
+#[derive(Debug)]
+enum Color {
+    RED,
+    GREEN,
+    BLUE,
+    UNKNOWN,
+}
+
+fn main() {
+    let stdin = std::io::stdin();
+
+    let mut games: Vec<Game> = Vec::new();
+
+    // Read and parse input
+    for line in stdin.lines() {
+        let line = line.unwrap();
+
+        let (game_id_str, grab_strs) = line.split_once(":").unwrap();
+
+        let game_id = game_id_str.split_once(" ").unwrap().1.parse().unwrap();
+
+        let mut grabs = Vec::new();
+
+        for grab_str in grab_strs.split(";") {
+            let mut cubes = Vec::new();
+
+            for cube in grab_str.split(",").map(|str| str.trim()) {
+                let (count, color) = cube.split_once(' ').unwrap();
+
+                let count = count.parse().unwrap();
+                let color = match color {
+                    "red" => Color::RED,
+                    "green" => Color::GREEN,
+                    "blue" => Color::BLUE,
+                    _ => Color::UNKNOWN,
+                };
+
+                cubes.push(Cube { count, color })
+            }
+
+            grabs.push(Grab { cubes });
+        }
+
+        games.push(Game { id: game_id, grabs })
+    }
+
+    // Part 1
+    let red_cubes = 12;
+    let green_cubes = 13;
+    let blue_cubes = 14;
+    let mut part1 = 0;
+
+    for game in &games {
+        let mut possible = true;
+        for grab in &game.grabs {
+            for cube in &grab.cubes {
+                match cube.color {
+                    Color::RED => {
+                        if cube.count > red_cubes {
+                            possible = false;
+                            break;
+                        }
+                    }
+                    Color::GREEN => {
+                        if cube.count > green_cubes {
+                            possible = false;
+                            break;
+                        }
+                    }
+                    Color::BLUE => {
+                        if cube.count > blue_cubes {
+                            possible = false;
+                            break;
+                        }
+                    }
+                    Color::UNKNOWN => (),
+                }
+            }
+
+            if !possible {
+                break;
+            }
+        }
+
+        if possible {
+            part1 += game.id;
+        }
+    }
+
+    println!("{}", part1);
+
+    // Part 2
+    let mut part2 = 0;
+
+    for game in &games {
+        let mut min_reds = 0;
+        let mut min_greens = 0;
+        let mut min_blues = 0;
+
+        for grab in &game.grabs {
+            for cube in &grab.cubes {
+                match cube.color {
+                    Color::RED => {
+                        min_reds = std::cmp::max(min_reds, cube.count);
+                    }
+                    Color::GREEN => {
+                        min_greens = std::cmp::max(min_greens, cube.count);
+                    }
+                    Color::BLUE => {
+                        min_blues = std::cmp::max(min_blues, cube.count);
+                    }
+                    Color::UNKNOWN => (),
+                }
+            }
+        }
+
+        part2 += min_reds * min_greens * min_blues;
+    }
+
+    println!("{}", part2);
+}

day2/sample.txt

@@ -0,0 +1,5 @@
+Game 1: 3 blue, 4 red; 1 red, 2 green, 6 blue; 2 green
+Game 2: 1 blue, 2 green; 3 green, 4 blue, 1 red; 1 green, 1 blue
+Game 3: 8 green, 6 blue, 20 red; 5 blue, 4 red, 13 green; 5 green, 1 red
+Game 4: 1 green, 3 red, 6 blue; 3 green, 6 red; 3 green, 15 blue, 14 red
+Game 5: 6 red, 1 blue, 3 green; 2 blue, 1 red, 2 green

day20/c/day20.c

@@ -0,0 +1,204 @@
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+
+#define LINE_MAX_LENGTH 256
+#define MAX_CONNECTED 16
+#define MAX_MODULES 128
+#define MAX_QUEUE 1024
+
+typedef enum module_type {
+    FLIPFLOP,
+    CONJUNCTION,
+    BROADCAST,
+} module_type_t;
+
+typedef struct module {
+    module_type_t type;
+    char name[16];
+    int name_length;
+    int state;
+    struct module *inputs[MAX_CONNECTED];
+    int input_memory[MAX_CONNECTED];
+    int input_num;
+    struct module *outputs[MAX_CONNECTED];
+    int output_num;
+    char output_names[MAX_CONNECTED][16];
+    int output_name_lengths[MAX_CONNECTED];
+} module_t;
+
+typedef struct signal {
+    int value;
+    module_t *module;
+    module_t *source;
+} signal_t;
+
+int main() {
+    char *p, *buf, c, *q;
+
+    buf = (char *)malloc(LINE_MAX_LENGTH);
+    memset(buf, 0, LINE_MAX_LENGTH);
+    p = buf;
+
+    module_t *modules = (module_t*)malloc(MAX_MODULES * sizeof(module_t));
+    memset(modules, 0, MAX_MODULES * sizeof(module_t));
+    int modules_num = 0;
+
+    while ((c = getchar()) != EOF) {
+        *p++ = c;
+        if (c == '\n') {
+            p = buf;
+
+            if (*p == '%' || *p == '&' || *p == '#') {
+                switch (*p) {
+                    case '%':
+                        modules[modules_num].type = FLIPFLOP;
+                        break;
+                    case '&':
+                        modules[modules_num].type = CONJUNCTION;
+                        break;
+                }
+                p++;
+            } else {
+                modules[modules_num].type = BROADCAST;
+            }
+            q = p;
+            while(*p != ' ') p++;
+            strncpy(modules[modules_num].name, q, p - q);
+            modules[modules_num].name_length = p - q;
+            p++;
+            while(*p != ' ') p++;
+            p++;
+            // Read outputs
+            while(*p != '\0') {
+                q = p;
+                while (*p != '\n' && *p != ',') p++;
+                strncpy(modules[modules_num].output_names[modules[modules_num].output_num], q, p - q);
+                modules[modules_num].output_name_lengths[modules[modules_num].output_num] = p - q;
+                modules[modules_num].output_num++;
+                p+=2;
+            }
+
+            modules_num++;
+            memset(buf, 0, LINE_MAX_LENGTH);
+            p = buf;
+        }
+    }
+
+    // Link up modules
+    for (int i = 0; i < modules_num; i++) {
+        // Link outputs
+        int found = 0;
+        for (int j = 0; j < modules[i].output_num; j++) {
+            for (int k = 0; k < modules_num; k++) {
+                if (!strcmp(modules[k].name, modules[i].output_names[j])) {
+                    modules[i].outputs[j] = &modules[k];
+                    found++;
+                    break;
+                }
+            }
+        }
+        // Link inputs
+        for (int j = 0; j < modules_num; j++) {
+            for (int k = 0; k < modules[j].output_num; k++) {
+                if (!strcmp(modules[i].name, modules[j].output_names[k])) {
+                    modules[i].inputs[modules[i].input_num] = &modules[j];
+                    modules[i].input_num++;
+                    break;
+                }
+            }
+        }
+    }
+
+    // Find start
+    module_t *broadcast;
+    for (int i = 0; i < modules_num; i++) {
+        if (modules[i].type == BROADCAST) {
+            broadcast = &modules[i];
+            break;
+        }
+    }
+
+    signal_t signal_queue[MAX_QUEUE];
+    unsigned long low_pulses = 0, high_pulses = 0;
+
+    int turned_on = 0;
+#ifdef PART2
+    for(unsigned long l = 0; !turned_on; l++) {
+#else
+    for (unsigned long l = 0; l < 1000; l++) {
+#endif
+        memset(signal_queue, 0, MAX_QUEUE * sizeof(signal_t));
+        int signal_queue_length = 1;
+        signal_queue[0].value = 0;
+        signal_queue[0].module = broadcast;
+        signal_queue[0].source = NULL;
+        while (signal_queue_length > 0) {
+            // Pop first
+            signal_t signal = signal_queue[0];
+            for (int i = 0; i < signal_queue_length - 1; i++) {
+                memcpy(&signal_queue[i], &signal_queue[i+1], sizeof(signal_t));
+            }
+            signal_queue_length--;
+            int output;
+            if (signal.value) {
+                high_pulses++;
+            } else {
+                low_pulses++;
+            }
+
+            if (signal.module == NULL) {
+                if (signal.value == 0) {
+                    printf("Machine turn on: %lu\n", l+1);
+                    turned_on = 1;
+                    break;
+                }
+                continue;
+            }
+
+            switch (signal.module->type) {
+                case FLIPFLOP:
+                    if (signal.value == 0) {
+                        signal.module->state = !signal.module->state;
+                        output = signal.module->state;
+                    } else {
+                        output = -1;
+                    }
+                    break;
+                case BROADCAST:
+                    output = signal.value;
+                    break;
+                case CONJUNCTION:
+                    // Update input memory
+                    for (int i = 0; i < signal.module->input_num; i++) {
+                        if (signal.module->inputs[i] == signal.source) {
+                            signal.module->input_memory[i] = signal.value;
+                        }
+                    }
+                    int all_high = 1;
+                    for (int i = 0; i < signal.module->input_num; i++) {
+                        if (signal.module->input_memory[i] == 0) {
+                            all_high = 0;
+                            break;
+                        }
+                    }
+                    output = !all_high;
+                    break;
+            }
+
+            if (output != -1) {
+                for (int i = 0; i < signal.module->output_num; i++) {
+                    signal_queue[signal_queue_length].value = output;
+                    signal_queue[signal_queue_length].module = signal.module->outputs[i];
+                    signal_queue[signal_queue_length].source = signal.module;
+                    signal_queue_length++;
+                }
+            }
+        }
+    }
+
+    printf("%lu\n", high_pulses * low_pulses);
+
+    free(buf);
+    free(modules);
+}

