Day23 C
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dobiadi
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day23/c/day23
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day23/c/day23
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day23/c/day23.c
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day23/c/day23.c
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#include <stdio.h>
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#include <stdlib.h>
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#include <string.h>
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#include <stdint.h>
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#define LINE_MAX_LENGTH 256
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#define MAX_QUEUE 256*256
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#define cmp(a,b) ((a)[0] == (b)[0] && (a)[1] == (b)[1])
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#define abs(a) ((a) < 0 ? -(a) : (a))
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typedef enum tile_type {
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PATH,
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FOREST,
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SLOPE_UP,
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SLOPE_DOWN,
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SLOPE_LEFT,
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SLOPE_RIGHT,
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} tile_type_t;
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int check_direction(int curr[2], int dir[2], uint8_t **visited, tile_type_t map[LINE_MAX_LENGTH][LINE_MAX_LENGTH]);
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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);
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int curr_max = 0;
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int directions[4][2] = {
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{0, -1},
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{0, 1},
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{-1, 0},
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{1, 0}
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};
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int main() {
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char *p, *buf, c;
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buf = (char *)malloc(LINE_MAX_LENGTH);
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memset(buf, 0, LINE_MAX_LENGTH);
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p = buf;
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tile_type_t map[LINE_MAX_LENGTH][LINE_MAX_LENGTH];
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int x = 0, y = 0;
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int walkable = 0;
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while ((c = getchar()) != EOF) {
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*p++ = c;
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if (c == '\n') {
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p = buf;
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x = 0;
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while (*p != '\n') {
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switch (*p) {
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case '.':
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map[x][y] = PATH;
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walkable++;
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break;
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case '#':
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map[x][y] = FOREST;
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break;
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case '^':
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map[x][y] = SLOPE_UP;
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walkable++;
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break;
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case 'v':
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map[x][y] = SLOPE_DOWN;
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walkable++;
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break;
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case '<':
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map[x][y] = SLOPE_LEFT;
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walkable++;
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break;
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case '>':
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map[x][y] = SLOPE_RIGHT;
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walkable++;
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break;
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}
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x++;
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p++;
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}
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y++;
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memset(buf, 0, LINE_MAX_LENGTH);
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p = buf;
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}
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}
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int start[2], finish[2];
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start[1] = 0;
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finish[1] = y - 1;
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// Find start and finish
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for (int i = 0; i < x; i++) {
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if (map[i][0] == PATH) {
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start[0] = i;
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}
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if (map[i][y - 1] == PATH) {
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finish[0] = i;
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}
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}
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uint8_t **visited = (uint8_t**)malloc(x * sizeof(uint8_t*));
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for (uint8_t i = 0; i < x; i++) {
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visited[i] = (uint8_t*)malloc(y * sizeof(uint8_t));
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memset(visited[i], 0, y * sizeof(uint8_t));
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}
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printf("Part 1: %i\n", highest_cost(start, map, x, y, visited, 0, finish, 0, walkable));
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for (uint8_t i = 0; i < x; i++) {
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memset(visited[i], 0, y * sizeof(uint8_t));
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}
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printf("Part 2: %i\n", highest_cost(start, map, x, y, visited, 0, finish, 1, walkable));
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free(buf);
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for (int i = 0; i < y; i++) {
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free(visited[i]);
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}
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free(visited);
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}
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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) {
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if (cmp(curr, finish)) {
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return cost;
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}
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// We will never reach the end
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if ((walkable - cost) < (abs(finish[0] - curr[0]) + abs(finish[1] - curr[1])) || visited[finish[0]][finish[1]-1]) {
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return -1;
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}
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visited[curr[0]][curr[1]] = 1;
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int *options[4], options_num = 0, *dir, max = 0;
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if (map[curr[0]][curr[1]] == SLOPE_UP && !ignore_slopes) {
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dir = directions[0];
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if (check_direction(curr, dir, visited, map)) {
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options[0] = dir;
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options_num = 1;
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}
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} else if (map[curr[0]][curr[1]] == SLOPE_DOWN && !ignore_slopes) {
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dir = directions[1];
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if (check_direction(curr, dir, visited, map)) {
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options[0] = dir;
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options_num = 1;
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}
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} else if (map[curr[0]][curr[1]] == SLOPE_LEFT && !ignore_slopes) {
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dir = directions[2];
