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+#.###.#.#.#.###.###.#.#.###.#.#.#.#.###.#.#.#.#.#.###.###########.#.#.#.#.###.###.#.#.#####.#####.#.#############.#.#.#######.#.###.#.###.#.# +#.....#...#.....###...#.....#...#...###...#...#...###.............#...#...###.....#...#####.......#...............#...#######...###...###...# +############################################################################################################################################# diff --git a/day-20/main.c b/day-20/main.c new file mode 100644 index 0000000..ab2954d --- /dev/null +++ b/day-20/main.c @@ -0,0 +1,223 @@ +#include "aoc.h" +#include + +static const i32 DX[4] = {0, 1, 0, -1}; +static const i32 DY[4] = {-1, 0, 1, 0}; + +typedef struct { + i32 start_x, start_y; + i32 end_x, end_y; +} Cheat; + +typedef struct { + i32 *dist; + i32 width, height; +} DistanceMap; + +typedef struct { + i32 x, y; +} Vec2i; + +static Vec2i +vec2i(i32 x, i32 y) { + Vec2i result = { .x = x, .y = y }; + return result; +} + +typedef struct { + Vec2i *points; + i32 write, read; + isize size; +} Queue; + +static inline i32 +queue_next(Queue *queue, i32 index) { + return (index + 1) % queue->size; +} + +static inline void +queue_push(Queue *queue, Vec2i pos) { + ASSERT(queue_next(queue, queue->write) != queue->read); + queue->points[queue->write] = pos; + queue->write = queue_next(queue, queue->write); +} + +static inline Vec2i +queue_pop(Queue *queue) { + ASSERT(queue->read != queue->write); + Vec2i result = queue->points[queue->read]; + queue->read = queue_next(queue, queue->read); + return result; +} + +static inline bool +queue_empty(Queue *queue) { + return queue->write == queue->read; +} + +static DistanceMap +compute_distances(Arena *arena, Grid grid, i32 x, i32 y) { + DistanceMap map = { + .width = grid.width, + .height = grid.height, + .dist = ARENA_ALLOC_ARRAY(arena, i32, grid.width * grid.height) + }; + for (i32 i = 0; i < grid.width * grid.height; i++) { + map.dist[i] = INT32_MAX; + } + map.dist[y * map.width + x] = 0; + Queue queue = {.size = 1024, .points = ARENA_ALLOC_ARRAY(arena, Vec2i, 1024) }; + queue_push(&queue, vec2i(x, y)); + while (!queue_empty(&queue)) { + Vec2i point = queue_pop(&queue); + i32 dist = map.dist[point.y * map.width + point.x]; + for (i32 i = 0; i < 4; i++) { + i32 nx = point.x + DX[i]; + i32 ny = point.y + DY[i]; + if (nx >= 0 && ny >= 0 && nx < map.width && ny < map.height) { + u8 cell = grid.grid[ny * map.width + nx]; + if (cell != '#') { + if (dist + 1 < map.dist[ny * map.width + nx]) { + map.dist[ny * map.width + nx] = dist + 1; + queue_push(&queue, vec2i(nx, ny)); + } + } + } + } + } + return map; +} + +static void +dump_distance_map(DistanceMap map) { + for (i32 y = 0; y < map.height; y++) { + for (i32 x = 0; x < map.width; x++) { + i32 dist = map.dist[y * map.width + x]; + if (dist == INT32_MAX) { + printf("#"); + } else { + printf("%d", dist % 10); + } + } + printf("\n"); + } +} + +typedef DYNAMIC_ARRAY(Cheat) Cheats; + +static Cheats +enumerate_cheats(Arena *arena, Grid *grid, i32 length) { + Cheats cheats = {0}; + i32 radius = length; // manhattan distance between start and end + for (i32 y = 0; y < grid->height; y++) { + for (i32 x = 0; x < grid->width; x++) { + /* printf("@ (%d, %d)\n", x, y); */ + for (i32 dy = -radius; dy <= radius; dy++) { + // abs(dx) + abs(dy) <= radius + for (i32 dx = -radius; dx <= radius; dx++) { + i32 d = abs(dx) + abs(dy); + if (d == 0 || d > radius) { + continue; + } + + i32 x_ = x + dx; + i32 y_ = y + dy; + + if (x_ < 0 || y_ < 0 || x_ >= grid->width || y_ >= grid->height) { + continue; + } + + i32 source_index = y * grid->width + x; + i32 target_index = y_ * grid->width + x_; + if (grid->grid[source_index] != '#' && grid->grid[target_index] != '#') { + *push(&cheats, arena) = (Cheat) { .start_x = x, .start_y = y, .end_x = x_, .end_y = y_ }; + /* i32 len = abs(dx) + abs(dy); */ + /* printf("Found cheat of length %d between (%d, %d) and (%d, %d)\n", len - 1, x, y, x_, y_); */ + } + } + } + } + } + return cheats; +} + +static i32 +count_savings(Arena *arena, Grid grid, i32 start_x, i32 start_y, i32 end_x, i32 end_y, DistanceMap dm_start, DistanceMap dm_end, i32 cheat_duration) { + Cheats cheats = enumerate_cheats(arena, &grid, cheat_duration); + /* printf("Found %ld possible cheats\n", cheats.len); */ + + i32 without_cheats = dm_end.dist[start_y * grid.width + start_x]; + /* printf("without cheats: %d\n", without_cheats); */ + + i32 count = 0; + for (isize i = 0; i < cheats.len; i++) { + Cheat cheat = cheats.data[i]; + ASSERT(grid.grid[cheat.start_y * grid.width + cheat.start_x] != '#'); + ASSERT(grid.grid[cheat.end_y * grid.width + cheat.end_x] != '#'); + i32 dx = cheat.end_x - cheat.start_x; + i32 dy = cheat.end_y - cheat.start_y; + i32 cheat_len = abs(dx) + abs(dy); + ASSERT(cheat_len <= cheat_duration); + ASSERT(cheat_len > 0); + + i32 start_index = cheat.start_y * grid.width + cheat.start_x; + i32 end_index = cheat.end_y * grid.width + cheat.end_x; + + i32 saved = without_cheats - (dm_start.dist[start_index] + cheat_len + dm_end.dist[end_index]); + bool bar = false; + if (saved > 0) { +#if 0 + printf("From (%d, %d) [%d] via cheat (%d, %d) -> (%d, %d) [%d] to (%d, %d) [%d]\n", + start_x, start_y, dm_start.dist[start_index], + cheat.start_x, cheat.start_y, cheat.end_x, cheat.end_y, cheat_len, + end_x, end_y, dm_end.dist[end_index]); +#endif +#if 0 + printf("Saved %d\n", saved); +#endif + } + if (saved >= 100) count++; + } + return count; +} + +int main(int argc, char **argv) { + Arena *arena = make_arena(Megabytes(256)); + str input = read_file(arena, argv[1]); + Grid grid = parse_grid(input, arena); + + i32 start_x = -1, start_y = -1; + i32 end_x = -1, end_y = -1; + + for (i32 y = 0; y < grid.height; y++) { + for (i32 x = 0; x < grid.width; x++) { + if (grid_at(&grid, x, y) == 'S') { + start_x = x; + start_y = y; + } + else if (grid_at(&grid, x, y) == 'E') { + end_x = x; + end_y = y; + } + } + } + ASSERT(start_x != -1 && start_y != -1); + ASSERT(end_x != -1 && end_y != -1); + + grid.grid[start_y * grid.width + start_x] = '.'; + + DistanceMap dm_start = compute_distances(arena, grid, start_x, start_y); + /* dump_distance_map(dm_start); */ + DistanceMap dm_end = compute_distances(arena, grid, end_x, end_y); + /* dump_distance_map(dm_end); */ + ASSERT(dm_start.dist[1 * grid.width + 3] + dm_end.dist[1 * grid.width + 3] == + dm_end.dist[start_y * grid.width + start_x]); + + Arena watermark = *arena; + i32 part_1 = count_savings(arena, grid, start_x, start_y, end_x, end_y, dm_start, dm_end, 2); + printf("%d\n", part_1); + + *arena = watermark; + i32 part_2 = count_savings(arena, grid, start_x, start_y, end_x, end_y, dm_start, dm_end, 20); + printf("%d\n", part_2); +} diff --git a/day-20/test.txt b/day-20/test.txt new file mode 100644 index 0000000..c097dae --- /dev/null +++ b/day-20/test.txt @@ -0,0 +1,15 @@ +############### +#...#...#.....# +#.#.#.#.#.###.# +#S#...#.#.#...# +#######.#.#.### +#######.#.#...# +#######.#.###.# +###..E#...#...# +###.#######.### +#...###...#...# +#.#####.#.###.# +#.#...#.#.#...# +#.#.#.#.#.#.### +#...#...#...### +###############