day20/input.txt

@@ -0,0 +1,58 @@
+%db -> cq
+%rj -> gp, nd
+%ff -> bk
+%rc -> gp
+%bk -> tv
+%xz -> tf, bn
+%gs -> bn
+%ps -> rs, gp
+%jr -> gp, cg
+&pm -> vf
+%pn -> pp, rt
+%nv -> jr
+%rs -> nv
+%kz -> mj
+%nd -> rc, gp
+%nm -> rt, db
+%dg -> rt, xl
+%vg -> gn
+%hc -> vr
+%ft -> lf, bn
+%mj -> hc, cz
+%vb -> ft
+%qd -> cz, sz
+%pp -> rt
+%cq -> rt, vg
+%sr -> vb
+%lf -> vx, bn
+%lh -> pn, rt
+%ls -> sl, cz
+%tv -> gp, rj
+%tf -> sr, bn
+&mk -> vf
+%bs -> rt, lh
+%vx -> bn, gs
+&bn -> fs, bv, vb, mk, sr, bz, cf
+%rr -> ls
+%bv -> xz
+%hp -> bs, rt
+&pk -> vf
+%cg -> rq
+%gn -> rt, dg
+&cz -> hc, kz, rr, hf, sh
+%sl -> cz, kz
+broadcaster -> sh, nm, ps, fs
+%cf -> bv
+&vf -> rx
+&rt -> pk, xl, nm, vg, db
+%xl -> hp
+%sh -> rr, cz
+%bz -> cf
+%fz -> dn, cz
+&gp -> rs, nv, pm, cg, ff, bk, ps
+%fs -> bz, bn
+&hf -> vf
+%vr -> cz, qd
+%rq -> gp, ff
+%sz -> cz, fz
+%dn -> cz

day20/sample.txt

@@ -0,0 +1,5 @@
+broadcaster -> a, b, c
+%a -> b
+%b -> c
+%c -> inv
+&inv -> a

day20/sample2.txt

@@ -0,0 +1,5 @@
+broadcaster -> a
+%a -> inv, con
+&inv -> b
+%b -> con
+&con -> output

day21/c/day21.c

@@ -0,0 +1,102 @@
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+
+#define LINE_MAX_LENGTH 256
+
+typedef enum tile_type {
+    GARDEN_PLOT,
+    ROCK,
+    WALKED,
+} tile_type_t;
+
+int main(int argc, char *argv[]) {
+    if (argc != 2) {
+        fprintf(stderr, "Please specify the step number\n"); 
+        return 1;
+    }
+    int step_number = 0;
+    sscanf(argv[1], "%i", &step_number); 
+    char *p, *buf, c;
+
+    tile_type_t map[LINE_MAX_LENGTH][LINE_MAX_LENGTH];
+    int x = 0, y = 0;
+
+    buf = (char *)malloc(LINE_MAX_LENGTH);
+    memset(buf, 0, LINE_MAX_LENGTH);
+    p = buf;
+
+    int start[2];
+
+    while ((c = getchar()) != EOF) {
+        *p++ = c;
+        if (c == '\n') {
+            p = buf;
+            x = 0;
+            while (*p != '\n') {
+                switch (*p) {
+                    case '.':
+                        map[x][y] = GARDEN_PLOT;
+                        break;
+                    case '#':
+                        map[x][y] = ROCK;
+                        break;
+                    case 'S':
+                        map[x][y] = GARDEN_PLOT;
+                        start[0] = x;
+                        start[1] = y;
+                        break;
+                }
+                x++;
+                p++;
+            }
+            y++;
+            memset(buf, 0, LINE_MAX_LENGTH);
+            p = buf;
+        }
+    }
+
+    tile_type_t walked_curr[LINE_MAX_LENGTH][LINE_MAX_LENGTH], walked_next[LINE_MAX_LENGTH][LINE_MAX_LENGTH];
+    memcpy(walked_curr, map, sizeof(map));
+    walked_curr[start[0]][start[1]] = WALKED;
+
+    for (int i = 0; i < step_number; i++) {
+        memcpy(walked_next, map, sizeof(map));
+        for (int j = 0; j < y; j++) {
+            for (int k = 0; k < x; k++) {
+                if (walked_curr[k][j] == WALKED) {
+                    // UP
+                    if (j > 0 && walked_next[k][j-1] == GARDEN_PLOT) {
+                        walked_next[k][j-1] = WALKED;
+                    }
+                    // LEFT
+                    if (k > 0 && walked_next[k-1][j] == GARDEN_PLOT) {
+                        walked_next[k-1][j] = WALKED;
+                    }
+                    // DOWN
+                    if (j < y - 1 && walked_next[k][j+1] == GARDEN_PLOT) {
+                        walked_next[k][j+1] = WALKED;
+                    }
+                    // RIGHT
+                    if (k < x - 1 && walked_next[k+1][j] == GARDEN_PLOT) {
+                        walked_next[k+1][j] = WALKED;
+                    }
+                }
+            }
+        }
+        memcpy(walked_curr, walked_next, sizeof(map));
+    }
+
+    int part1 = 0;
+
+    for (int i = 0; i < y; i++) {
+        for (int j = 0; j < x; j++) {
+            if (walked_curr[j][i] == WALKED) {
+                part1++;
+            }
+        }
+    }
+
+    printf("%i\n", part1);
+    free(buf);
+}

