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Day12

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Dobos Ádám
2022-12-12 20:43:22 +01:00
parent c75abf3ea1
commit 3079ea69fd
3 changed files with 266 additions and 0 deletions
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day12/elevation Executable file
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day12/elevation.c Normal file
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#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#define BUFFER_SIZE 256
#define FIFO_MAX 1000
#define PATH_MAX FIFO_MAX
#define CLIMB_THRESHOLD 1
int explore(int [*][*][2], int, int, int*, int, int, char[*][*], int, int);
struct fifoentry {
};
// Store in a fifo what to explore and where did it come from
unsigned fifo[FIFO_MAX][4], fifo_tail = 0;
int main() {
char c;
int map_width = -1, col = 0, row = 0;
// It would be very impractical to dynamically try to allocate memory because
// we would have to collect the first row into a separate buffer and then copy it
// to our dynamically allocated array after reading the first row
char map[BUFFER_SIZE][BUFFER_SIZE];
int startPos[2], endPos[2];
while ((c = getchar()) != EOF) {
if (c == '\n') {
if (map_width == -1) map_width = col;
row++;
} else {
if (c == 'S') {
startPos[0] = col;
startPos[1] = row;
map[col][row] = 'a';
} else if (c == 'E') {
endPos[0] = col;
endPos[1] = row;
map[col][row] = 'z';
} else {
map[col][row] = c;
}
}
if (col == map_width) {
col = 0;
} else {
col++;
}
}
printf("Cols: %i, Rows: %i, Start: %i:%i, End: %i:%i\n", map_width, row, startPos[0], startPos[1], endPos[0], endPos[1]);
int visited[BUFFER_SIZE][BUFFER_SIZE][2];
for (int i = 0; i < row; i++) {
for (int j = 0; j < map_width; j++) {
visited[j][i][0] = -1;
visited[j][i][1] = -1;
}
}
// Let's climb
// We will have a FIFO, we pop the next move, and push all new paths to the end
// This way we will find the shortest path
int path_found = 0;
fifo[fifo_tail][0] = startPos[0];
fifo[fifo_tail][1] = startPos[1];
fifo[fifo_tail][2] = -2;
fifo[fifo_tail][3] = -2;
fifo_tail++;
while (!path_found) {
// Pop from the queue
int cCol = fifo[0][0];
int cRow = fifo[0][1];
int cFromCol = fifo[0][2];
int cFromRow = fifo[0][3];
for (int i = 0; i < fifo_tail - 1; i++) {
fifo[i][0] = fifo[i+1][0];
fifo[i][1] = fifo[i+1][1];
fifo[i][2] = fifo[i+1][2];
fifo[i][3] = fifo[i+1][3];
}
fifo_tail--;
// Explore the head
if (explore(visited, cCol, cRow, endPos, map_width, row, map, cFromCol, cFromRow)) {
path_found = 1;
}
}
// Now we have to backtrack
int numSteps = 0, last[2] = {visited[endPos[0]][endPos[1]][0], visited[endPos[0]][endPos[1]][1]};
while (last[0] != -2) {
int tmp[2] = {last[0], last[1]};
last[0] = visited[tmp[0]][tmp[1]][0];
last[1] = visited[tmp[0]][tmp[1]][1];
numSteps++;
}
printf("Steps from START: %i\n", numSteps);
// It will be at max numSteps
int minSteps = numSteps;
// Do this again with every 'a' point for part 2
// I just copy the code in a for loop, I ain't refactoring this
for (int i = 0; i < row; i++) {
for (int j = 0; j < map_width; j++) {
if (map[j][i] != 'a') {
continue;
}
startPos[0] = j;
startPos[1] = i;
// Reset visited
for (int i = 0; i < row; i++) {
for (int j = 0; j < map_width; j++) {
visited[j][i][0] = -1;
visited[j][i][1] = -1;
}
}
// Reset FIFO
path_found = 0, fifo_tail = 0;
fifo[fifo_tail][0] = startPos[0];
fifo[fifo_tail][1] = startPos[1];
fifo[fifo_tail][2] = -2;
fifo[fifo_tail][3] = -2;
fifo_tail++;
while (!path_found) {
// Pop from the queue
int cCol = fifo[0][0];
int cRow = fifo[0][1];
int cFromCol = fifo[0][2];
int cFromRow = fifo[0][3];
for (int i = 0; i < fifo_tail - 1; i++) {
fifo[i][0] = fifo[i+1][0];
fifo[i][1] = fifo[i+1][1];
fifo[i][2] = fifo[i+1][2];
fifo[i][3] = fifo[i+1][3];
}
fifo_tail--;
// Explore the head
if (explore(visited, cCol, cRow, endPos, map_width, row, map, cFromCol, cFromRow)) {
path_found = 1;
}
// We cannot traverse further, this is a dead end
if (fifo_tail == 0)
break;
}
// There might be cases when there isn't a path
if (path_found) {
numSteps = 0;
last[0] = visited[endPos[0]][endPos[1]][0];
last[1] = visited[endPos[0]][endPos[1]][1];
while (last[0] != -2) {
int tmp[2] = {last[0], last[1]};
last[0] = visited[tmp[0]][tmp[1]][0];
last[1] = visited[tmp[0]][tmp[1]][1];
numSteps++;
}
if (numSteps < minSteps) {
minSteps = numSteps;
}
}
}
}
printf("Min Steps: %i\n", minSteps);
}
int explore(int visited[BUFFER_SIZE][BUFFER_SIZE][2], int col, int row, int* end, int mapWidth, int mapHeight, char map[BUFFER_SIZE][BUFFER_SIZE], int fromCol, int fromRow) {
if (visited[col][row][0] != -1) {
return 0;
}
visited[col][row][0] = fromCol;
visited[col][row][1] = fromRow;
if (col == end[0] && row == end[1]) {
return 1;
}
if (col < mapWidth - 1 && map[col + 1][row] <= map[col][row] + CLIMB_THRESHOLD) {
fifo[fifo_tail][0] = col + 1;
fifo[fifo_tail][1] = row;
fifo[fifo_tail][2] = col;
fifo[fifo_tail][3] = row;
fifo_tail++;
}
if (col > 0 && map[col - 1][row] <= map[col][row] + CLIMB_THRESHOLD) {
fifo[fifo_tail][0] = col - 1;
fifo[fifo_tail][1] = row;
fifo[fifo_tail][2] = col;
fifo[fifo_tail][3] = row;
fifo_tail++;
}
if (row < mapHeight - 1 && map[col][row + 1] <= map[col][row] + CLIMB_THRESHOLD) {
fifo[fifo_tail][0] = col;
fifo[fifo_tail][1] = row + 1;
fifo[fifo_tail][2] = col;
fifo[fifo_tail][3] = row;
fifo_tail++;
}
if (row > 0 && map[col][row - 1] <= map[col][row] + CLIMB_THRESHOLD) {
fifo[fifo_tail][0] = col;
fifo[fifo_tail][1] = row - 1;
fifo[fifo_tail][2] = col;
fifo[fifo_tail][3] = row;
fifo_tail++;
}
return 0;
}

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day12/input.txt Normal file
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