diff options
| -rw-r--r-- | 2018/day17.c | 87 |
1 files changed, 87 insertions, 0 deletions
diff --git a/2018/day17.c b/2018/day17.c new file mode 100644 index 0000000..d2fd02c --- /dev/null +++ b/2018/day17.c @@ -0,0 +1,87 @@ +#include <stdbool.h> +#include <stdio.h> +#include <stdlib.h> +#include <string.h> + +typedef unsigned uint; + +static char map[2048][2048]; + +static void draw(void) { + for (uint y = 0; y < 14; ++y) { + for (uint x = 494; x < 508; ++x) { + printf("%c", map[y][x]); + } + printf("\n"); + } + printf("\n"); +} + +int main(void) { + memset(map, '.', sizeof(map)); + uint minY = 2048, maxY = 0; + while (!feof(stdin)) { + char a, b; + uint fixed, start, end; + scanf("%c=%u, %c=%u..%u\n", &a, &fixed, &b, &start, &end); + for (uint i = start; i <= end; ++i) { + if (a == 'y') { + map[fixed][i] = '#'; + } else { + map[i][fixed] = '#'; + } + } + if (a == 'y') { + if (fixed < minY) minY = fixed; + if (fixed > maxY) maxY = fixed; + } else { + if (start < minY) minY = start; + if (end > maxY) maxY = end; + } + } + map[0][500] = '|'; + + bool hot; + do { + hot = false; + for (uint y = 0; y < 2047; ++y) { + for (uint x = 0; x < 2048; ++x) { + char *self = &map[y][x]; + char *below = &map[y + 1][x]; + char *left = &map[y][x - 1]; + char *right = &map[y][x + 1]; + if (*self != '|' && *self != '*') continue; + if (*below == '.') { + *below = '|'; + hot = true; + } + if (*below != '#' && *below != '~') continue; + if (*left == '.') { + *left = '|'; + hot = true; + } + if (*right == '.') { + *right = '|'; + hot = true; + } + if (*self == '|' && (*left == '#' || *left == '*')) { + *self = '*'; + hot = true; + } + if (*self == '*' && (*right == '#' || *right == '~')) { + *self = '~'; + hot = true; + } + } + } + } while (hot); + draw(); + + uint count = 0; + for (uint y = minY; y <= maxY; ++y) { + for (uint x = 0; x < 2048; ++x) { + if (map[y][x] != '.' && map[y][x] != '#') count++; + } + } + printf("%u\n", count); +} |