day21/input.txt

@@ -0,0 +1,131 @@
+...................................................................................................................................
+...##......#....#...#.....#.#....#...#...#...#......#........................##......#..#..#.#........#....................##......
+...#.......#..........#..#....#................#...##.....##...................#..........###......#.....#.........#....#.#........
+........#..##.............#..#...##...#..#...##...............................#.........................#..........................
+..............#............#..#..........#.#.#....#...#......................#..#......#.##...#............................#.......
+..##...............#...#...#......#.......................................#..............##...............#.....#...........#...#..
+.##............#.................#...#..#......#...................................#.......#.#..#......##................##........
+......###...#...#........#..............#....#.......##.......................##.......#..#.......#.........#...................#..
+.................#...........................................#......................#.....#.....##...........#...............#.....
+..#...#....#.......##...........#..#.............#............................##........#.......#...#...#...#....#....##...........
+..............#..#.....#.....#.........#..#..#..#..#.......#.#..#....##........#.....#.........#..............#........#..#...#....
+...##...............#...#.#....#............##..#.......................................#.......#...........#..#...........##....#.
+.......................................#......#...........#..........#.............#..........##.............#....#..##....#.......
+..................................#.............#........#...#.##.....................#....................#.##....#.............#.
+.#......##...#......#..#...#...........#...#.............#.............#..#.........#..#.#........#.#...........#..................
+............#............#..........#........#..........#.....#.#...#.......#........#.#...........#....#.............#.........#..
+.....#.......##............#...#.#.#...#...#..............##..#....#......#......................#...#...#..........#......#.#.....
+........#....#....#......#..........#........................#.....#....................................#.....#....#..##.##....#...
+............#.................#.##.........#.........#.....#........#.........#........#....###...........#.............#..........
+....##....#..#............#...#.#..#.........................#.#....##.....................#........#.........#....#....#........#.
+...#...#...........#..#..................#.......#.#..#............................................##................#.............
+...........#......#....#........#.#..........................#.#......#......##.............#..#...#...#.#..................#..#...
+.............................#........#............#........#........#.#.......#...............##....#........#...#..#..#..........
+..................................#...........................#.#..#.........................#...#.#......#..............##.....##.
+........................#..........................#..................#...#............................#.......#...........#...##..
+.......#.#.....#....#.....#................................##...#.........##..#.....................#..............................
+......#........##..........#.................#..##......#..#.......#..........#....................................................
+....#..........#......................................................##.#..#.#.##..................#......#............##...#.....
+.............#..........#.#..............................................#.#........#....#...........#.......................#.....
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+......#......#......#.....#..............#.#.........##.................#....................#............#....##........#.........
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+........#...#..................#.........#............#...............#.#..#.........#....#...............#.............##.........
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+.....#.#...............#....#..#....#...........#........#.#..................#.....##....#.......#......#......................#..
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+...#..#...........#.............#..........##..............................###...........#.#.....##.......#.............#..........
+...##.....................##...#..#.....#.........#.#....#.#.....................#..............#.#...#...#......#..............#..
+......##................#.................#.#........#.#..#................#............#......#.#..............#...............#..
+.......#...........#.................................##..................#...#........#.......#..##...##...........#.........#.....
+..............#........#.............#..........#...............#..#.......#.........#..#...............#......#..#.........##.#...
+.....#..........................................#...............#....#......#..#................................#...............#..
+...............#.......#..#.........#......#..................#........#................#.#...........#....##......#............#..
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+................#.....#..#.#......#.............#.....#...........##....#...#.#.....#.........#....................................
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+.........#.#..............#........#.........#..#...#........#............##......##.......#....##.............#...................
+..........##.....................#................#...#....#........#.....#..........#........#................#..###..............
+......................#............................#........................#.#..#..........#......................................
+........#...........#.#....#.........#.....#..........#..#.#..............#.......................#..#................#.#..........
+.................................................................S.................................................................
+.........#.....#..#..........#.....#...........#...............##..#...............#.##....#...........#........#.#....#....#......
+.........##...#......#..#.#................#...........#..#...........#...#....#..............#......#..#.................##.......
+.....................##.....................##...#.......#......#.............................#..#.................................
+........................#..............#....#.................#....#...........#.................#...#.........#........#..........
+.........#..#.#...#.#..................#..............#.#...###....#......#......#.#....#..##..............#............#..........
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+..#........#......##.............................#..............#..#....................##.......#....#..#..#..........#...........
+.....................#.....#...........#.##................#.#....#.#.#............#...#..##.............#.....##..................
+..##............#........#........#...#......#..........##.................#...#.#..........#...................................##.
+...#.............#....#...#..#........#.........#......#..................#..#..#..........#.....#........#.#....##............#...
+...#.............#...............................#.......#....#..........#..........................##......##...#.............#...
+....#................#..#.#................#.....#.......#..................#.......................#.#............................
+....#.#..............#..#.........#..#..#................#..#...#.#..............#......#...................#......................
+.#......#....................#.................#........##......#......##..........#...............#..##.#.....#.............#.....
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+......#..................#......#.......#.......#..............#......#.........#.......#..#.#.#...##.....#.............#..........
+.#...................#...#....#......#.#.....#.....#..................#.#......#.......#.....#..#......................#.....#.....
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+...#..#........#........#...........#.#...#...#.#..#.#...#..................#........#........#.#.##...#...........#...............
+........#.......................#.............#....#...##.........#....................................#..............#...#........
+...#...........##........#..#.......#...............................#..................#.....#.......#.#.........#.................
+..........#...............#.###...................#..................................#.....#...#................##...............#.
+..#......#..........................#...........................#..................#..#........#....##...................##......#.
+....#...........#..#..........................#......###................#...........................#.........#.#........#.#.......
+...#...#..#........#...............#...........#.......#........................##..#...............#............#...........#.....
+.....#..........................#..#........#.......#......#......#..........#..#.....#.....#..#.................#........#........
+....#...##.......................#...#.....#.....................................##.#..#....#....#................#................
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+............#...........#........#........................#.#.......#..#..#.........##...................#......##.#.......#.......
+.........#......#......#............#.....#...##...#...............................#.....#..............##............#..#.....##..
+...........................#.................#...........#.........#....#.#.#....#......#..#....................#......#...........
+....#.#..............................#......#..........#...........#....#.............#.#..............................#.....#..#..
+...........#...........#.............##....#......#.........#................#........#...............................#............
+...#........#.#....#.....................#..........#.......#...#.........#..........................##........#.#.#...##..........
+....#.#....#.........#.......#....................#...........#..........#....#......................#.............#.....#..#....#.
+..........#................................#......#....#......#.................................................#..................
+.............#................................#...#.##.#.....#.......#....#............###.......#........##.......................
+..........#......##.............#.........#............................#.#..#.......................................#.....#......#.
+...#.....#.......#............#.............#.#...#.....#.............#..#..........##.......................#.....................
+..........................#......#..................#..#........#............#.......##......................###.......#.....#.....
+............#.#....#.#................................##......#..............#..#.#........................#......#...#...#........
+......##..........#......###...#......................#.........#.#............#..............#......#..............#.......#......
+............#........#.....#........#..#.......#...#...................#.....#..................##.............#.................#.
+........#.#........##..................................#......#......................................#.....................#.#...#.
+.#.......##......#.....#..........#................#...................##..#...............#.......##....................#.........
+...#..#..#.............................#...................#................#....................................#........#........
+.....#....................................#.........##.............#...........................#...................................
+............................#....#......#...................#..................................#...........................##......
+...............#...#..#...#.###.#...........#..............#..........#...............##........#.##.#....#.#.............##.....#.
+...........#.##......#...#.#.........#.#.#...#.........................................#..........#.............#.#.............#..
+........#...............#........#........................#.#......#......#......................#...........#.........#.#...#.....
+....#..#.............#......................#...................#.....##...............#...#........#.................#............
+............#......#...#.....#..........#....#...............##.....##..#.........#....#..#.......#...#..#.........................
+......#...........#.......#...#.#.....#...#......#...........#......#................#................#....#.#...#.................
+.......#.#...#.......#......#.................................#..............................#...........#.............#.........#.
+...................................#.....#.........#.............................#..#............#...................#...#.........
+...............#......#...........................#................#...............##...........#......#........#....##......#.#...
+...............#....................##....#...#.....#.................................#..#.............#.#..#.....#..#.#...........
+.............................#......##..#........................................##....#.................#......#....#...#.........
+......#.#.#...............#.......#............................................................#................#..........#..#....
+...#.#...........#..#......#....###...............#..#..#......................#....#..............#......#................#.......
+.......................#....#.....#..#.##.#..........#.....................#..................................#....####.##.........
+......#..........##...#...........................#....#.................#........#.......................#.................#..#...
+.................#..#...................#..#...#...##...#..................#..........#.#....#..#...........................#....#.
+...................................................................................................................................

day21/sample.txt

@@ -0,0 +1,11 @@
+...........
+.....###.#.
+.###.##..#.
+..#.#...#..
+....#.#....
+.##..S####.
+.##..#...#.
+.......##..
+.##.#.####.
+.##..##.##.
+...........

day22/c/day22.c

@@ -0,0 +1,140 @@
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+#include <omp.h>
+
+#define LINE_MAX_LENGTH 256
+#define MAX_BRICKS 2048
+#define NUM_0_CHARCODE 48
+#define NUM_9_CHARCODE NUM_0_CHARCODE + 9
+#define max(a,b) ((a) > (b) ? (a) : (b))
+#define min(a,b) ((a) < (b) ? (a) : (b))
+#define in_range(c,a,b) ((c) <= max(a,b) && (c) >= min(a,b))
+
+typedef struct corner {
+    int x;
+    int y;
+    int z;
+} corner_t;
+
+typedef struct brick {
+    corner_t corners[2];
+    int fallen;
+} brick_t;
+
+int fall(brick_t bricks[], int bricks_num);
+int intersect(brick_t brick_a, brick_t brick_b);
+
+int main() {
+    char *p, *buf, c;
+
+    buf = (char *)malloc(LINE_MAX_LENGTH);
+    memset(buf, 0, LINE_MAX_LENGTH);
+    p = buf;
+
+    brick_t bricks[MAX_BRICKS];
+    int bricks_num = 0;
+
+    while ((c = getchar()) != EOF) {
+        *p++ = c;
+        if (c == '\n') {
+            p = buf;
+            sscanf(p, "%i", &bricks[bricks_num].corners[0].x);
+            while (*p != ',') p++;
+            p++;
+            sscanf(p, "%i", &bricks[bricks_num].corners[0].y);
+            while (*p != ',') p++;
+            p++;
+            sscanf(p, "%i", &bricks[bricks_num].corners[0].z);
+            while (*p != '~') p++;
+            p++;
+            sscanf(p, "%i", &bricks[bricks_num].corners[1].x);
+            while (*p != ',') p++;
+            p++;
+            sscanf(p, "%i", &bricks[bricks_num].corners[1].y);
+            while (*p != ',') p++;
+            p++;
+            sscanf(p, "%i", &bricks[bricks_num].corners[1].z);
+            bricks_num++;
+            memset(buf, 0, LINE_MAX_LENGTH);
+            p = buf;
+        }
+    }
+
+    
+    while (fall(bricks, bricks_num));
+    for (int i = 0; i < bricks_num; i++) {
+        bricks[i].fallen = 0;
+    }
+
+    int part1 = 0;
+    int part2 = 0;
+#pragma omp parallel for schedule(dynamic)
+    for (int i = 0; i < bricks_num; i++) {
+        brick_t bricks_copy[MAX_BRICKS];
+        memcpy(bricks_copy, bricks, sizeof(bricks));
+        bricks_copy[i].corners[0].z = 0;
+        bricks_copy[i].corners[1].z = 0;
+        int fallen = 0;
+        while (fall(bricks_copy, bricks_num));
+        for (int j = 0; j < bricks_num; j++) {
+            fallen += bricks_copy[j].fallen;
+        }
+#pragma omp critical
+        {
+            if (fallen == 0) {
+                part1++;
+            }
+            part2 += fallen;
+        }
+    }
+
+    printf("%i\n", part1);
+    printf("%i\n", part2);
+
+    free(buf);
+}
+
+int fall(brick_t bricks[], int bricks_num) {
+    int result = 0;
+    for (int i = 0; i < bricks_num; i++) {
+        int fallen = 0;
+        for (;;) {
+            bricks[i].corners[0].z--;
+            bricks[i].corners[1].z--;
+            if (bricks[i].corners[0].z <= 0 || bricks[i].corners[1].z <= 0) {
+                break;
+            }
+            int collision = 0;
+            for (int j = 0; j < bricks_num; j++) {
+                if (i == j) continue;
+                if (intersect(bricks[i], bricks[j])) {
+                    collision = 1;
+                    break;
+                }
+            }
+            if (collision) {
+                break;
+            }
+            bricks[i].fallen = 1;
+            fallen = 1;
+        }
+        bricks[i].corners[0].z++;
+        bricks[i].corners[1].z++;
+        result += fallen;
+    }
+    
+    return result;
+}
+
+int intersect(brick_t brick_a, brick_t brick_b) {
+    if (
+        (in_range(brick_b.corners[0].x, brick_a.corners[0].x, brick_a.corners[1].x) || in_range(brick_b.corners[1].x, brick_a.corners[0].x, brick_a.corners[1].x) || in_range(brick_a.corners[1].x, brick_b.corners[0].x, brick_b.corners[1].x) || in_range(brick_a.corners[0].x, brick_b.corners[0].x, brick_b.corners[1].x)) &&
+        (in_range(brick_b.corners[0].y, brick_a.corners[0].y, brick_a.corners[1].y) || in_range(brick_b.corners[1].y, brick_a.corners[0].y, brick_a.corners[1].y) || in_range(brick_a.corners[1].y, brick_b.corners[0].y, brick_b.corners[1].y) || in_range(brick_a.corners[0].y, brick_b.corners[0].y, brick_b.corners[1].y)) &&
+        (in_range(brick_b.corners[0].z, brick_a.corners[0].z, brick_a.corners[1].z) || in_range(brick_b.corners[1].z, brick_a.corners[0].z, brick_a.corners[1].z) || in_range(brick_a.corners[1].z, brick_b.corners[0].z, brick_b.corners[1].z) || in_range(brick_a.corners[0].z, brick_b.corners[0].z, brick_b.corners[1].z))
+    ) {
+        return 1;
+    }
+
+    return 0;
+}