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if (check_direction(curr, dir, visited, map)) {
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options[0] = dir;
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options_num = 1;
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}
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} else if (map[curr[0]][curr[1]] == SLOPE_RIGHT && !ignore_slopes) {
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dir = directions[3];
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if (check_direction(curr, dir, visited, map)) {
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options[0] = dir;
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options_num = 1;
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}
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} else {
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for (int i = 0; i < 4; i++) {
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int *dir = directions[i];
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if (check_direction(curr, dir, visited, map)) {
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options[options_num] = dir;
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options_num++;
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}
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}
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}
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if (options_num == 0) {
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return -1;
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}
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uint8_t ***visited_copies = (uint8_t***)malloc(options_num * sizeof(uint8_t**));
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for (uint8_t i = 0; i < options_num - 1; i++) {
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visited_copies[i] = (uint8_t**)malloc(x * sizeof(uint8_t*));
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for (uint8_t j = 0; j < y; j++) {
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visited_copies[i][j] = (uint8_t*)malloc(y * sizeof(uint8_t));
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memcpy(visited_copies[i][j], visited[j], y * sizeof(uint8_t));
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}
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}
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for (int i = 0; i < options_num; i++) {
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int next[2];
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next[0] = curr[0] + options[i][0];
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next[1] = curr[1] + options[i][1];
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int c;
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if (i != options_num - 1) {
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c = highest_cost(next, map, x, y, visited_copies[i], cost + 1, finish, ignore_slopes, walkable);
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} else {
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c = highest_cost(next, map, x, y, visited, cost + 1, finish, ignore_slopes, walkable);
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}
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if (c > max) {
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max = c;
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}
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}
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for (int i = 0; i < options_num - 1; i++) {
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for (int j = 0; j < y; j++) {
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free(visited_copies[i][j]);
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}
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free(visited_copies[i]);
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}
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free(visited_copies);
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if (max > curr_max) {
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curr_max = max;
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printf("Current best: %i\n", curr_max);
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}
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return max;
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}
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int check_direction(int curr[2], int dir[2], uint8_t **visited, tile_type_t map[LINE_MAX_LENGTH][LINE_MAX_LENGTH]) {
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int next_x = curr[0] + dir[0];
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int next_y = curr[1] + dir[1];
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if (next_y > 0 && !visited[next_x][next_y] && map[next_x][next_y] != FOREST) {
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return 1;
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}
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return 0;
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}
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141
day23/input.txt
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day23/input.txt
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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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#####.#.#.#.###.#.#.#####.###.#.#.#.#.#####.#.###.#####.#.#.#########.#######.#.#.#.###.#.#.#.#.#.#.#####.#.###.#.#.###.#.###.#.#######.#####
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#.....#.#.#.###...#.#...#.#...#.#.#...#.....#.#...#...#.#.#.###.....#.....#...#.#.#.#...#.#.#.#.#.#...###.#...#.#.#...#...#...#.....#...#...#
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#.#####.#.#.#######.#.#.#.#.###.#.#####.#####.#.###.#.#.#.#.###.###.#####.#.###.#.#.#.###.#.#.#.#.###.###.###.#.#.###.#####.#######.#.###.#.#
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#.#...#.#...#.....#.#.#.#.#...#.#.>.>.#.....#.#.#...#...#.#...#.#...###...#.#...#...#.#...#...#.#.#...#...#...#.#.###.#.....#...#...#...#.#.#
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||||
#.#.#.#.#####.###.#v#.#.#.###.#.###v#.#####.#.#.#.#######.###.#.#.#####.###.#.#######.#.#######.#.#.###.###.###.#.###.#.#####.#.#.#####.#.#.#
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#...#...#...#.#...#.>.#.#.###.#.#...#.......#.#.#.#.>.>.#.#...#.#...#...#...#.#.....#.#.....#...#.#.###...#.#...#...#.#.#...#.#.#...#...#.#.#
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#########.#.#.#.###v###.#.###.#.#.###########.#.#.#.#v#.#.#.###.###.#.###.###.#.###.#.#####.#.###.#.#####.#.#.#####.#.#.#.#.#.#.###.#.###.#.#
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###.....#.#...#.#...###.#.#...#.#...###...###...#...#.#.#.#...#...#.#.#...###...#...#.#...#.#...#.#.>.>...#.#.#.....#.#.#.#.#.#.#...#.....#.#
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###.###.#.#####.#.#####.#.#.###.###.###.#.###########.#.#.###.###.#.#.#.#########.###.#.#.#.###.#.###v#####.#.#.#####.#.#.#.#.#.#.#########.#
|
||||
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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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|
||||
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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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|
||||
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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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|
||||
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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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||||
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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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|
||||
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|
||||
#...#...#.#.....#...#.#.#.#...#.>.>...#...###.....#...#.....#.#.###.#.#.#.#.#.#.#...>.>.#...###.#.#.......#...#...#.....#...#...#.#.#.#...###
|
||||
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|
||||
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|
||||
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|
||||
#.#.#...#...#...#.....#.......#.......#...#...#...###...#...#.#.#...#.#.#.#.#.#...#.........#.#...#####...#...#...#...#...###.......#...#...#
|
||||
#.#.#.#.#.#.###.#.###.#######.#######.#.#.#######.###.#.#v###.#.###.#.#.#.#.#.#.#############.#.#.###########.###.#.#################.#.#.###
|
||||
#.#...#...#.....#.#...#...#...#.......#.#.......#...#.#.>.>...#.#...#.#.#.#.#.#...###.......#.#.#.............#...#.#.................#...###
|
||||
#.###############.#.###.#.#.###.#######.#######.###.#.###v#####.#.###.#.#.#.#.###.###.#####.#.#.###############.###.#.#######################
|
||||
#...#.....#...###.#.....#...###...#...#...#.....#...#...#.#...#...###...#...#.#...#...#...#...#.............###.#...#.......................#
|
||||
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|
||||
###########################################################################################################################################.#
|
||||
23
day23/sample.txt
Normal file
23
day23/sample.txt
Normal file
@@ -0,0 +1,23 @@
|
||||
#.#####################
|
||||
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|
||||
#####################.#
|
||||
Reference in New Issue
Block a user