day22/sample.txt

@@ -0,0 +1,7 @@
+1,0,1~1,2,1
+0,0,2~2,0,2
+0,2,3~2,2,3
+0,0,4~0,2,4
+2,0,5~2,2,5
+0,1,6~2,1,6
+1,1,8~1,1,9

day23/c/day23.c

@@ -0,0 +1,219 @@
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+#include <stdint.h>
+
+#define LINE_MAX_LENGTH 256
+#define MAX_QUEUE 256*256
+#define cmp(a,b) ((a)[0] == (b)[0] && (a)[1] == (b)[1])
+#define abs(a) ((a) < 0 ? -(a) : (a))
+
+typedef enum tile_type {
+    PATH,
+    FOREST,
+    SLOPE_UP,
+    SLOPE_DOWN,
+    SLOPE_LEFT,
+    SLOPE_RIGHT,
+} tile_type_t;
+
+int check_direction(int curr[2], int dir[2], uint8_t **visited, tile_type_t map[LINE_MAX_LENGTH][LINE_MAX_LENGTH]);
+int highest_cost(int curr[2], tile_type_t map[LINE_MAX_LENGTH][LINE_MAX_LENGTH], int x, int y, uint8_t **visited, int cost, int finish[2], int ignore_slopes, int walkable);
+
+int curr_max = 0;
+
+int directions[4][2] = {
+    {0, -1},
+    {0, 1},
+    {-1, 0},
+    {1, 0}
+};
+
+int main() {
+    char *p, *buf, c;
+
+    buf = (char *)malloc(LINE_MAX_LENGTH);
+    memset(buf, 0, LINE_MAX_LENGTH);
+    p = buf;
+
+    tile_type_t map[LINE_MAX_LENGTH][LINE_MAX_LENGTH];
+    int x = 0, y = 0;
+    int walkable = 0;
+
+    while ((c = getchar()) != EOF) {
+        *p++ = c;
+        if (c == '\n') {
+            p = buf;
+            x = 0;
+            while (*p != '\n') {
+                switch (*p) {
+                    case '.':
+                        map[x][y] = PATH;
+                        walkable++;
+                        break;
+                    case '#':
+                        map[x][y] = FOREST;
+                        break;
+                    case '^':
+                        map[x][y] = SLOPE_UP;
+                        walkable++;
+                        break;
+                    case 'v':
+                        map[x][y] = SLOPE_DOWN;
+                        walkable++;
+                        break;
+                    case '<':
+                        map[x][y] = SLOPE_LEFT;
+                        walkable++;
+                        break;
+                    case '>':
+                        map[x][y] = SLOPE_RIGHT;
+                        walkable++;
+                        break;
+                }
+                x++;
+                p++;
+            }
+            y++;
+            memset(buf, 0, LINE_MAX_LENGTH);
+            p = buf;
+        }
+    }
+
+    int start[2], finish[2];
+    start[1] = 0;
+    finish[1] = y - 1;
+
+    // Find start and finish
+    for (int i = 0; i < x; i++) {
+        if (map[i][0] == PATH) {
+            start[0] = i;
+        }
+        if (map[i][y - 1] == PATH) {
+            finish[0] = i;
+        }
+    }
+
+    uint8_t **visited = (uint8_t**)malloc(x * sizeof(uint8_t*));
+    for (uint8_t i = 0; i < x; i++) {
+        visited[i] = (uint8_t*)malloc(y * sizeof(uint8_t));
+        memset(visited[i], 0, y * sizeof(uint8_t));
+    }
+
+    printf("Part 1: %i\n", highest_cost(start, map, x, y, visited, 0, finish, 0, walkable));
+
+    for (uint8_t i = 0; i < x; i++) {
+        memset(visited[i], 0, y * sizeof(uint8_t));
+    }
+
+    printf("Part 2: %i\n", highest_cost(start, map, x, y, visited, 0, finish, 1, walkable));
+
+    free(buf);
+    for (int i = 0; i < y; i++) {
+        free(visited[i]);
+    }
+    free(visited);
+}
+
+int highest_cost(int curr[2], tile_type_t map[LINE_MAX_LENGTH][LINE_MAX_LENGTH], int x, int y, uint8_t **visited, int cost, int finish[2], int ignore_slopes, int walkable) {
+    if (cmp(curr, finish)) {
+        return cost;
+    }
+
+    // We will never reach the end
+    if ((walkable - cost) < (abs(finish[0] - curr[0]) + abs(finish[1] - curr[1])) || visited[finish[0]][finish[1]-1]) {
+        return -1;
+    }
+    
+    visited[curr[0]][curr[1]] = 1;
+
+    int *options[4], options_num = 0, *dir, max = 0;
+
+    if (map[curr[0]][curr[1]] == SLOPE_UP && !ignore_slopes) {
+        dir = directions[0];
+        if (check_direction(curr, dir, visited, map)) {
+            options[0] = dir;
+            options_num = 1;
+        }
+    } else if (map[curr[0]][curr[1]] == SLOPE_DOWN && !ignore_slopes) {
+        dir = directions[1];
+        if (check_direction(curr, dir, visited, map)) {
+            options[0] = dir;
+            options_num = 1;
+        }
+    } else if (map[curr[0]][curr[1]] == SLOPE_LEFT && !ignore_slopes) {
+        dir = directions[2];
+        if (check_direction(curr, dir, visited, map)) {
+            options[0] = dir;
+            options_num = 1;
+        }
+    } else if (map[curr[0]][curr[1]] == SLOPE_RIGHT && !ignore_slopes) {
+        dir = directions[3];
+        if (check_direction(curr, dir, visited, map)) {
+            options[0] = dir;
+            options_num = 1;
+        }
+    } else {
+        for (int i = 0; i < 4; i++) {
+            int *dir = directions[i];
+            if (check_direction(curr, dir, visited, map)) {
+                options[options_num] = dir;
+                options_num++;
+            }
+        }
+    }
+
+    if (options_num == 0) {
+        return -1;
+    }
+
+
+    uint8_t ***visited_copies = (uint8_t***)malloc(options_num * sizeof(uint8_t**));
+    for (uint8_t i = 0; i < options_num - 1; i++) {
+        visited_copies[i] = (uint8_t**)malloc(x * sizeof(uint8_t*));
+        for (uint8_t j = 0; j < y; j++) {
+            visited_copies[i][j] = (uint8_t*)malloc(y * sizeof(uint8_t));
+            memcpy(visited_copies[i][j], visited[j], y * sizeof(uint8_t));
+        }
+    }
+
+    for (int i = 0; i < options_num; i++) {
+        int next[2];
+        next[0] = curr[0] + options[i][0];
+        next[1] = curr[1] + options[i][1];
+        int c;
+        if (i != options_num - 1) {
+            c = highest_cost(next, map, x, y, visited_copies[i], cost + 1, finish, ignore_slopes, walkable);
+        } else {
+            c = highest_cost(next, map, x, y, visited, cost + 1, finish, ignore_slopes, walkable);
+        }
+        if (c > max) {
+            max = c;
+        }
+    }
+
+    for (int i = 0; i < options_num - 1; i++) {
+        for (int j = 0; j < y; j++) {
+            free(visited_copies[i][j]);
+        }
+        free(visited_copies[i]);
+    }
+    free(visited_copies);
+
+    if (max > curr_max) {
+        curr_max = max;
+        printf("Current best: %i\n", curr_max);
+    }
+
+    return max;
+}
+
+int check_direction(int curr[2], int dir[2], uint8_t **visited, tile_type_t map[LINE_MAX_LENGTH][LINE_MAX_LENGTH]) {
+    int next_x = curr[0] + dir[0];
+    int next_y = curr[1] + dir[1];
+    if (next_y > 0 && !visited[next_x][next_y] && map[next_x][next_y] != FOREST) {
+        return 1;
+    }
+    
+    return 0;
+}

day23/input.txt

@@ -0,0 +1,141 @@
+#.###########################################################################################################################################
+#.#...#...#.....###...#.......###...#####...#...#...#...#...#...#.......#...#.....#.....#.......#...#...#...###...#.....#.....#.............#
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+###########################################################################################################################################.#

day23/sample.txt

@@ -0,0 +1,23 @@
+#.#####################
+#.......#########...###
+#######.#########.#.###
+###.....#.>.>.###.#.###
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+#...#...#.#.>.>.#.>.###
+#.###.###.#.###.#.#v###
+#.....###...###...#...#
+#####################.#

day3/c/day3.c

@@ -0,0 +1,155 @@
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+
+#define LINE_MAX_LENGTH 256
+#define MAX_MAP_SIZE 1024
+#define MAX_NUMBERS 32*1024
+#define abs(a) ((a) < 0 ? -(a) : (a))
+
+struct num_position_t {
+    int x;
+    int y;
+    int length;
+    unsigned int value;
+};
+
+struct num_position_t* create_position(int x, int y, int length, unsigned int value);
+int has_adjacent_symbol(struct num_position_t* number, int symbol_map[MAX_MAP_SIZE][MAX_MAP_SIZE]);
+unsigned int gear_ratio(int x, int y, struct num_position_t** numbers, int num_numbers);
+
+int main() {
+    char *p, *buf, c, tmp[64];
+    struct num_position_t **numbers, *tmp_pos;
+    numbers = (struct num_position_t**)malloc(MAX_NUMBERS * sizeof(struct num_position_t*));
+
+    int symbol_map[MAX_MAP_SIZE][MAX_MAP_SIZE];
+    memset(symbol_map, 0, MAX_MAP_SIZE*MAX_MAP_SIZE*sizeof(int));
+
+    int num_numbers = 0, num_length = 0;
+    unsigned int curr = 0;
+    int x = 0, y = 0;
+
+    buf = (char *)malloc(LINE_MAX_LENGTH);
+    memset(buf, 0, LINE_MAX_LENGTH);
+    p = buf;
+
+    int map_x = 0;
+    int map_y = 0;
+
+    while ((c = getchar()) != EOF) {
+        *p++ = c;
+        if (c == '\n') {
+            p = buf;
+            while (*p != '\n') {
+                if (*p == '-' || *p == '+') {
+                    symbol_map[x][y] = 1;
+                    p++;
+                    x++;
+                } else if (sscanf(p, "%u", &curr) != 0) {
+                    num_length = sprintf(tmp, "%u", curr);
+                    tmp_pos = create_position(x, y, num_length, curr);
+                    numbers[num_numbers] = tmp_pos;
+                    num_numbers++;
+                    p += num_length;
+                    x += num_length;
+                } else {
+                    if (*p != '.') {
+                        symbol_map[x][y] = 1;
+                    }
+                    if (*p == '*') {
+                        symbol_map[x][y] = 2;
+                    }
+                    p++;
+                    x++;
+                }
+            }
+            map_x = x;
+            x = 0;
+            y++;
+            memset(buf, 0, LINE_MAX_LENGTH);
+            p = buf;
+        }
+    }
+
+    map_y = y;
+
+    // Part 1
+    unsigned int part1 = 0;
+
+    for (int i = 0; i < num_numbers; i++) {
+        if (has_adjacent_symbol(numbers[i], symbol_map)) {
+            part1 += numbers[i]->value;
+        }
+    }
+
+    printf("%u\n", part1);
+
+    // Part 2
+    unsigned int part2 = 0;
+
+    for (int i = 0; i < map_y; i++) {
+        for (int j = 0; j < map_x; j++) {
+            if (symbol_map[j][i] == 2) {
+                part2 += gear_ratio(j, i, numbers, num_numbers);
+            }
+        }
+    }
+
+    printf("%u\n", part2);
+
+    free(buf);
+    for (int i = 0; i < num_numbers; i++) {
+        free(numbers[i]);
+    }
+    free(numbers);
+}
+
+struct num_position_t* create_position(int x, int y, int length, unsigned int value) {
+    struct num_position_t *pos;
+    pos = (struct num_position_t*)malloc(sizeof(struct num_position_t));
+    pos->x = x;
+    pos->y = y;
+    pos->length = length;
+    pos->value = value;
+    return pos;
+}
+
+int has_adjacent_symbol(struct num_position_t* number, int symbol_map[MAX_MAP_SIZE][MAX_MAP_SIZE]) {
+    int x, y;
+    for (int i = 0; i < number->length; i++) {
+        for (int j = -1; j <= 1; j++) {
+            for (int k = -1; k <= 1; k++) {
+                x = number->x + i + j;    
+                y = number->y + k;    
+                if (x < 0 || y < 0) continue;
+                if (symbol_map[x][y]) return 1;
+            }
+        }
+    }
+
+    return 0;
+}
+
+unsigned int gear_ratio(int x, int y, struct num_position_t** numbers, int num_numbers) {
+    int gear_num = 0;
+    unsigned int num_parts[2];
+    for (int i = 0; i < num_numbers; i++) {
+        for (int j = 0; j < numbers[i]->length; j++) {
+            if (abs(numbers[i]->x + j - x) <= 1 && abs(numbers[i]->y - y) <= 1) {
+                // Not a gear
+                if (gear_num == 2) return 0;
+                // Add gear
+                num_parts[gear_num] = numbers[i]->value;
+                gear_num++;
+                break;
+            }
+        }
+    }
+
+    if (gear_num == 2) {
+        return num_parts[0] * num_parts[1];
+    }
+
+    return 0;
+}

day3/input.txt

@@ -0,0 +1,140 @@
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day3/rust/.gitignore

@@ -0,0 +1 @@
+target

day3/rust/Cargo.lock

@@ -0,0 +1,7 @@
+# This file is automatically @generated by Cargo.
+# It is not intended for manual editing.
+version = 3
+
+[[package]]
+name = "rust"
+version = "0.1.0"

day3/rust/Cargo.toml

@@ -0,0 +1,8 @@
+[package]
+name = "rust"
+version = "0.1.0"
+edition = "2021"
+
+# See more keys and their definitions at https://doc.rust-lang.org/cargo/reference/manifest.html
+
+[dependencies]

day3/rust/src/main.rs

@@ -0,0 +1,160 @@
+struct Number {
+    value: usize,
+}
+
+enum Symbol {
+    Asterisk,
+    Other,
+}
+
+enum Tile<'a> {
+    Number(&'a Number),
+    Symbol(Symbol),
+    Period,
+}
+
+fn main() {
+    let stdin = std::io::stdin();
+
+    let mut map: Vec<Vec<Tile>> = Vec::new();
+
+    for line in stdin.lines() {
+        let line = line.unwrap();
+
+        let mut num = Vec::new();
+        let mut v = Vec::new();
+        for char in line.chars() {
+            if !char.is_digit(10) && num.len() > 0 {
+                let s: String = num.iter().collect();
+
+                let number = Box::leak(Box::new(Number {
+                    value: s.parse().unwrap(),
+                }));
+
+                for _ in 0..s.len() {
+                    v.push(Tile::Number(number));
+                }
+
+                num.clear();
+            }
+
+            if char == '.' {
+                v.push(Tile::Period);
+            } else if char == '*' {
+                v.push(Tile::Symbol(Symbol::Asterisk));
+            } else if char.is_digit(10) {
+                num.push(char);
+            } else {
+                v.push(Tile::Symbol(Symbol::Other));
+            }
+        }
+
+        if num.len() > 0 {
+            let s: String = num.iter().collect();
+
+            let number = Box::leak(Box::new(Number {
+                value: s.parse().unwrap(),
+            }));
+
+            for _ in 0..s.len() {
+                v.push(Tile::Number(number));
+            }
+        }
+        map.push(v);
+    }
+
+    // Part 1
+    let mut part1 = 0;
+
+    for (x, row) in map.iter().enumerate() {
+        let mut already_added = false;
+        for (y, tile) in row.iter().enumerate() {
+            match tile {
+                Tile::Number(number) => {
+                    if already_added {
+                        continue;
+                    };
+
+                    for dx in -1i32..=1 {
+                        for dy in -1i32..=1 {
+                            let ix = x.wrapping_add(dx as usize);
+                            let iy = y.wrapping_add(dy as usize);
+                            if let Some(v) = map.get(ix) {
+                                if let Some(Tile::Symbol(_)) = v.get(iy) {
+                                    already_added = true;
+                                    part1 += number.value;
+                                }
+                            }
+                            if already_added {
+                                break;
+                            };
+                        }
+                        if already_added {
+                            break;
+                        };
+                    }
+                }
+                _ => {
+                    if already_added {
+                        already_added = false;
+                    }
+                }
+            }
+        }
+    }
+
+    println!("{}", part1);
+
+    // Part 2
+    let mut part2 = 0;
+
+    for (x, row) in map.iter().enumerate() {
+        for (y, tile) in row.iter().enumerate() {
+            if let Tile::Symbol(Symbol::Asterisk) = tile {
+                let mut gears = [None; 2];
+                let mut gear_num = 0;
+                let mut skip = false;
+
+                for dx in -1i32..=1 {
+                    for dy in -1i32..=1 {
+                        let ix = x.wrapping_add(dx as usize);
+                        let iy = y.wrapping_add(dy as usize);
+                        if let Some(v) = map.get(ix) {
+                            if let Some(Tile::Number(number)) = v.get(iy) {
+                                if let Some(gear) = gears[0] {
+                                    if std::ptr::eq(gear, *number) {
+                                        continue;
+                                    }
+                                }
+                                if let Some(gear) = gears[1] {
+                                    if std::ptr::eq(gear, *number) {
+                                        continue;
+                                    }
+                                }
+
+                                if gear_num == 2 {
+                                    skip = true;
+                                    break;
+                                }
+
+                                gears[gear_num] = Some(*number);
+                                gear_num += 1;
+                            }
+                        }
+                    }
+                    if skip {
+                        break;
+                    }
+                }
+
+                if gear_num == 2 {
+                    unsafe {
+                        part2 += (*gears[0].unwrap()).value * (*gears[1].unwrap()).value;
+                    }
+                }
+            }
+        }
+    }
+
+    println!("{}", part2);
+}

day3/sample.txt

@@ -0,0 +1,10 @@
+467..114..
+...*......
+..35..633.
+......#...
+617*......
+.....+.58.
+..592.....
+......755.
+...$.*....
+.664.598..

day4/c/day4.c

@@ -0,0 +1,88 @@
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+
+#define LINE_MAX_LENGTH 256
+#define MAX_WINNING_NUMBERS 16
+#define MAX_SCRATCHED_NUMBERS 64
+#define MAX_FORESIGHT (MAX_WINNING_NUMBERS+1)
+#define NUM_0_CHARCODE 48
+#define NUM_9_CHARCODE NUM_0_CHARCODE + 9
+
+int read_numbers(char *p, char endchar, int dest[]) {
+    int count = 0;
+    while (*p != endchar && *(p+1) != endchar) {
+        // Advance till first digit
+        while (*p < NUM_0_CHARCODE || *p > NUM_9_CHARCODE) p++;
+        // Read number
+        sscanf(p, "%i", &dest[count]);
+        count++;
+        // Advance till endchar or separator
+        while (*p != ' ' && *p != endchar) p++;
+    }
+
+    return count;
+}
+
+int main() {
+    char *p, *buf, c;
+    int card_id;
+    int part1 = 0;
+
+    buf = (char *)malloc(LINE_MAX_LENGTH);
+    memset(buf, 0, LINE_MAX_LENGTH);
+    p = buf;
+
+    int winning_numbers[MAX_WINNING_NUMBERS], winning_numbers_num = 0;
+    int scratched_numbers[MAX_SCRATCHED_NUMBERS], scratched_numbers_num = 0;
+
+    int foresight[MAX_FORESIGHT], sum_scratchcards = 0;
+    memset(foresight, 0, MAX_FORESIGHT * sizeof(foresight[0]));
+
+    while ((c = getchar()) != EOF) {
+        *p++ = c;
+        if (c == '\n') {
+            p = buf;
+            sscanf(p, "Card %i", &card_id);
+
+            int num_cards = 1 + foresight[0];
+            sum_scratchcards += num_cards;
+
+            for (int i = 0; i < MAX_FORESIGHT-1; i++) {
+                foresight[i] = foresight[i+1];
+            }
+
+            // Advance till ':'
+            while (*p++ != ':');
+
+            winning_numbers_num = read_numbers(p, '|', winning_numbers);
+
+            while (*p++ != '|');
+
+            scratched_numbers_num = read_numbers(p, '\n', scratched_numbers);
+
+            int points = 0;
+            int scratchcards_won = 0;
+            for (int i = 0; i < scratched_numbers_num; i++) {
+                for (int j = 0; j < winning_numbers_num; j++) {
+                    if (scratched_numbers[i] == winning_numbers[j])  {
+                        points = points ? points * 2 : 1;
+                        scratchcards_won++;
+                    }
+                }
+            }
+
+            for (int i = 0; i < scratchcards_won; i++) {
+                foresight[i] += num_cards;
+            }
+            part1 += points;
+
+            memset(buf, 0, LINE_MAX_LENGTH);
+            p = buf;
+        }
+    }
+
+    free(buf);
+    printf("%i\n", part1);
+    printf("%i\n", sum_scratchcards);
+}

day4/input.txt

@@ -0,0 +1,190 @@
+Card   1:  2 15 17 11 64 59 45 41 61 19 |  4 36 62 43 94 41 24 25 13 83 97 86 61 90 67  7 15 58 18 19 38 17 49 52 37
+Card   2: 41 62 67 93 88 12 78 51 95 49 | 55 63 89 78 45 11 62 50 81  9 32 82 15 36 74 54  4 58  5 56 44 83 90 49 34
+Card   3: 51 22 38 33 85 23 56 76 60 93 | 94 40 61 37 38 82 93 96 13 50 81 65 56 26  4 18 86 30  8 16 60 27 23 48 51
+Card   4: 51  6 90 10 97 65 19 17 24  3 | 93 82 10 13 17  3 90 74 14  7 77 38 70 97 72 60  6 79 65 94 24 19 51 45 28
+Card   5: 76 61 43 95 41  2 40 58 30 96 | 72 23 69  5 30  3 10 17 78 20 13 86 60 81 90 46 96 39  6 32 31 73 65 95 62
+Card   6: 32 70 49 99 27 26 75 96 91  4 | 15 74 28  2 17 82 55 96 88 11 95 77 12 38 91  3 56 44  7 32 19 94 85 27 97
+Card   7: 38 21 90 66 46 32 55 94 72 75 |  3 10 90 77 41 99 46 82 65 72  9 21 66 94 80 22 97 56 93 61 18 81 34 76 64
+Card   8: 32 36 87 79  4 17  1 77 16 63 |  9 63 23 25 91 82 35 74 28 72  6 52 56 12 39 99 57 46 15 76 85  2 75 77 96
+Card   9: 42  5 58 80 96 88 37 30 49 69 | 26  6 17 71 46 51 45 10 62 33 38 23 42 74 50 61 95 11 93 57 14 22 72 85 86
+Card  10: 10 74 58 71 57 35 34 96 77 18 | 14 27 22 18 70 42 56 94 76 74 85 73 61 34 88 45 39 64 35 87 90 58 91 75 54
+Card  11: 24 26 43 62 66 93 38 51 95 86 | 31 75 23 91 12  3 90  9 36 87 76 58 40 35 56 65 17 74 61 93 20 71 82 92 73
+Card  12:  2 25 63 37 64 81 20 15 28 88 | 67 26 12  6 58 37 69 93 83 52 81 25 19 30 80 54 73 21 86 20  8 57 47 32 60
+Card  13: 48 37 14 80 51 17 85 26 40 33 | 80  7 79 38  8 74 10 78 89 16 81 84 19 49 86 83 63 82 40 58 25 47 53 34  4
+Card  14: 93 27  7 80 63 89 50 96  3 15 |  6 19 40 46 51 29  9 86 39 77  4 54 38 41 67 69  1 56  5 35 30 17 71  2 43
+Card  15: 33 72 28 75 56 22 16 38 44 51 | 81 67 79 73 52 40 69 43 12 77 31 41 23 14 64 58  5 88 95 13 99  6 42 83 38
+Card  16: 36 82 59 39 57 26 61 45 60 65 | 66 51 24  1  4 78 17 16 74 95 34 47 75  6 67 44 48 14 10 89 46  2 31 18 68
+Card  17: 40 50 36  8 54 17 29 13 89 98 |  6 59 60 57 18 30 80 32 46 77 86 35 48 84 91  4 38 99 17 33  3 15 82 83 62
+Card  18: 81 11 66 67 19 65 39 64 20  9 | 25 14 60  2 50 97 43 18 36 24 89 74 94 71 51 45  5 34 52 31 90  6 48 40 55
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day4/rust/.gitignore

@@ -0,0 +1 @@
+target

day4/rust/Cargo.lock

@@ -0,0 +1,7 @@
+# This file is automatically @generated by Cargo.
+# It is not intended for manual editing.
+version = 3
+
+[[package]]
+name = "rust"
+version = "0.1.0"

day4/rust/Cargo.toml

@@ -0,0 +1,8 @@
+[package]
+name = "rust"
+version = "0.1.0"
+edition = "2021"
+
+# See more keys and their definitions at https://doc.rust-lang.org/cargo/reference/manifest.html
+
+[dependencies]

day4/rust/src/main.rs

@@ -0,0 +1,84 @@
+use std::collections::VecDeque;
+
+struct Card {
+    _id: usize,
+    winning_numbers: Vec<usize>,
+    scratched_numbers: Vec<usize>,
+}
+
+fn main() {
+    let stdin = std::io::stdin();
+
+    let mut cards = Vec::new();
+
+    for line in stdin.lines() {
+        let line = line.unwrap();
+
+        let (card_id_str, numbers) = line.split_once(':').unwrap();
+
+        let card_id = card_id_str
+            .split_once(' ')
+            .unwrap()
+            .1
+            .trim()
+            .parse()
+            .unwrap();
+
+        let (winning_numbers_str, scratched_numbers_str) = numbers.split_once('|').unwrap();
+
+        let winning_numbers = winning_numbers_str
+            .split(' ')
+            .filter(|e| e.len() > 0)
+            .map(|e| e.parse().unwrap())
+            .collect();
+
+        let scratched_numbers = scratched_numbers_str
+            .split(' ')
+            .filter(|e| e.len() > 0)
+            .map(|e| e.parse().unwrap())
+            .collect();
+
+        cards.push(Card {
+            _id: card_id,
+            winning_numbers,
+            scratched_numbers,
+        });
+    }
+
+    let mut part1 = 0;
+    let mut part2 = 0;
+
+    let mut foresight = VecDeque::new();
+
+    for card in &cards {
+        let mut score = 0;
+        let mut win_num = 0;
+
+        let card_num = foresight.pop_front().unwrap_or(0) + 1;
+        part2 += card_num;
+
+        for scratched_number in &card.scratched_numbers {
+            if card.winning_numbers.contains(&scratched_number) {
+                win_num += 1;
+                if score == 0 {
+                    score = 1;
+                } else {
+                    score *= 2;
+                }
+            }
+        }
+
+        for i in 0..win_num {
+            if let Some(n) = foresight.get(i) {
+                foresight[i] = n + card_num;
+            } else {
+                foresight.push_back(card_num);
+            }
+        }
+
+        part1 += score;
+    }
+
+    println!("{}", part1);
+    println!("{}", part2);
+}

day4/sample.txt

@@ -0,0 +1,6 @@
+Card 1: 41 48 83 86 17 | 83 86  6 31 17  9 48 53
+Card 2: 13 32 20 16 61 | 61 30 68 82 17 32 24 19
+Card 3:  1 21 53 59 44 | 69 82 63 72 16 21 14  1
+Card 4: 41 92 73 84 69 | 59 84 76 51 58  5 54 83
+Card 5: 87 83 26 28 32 | 88 30 70 12 93 22 82 36
+Card 6: 31 18 13 56 72 | 74 77 10 23 35 67 36 11

day5/c/day5.c

@@ -0,0 +1,196 @@
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+#include <limits.h>
+#include <omp.h>
+
+#define LINE_MAX_LENGTH 512
+#define MAX_RANGE_PER_MAPPING 64
+#define MAX_MAPPINGS 64
+#define MAX_SEEDS 128
+#define NUM_0_CHARCODE 48
+#define NUM_9_CHARCODE NUM_0_CHARCODE + 9
+
+const char* resources[] = {
+    "seed",
+    "soil",
+    "fertilizer",
+    "water",
+    "light",
+    "temperature",
+    "humidity",
+    "location"
+};
+
+#define RESOURCES_LEN (sizeof(resources) / sizeof(resources[0]))
+
+struct mapping {
+    unsigned long source;
+    unsigned long destination;
+    unsigned long mappings[MAX_RANGE_PER_MAPPING][3];
+    int mapping_num;
+};
+
+struct mapping* create_mapping(unsigned long src, unsigned long dst);
+
+int main() {
+    char *p, *buf, c;
+    int firstline = 1, seed_num = 0;
+    unsigned long seeds[MAX_SEEDS];
+
+    struct mapping **mappings;
+    int mappings_num = 0;
+
+    mappings = (struct mapping**)malloc(MAX_MAPPINGS * sizeof(struct mapping*));
+
+    buf = (char *)malloc(LINE_MAX_LENGTH);
+    memset(buf, 0, LINE_MAX_LENGTH);
+    p = buf;
+
+    int src = 0, dst = 0;
+    struct mapping *curr;
+
+    while ((c = getchar()) != EOF) {
+        *p++ = c;
+        if (c == '\n') {
+            if (firstline) {
+                if (buf[0] == '\n') {
+                    firstline = 0;
+                    memset(buf, 0, LINE_MAX_LENGTH);
+                    p = buf;
+                    continue;
+                }
+
+                p = buf;
+                while (*p < NUM_0_CHARCODE || *p > NUM_9_CHARCODE) p++;
+                while (*p != '\0') {
+                    sscanf(p, "%lu", &seeds[seed_num]);
+                    seed_num++;
+
+                    while (*p != ' ' && *p != '\n') p++;
+                    p++;
+                }
+                memset(buf, 0, LINE_MAX_LENGTH);
+                p = buf;
+                continue;
+            }
+
+            if (src == dst) {
+                char tmp1[64], tmp2[64];
+                memset(tmp1, 0 , 64);
+                memset(tmp2, 0 , 64);
+                sscanf(buf, "%[^-]-to-%s map", tmp1, tmp2);
+
+                for (unsigned long i = 0; i < RESOURCES_LEN; i++) {
+                    if (strcmp(tmp1, resources[i]) == 0) {
+                        src = i;
+                    }
+                    if (strcmp(tmp2, resources[i]) == 0) {
+                        dst = i;
+                    }
+                }
+                curr = create_mapping(src, dst);
+            } else if (buf[0] == '\n') {
+                mappings[mappings_num] = curr;
+                mappings_num++;
+                src = dst = 0;
+            } else {
+                unsigned long src_start, dst_start, range;
+                sscanf(buf, "%lu %lu %lu", &dst_start, &src_start, &range); 
+                curr->mappings[curr->mapping_num][0] = dst_start;
+                curr->mappings[curr->mapping_num][1] = src_start;
+                curr->mappings[curr->mapping_num][2] = range;
+                curr->mapping_num++;
+            }
+
+            memset(buf, 0, LINE_MAX_LENGTH);
+            p = buf;
+        }
+    }
+    mappings[mappings_num] = curr;
+    mappings_num++;
+
+    // Part 1
+
+    unsigned long part1 = ULONG_MAX;
+    int location_idx = 7;
+    
+    for (int i = 0; i < seed_num; i++) {
+        int cur_resource = 0;
+        unsigned long cur_value = seeds[i];
+        while (cur_resource != location_idx) {
+            for (int j = 0; j < mappings_num; j++) {
+                if (cur_resource != mappings[j]->source) {
+                    continue;
+                }
+
+                for (int k = 0; k < mappings[j]->mapping_num; k++) {
+                    if (cur_value >= mappings[j]->mappings[k][1] && cur_value < mappings[j]->mappings[k][1] + mappings[j]->mappings[k][2]) {
+                        cur_value = mappings[j]->mappings[k][0] + (cur_value - mappings[j]->mappings[k][1]);
+                        break;
+                    }
+                }
+
+                cur_resource = mappings[j]->destination;
+            }
+        }
+
+        if (part1 > cur_value) {
+            part1 = cur_value;
+        }
+    }
+
+    printf("%lu\n", part1);
+
+    // Part 2
+
+    unsigned long part2 = ULONG_MAX;
+
+    // I know it could be done more efficiently than checking every single number but it only runs
+    // for about an hour an a single core so if I use all 12 threads in my machine it only takes 5 mins
+    for (int i = 0; i < seed_num; i+=2) {
+#pragma omp parallel for
+        for (unsigned long s = seeds[i]; s < seeds[i] + seeds[i+1]; s++) {
+            int cur_resource = 0;
+            unsigned long cur_value = s;
+            while (cur_resource != location_idx) {
+                for (int j = 0; j < mappings_num; j++) {
+                    if (cur_resource != mappings[j]->source) {
+                        continue;
+                    }
+
+                    for (int k = 0; k < mappings[j]->mapping_num; k++) {
+                        if (cur_value >= mappings[j]->mappings[k][1] && cur_value < mappings[j]->mappings[k][1] + mappings[j]->mappings[k][2]) {
+                            cur_value = mappings[j]->mappings[k][0] + (cur_value - mappings[j]->mappings[k][1]);
+                            break;
+                        }
+                    }
+
+                    cur_resource = mappings[j]->destination;
+                }
+            }
+
+#pragma omp critical
+            if (part2 > cur_value) {
+                part2 = cur_value;
+            }
+        }
+    }
+
+    printf("%lu\n", part2);
+
+    free(buf);
+    for (int i = 0; i < mappings_num; i++) {
+        free(mappings[i]);
+    }
+    free(mappings);
+}
+
+struct mapping* create_mapping(unsigned long src, unsigned long dst) {
+    struct mapping *mapping;
+    mapping = (struct mapping*)malloc(sizeof(struct mapping));
+    memset(mapping, 0, sizeof(struct mapping));
+    mapping->source = src;
+    mapping->destination = dst;
+    return mapping;
+}

day5/input.txt

@@ -0,0 +1,197 @@
+seeds: 3127166940 109160474 3265086325 86449584 1581539098 205205726 3646327835 184743451 2671979893 17148151 305618297 40401857 2462071712 203075200 358806266 131147346 1802185716 538526744 635790399 705979250
+
+seed-to-soil map:
+931304316 1786548802 232453384
+3500539319 2322065235 6421609
+496396007 147739714 266329192
+3169724489 768672891 39526579
+3689153715 1361862036 346985
+1936948751 3328259881 542896984
+3209251068 3154345676 173914205
+1163757700 2814318523 24125066
+2484210664 1362209021 231487475
+3991904247 2133571422 188493813
+1187882766 4045525873 83717994
+861951350 3084992710 69352966
+2715698139 2838443589 43714032
+3830303258 4025104215 20421658
+768672891 1268583577 93278459
+4180398060 2019002186 114569236
+3689500700 1593696496 10659519
+1271600760 808199470 460384107
+166497091 526585653 102729094
+3700160219 3894961176 130143039
+2966889400 2882157621 202835089
+147739714 414068906 18757377
+3850724916 4133608796 141179331
+2759412171 2328486844 183672918
+2479845735 4129243867 4364929
+3480360150 4274788127 20179169
+402636637 432826283 93759370
+3383165273 2717123646 97194877
+3506960928 1604356015 182192787
+269226185 629314747 133410452
+2943085089 3871156865 23804311
+1731984867 2512159762 204963884
+
+soil-to-fertilizer map:
+3368312743 826425240 243745914
+1045038113 3682756471 174490549
+3931158487 1530223690 363808809
+1219528662 2460222182 131099318
+3020480207 1894032499 63879875
+121779694 248970341 36319877
+1993634034 2662348686 86667553
+3612058657 1323325837 196530127
+1531175223 2604354699 57993987
+158099571 121779694 127190647
+1867147432 3317666386 126486602
+2080301587 2768963716 548702670
+1402482267 1070171154 21180243
+2959841028 4051272297 60639179
+834756529 1966243663 128160296
+3911211010 2749016239 19947477
+962916825 3857247020 82121288
+2629004257 3444152988 238603483
+826425240 1957912374 8331289
+1350627980 3939368308 51854287
+1589169210 4214533702 80433594
+2867607740 2094403959 92233288
+1669602804 1125781209 197544628
+3084360082 1519855964 10367726
+1483712212 1091351397 34429812
+3094727808 2186637247 273584935
+1423662510 3991222595 60049702
+3808588784 4111911476 102622226
+1518142024 2591321500 13033199
+
+fertilizer-to-water map:
+206818393 1973789958 18543481
+2641351404 1992333439 41420268
+58400970 2574944960 107826712
+3710426911 4065366707 42793360
+4217161704 4274048011 20919285
+1926695368 705931711 328031436
+1449580741 1210970895 50549447
+907984567 1421828853 15115545
+769748018 1108192216 102778679
+451427938 35457870 38201654
+2254726804 2033892789 137829519
+923239194 1513967644 270588891
+3753220271 4108160067 165887944
+499804857 310274559 109862756
+3061525238 3535532059 426476055
+1193828085 73659524 196024324
+872526697 0 35457870
+1766386857 1261520342 160308511
+4057593930 3283950856 159567774
+1389852409 646203379 59728332
+3919108215 3962008114 103358593
+1577153434 1784556535 189233423
+4022466808 3443518630 35127122
+489629592 1098016951 10175265
+923100112 2033753707 139082
+2392556323 2390203683 158894869
+1500130188 1436944398 77023246
+2577297600 1033963147 64053804
+609667613 2171722308 160080405
+3488001293 3061525238 222425618
+2551451192 2549098552 25846408
+4238080989 3478645752 56886307
+166227682 269683848 40590711
+0 2331802713 58400970
+225361874 420137315 226066064
+
+water-to-light map:
+1833244152 0 764535859
+212138399 2132863085 224047237
+445686952 1600446740 163005122
+3322180377 2914685303 488586806
+2739726430 3712513349 582453947
+3946546331 3589340640 8839399
+1441711040 799272484 245821386
+1038755613 1763451862 6623730
+608692074 1587251997 13194743
+701103180 2356910322 39153476
+1687532426 1045093870 145711726
+2597780011 764535859 34736625
+740256656 1490869662 54307168
+0 1920724686 212138399
+2632516636 1545176830 9229765
+668257778 1554406595 32845402
+3955385730 2739726430 39179725
+4180633986 3598180039 114333310
+3810767183 2778906155 135779148
+1291061946 1770075592 150649094
+436185636 1481368346 9501316
+1045379343 2396063798 245682603
+794563824 1237176557 244191789
+621886817 1190805596 46370961
+3994565455 3403272109 186068531
+
+light-to-temperature map:
+432141642 1268486741 19474646
+3617581823 3276436954 357008111
+3505110084 3786131308 49942802
+0 1287961387 432141642
+3096011130 1808659179 409098954
+1347993824 2675880000 161612192
+3019335150 3199760974 76675980
+3555052886 3137232037 62528937
+2778092757 1720103029 88556150
+451616288 2217758133 458121867
+1509606016 0 1268486741
+909738155 3836074110 138515824
+1048253979 2837492192 299739845
+2866648907 3633445065 152686243
+
+temperature-to-humidity map:
+646729740 1519504972 559297346
+1894539176 2990410634 44298872
+232257988 972432123 414471752
+2277879451 278205785 108711195
+1775790220 132298732 118748956
+3371687162 2663455233 326955401
+1612056920 272509895 5695890
+1208383109 3703499740 147415518
+4070380190 4053129082 69974785
+4155541210 3305585510 139426086
+81956384 386916980 150301604
+3987543096 896459472 75972651
+2148980475 1386903875 128898976
+1617752810 3445011596 154599732
+4063515747 2078802318 6864443
+2392568787 3599611328 101532389
+2386590646 4123103867 5978141
+2494101176 2122546980 187027686
+2681128862 2085666761 36880219
+4140354975 2648268998 15186235
+1772352542 3051742077 3437678
+1355798627 3850915258 202213824
+3720104770 3055179755 250405755
+3032992830 2309574666 338694332
+1206027086 3701143717 2356023
+1938838048 537218584 44257139
+1558012451 81956384 50342348
+3970510525 3034709506 17032571
+1608354799 1515802851 3702121
+1983095187 4129082008 165885288
+3698642563 251047688 21462207
+2718009081 581475723 314983749
+
+humidity-to-location map:
+971626884 4275486551 19480745
+1218249913 2090555906 502249162
+2914848039 2902831882 224865747
+3341591733 2819947352 82884530
+991107629 2592805068 227142284
+3424476263 606585628 95279547
+4279176998 2064757318 10971709
+3139713786 4068790015 201877947
+606585628 701865175 365041256
+3534582689 3291885426 744594309
+1916997152 1066906431 997850887
+1752809355 3127697629 164187797
+1720499075 4036479735 32310280
+4290148707 4270667962 4818589
+3519755810 2075729027 14826879

day5/rust/.gitignore

@@ -0,0 +1 @@
+target

day5/rust/Cargo.lock

@@ -0,0 +1,7 @@
+# This file is automatically @generated by Cargo.
+# It is not intended for manual editing.
+version = 3
+
+[[package]]
+name = "rust"
+version = "0.1.0"

day5/rust/Cargo.toml

@@ -0,0 +1,8 @@
+[package]
+name = "rust"
+version = "0.1.0"
+edition = "2021"
+
+# See more keys and their definitions at https://doc.rust-lang.org/cargo/reference/manifest.html
+
+[dependencies]