commit 417f3aae6145ef80efcf0092fd199ea3749455f9
parent bdc50082a5c948ca6ce5e9835ea638a303d9b2bd
Author: bsandro <brian.drosan@gmail.com>
Date: Thu, 16 Dec 2021 01:05:29 +0200
Day 15, puzzle 1
Diffstat:
5 files changed, 360 insertions(+), 0 deletions(-)
diff --git a/day15/Makefile b/day15/Makefile
@@ -0,0 +1,25 @@
+NAME=$(shell basename ${PWD})
+SRC=$(wildcard *.c ../common/*.c)
+DEPS:=$(wildcard *.h ../common/*.h)
+OBJ:=$(SRC:.c=.o)
+CFLAGS=-O0 -g -std=c99 -Werror -Wall -Wextra -I. -I../common
+LDFLAGS=-lc -lm
+
+all: $(NAME)
+
+.PHONY: clean run
+
+clean:
+ rm -f $(OBJ) $(NAME)
+
+%.o : %.c $(DEPS)
+ @$(CC) $(CFLAGS) -c $< -o $@
+
+$(NAME): $(OBJ)
+ @$(CC) $(OBJ) -o $@ $(LDFLAGS)
+
+run: $(NAME)
+ @./$(NAME) input.txt
+
+test: $(NAME)
+ @./$(NAME) test.txt
diff --git a/day15/input.txt b/day15/input.txt
@@ -0,0 +1,100 @@
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diff --git a/day15/main.c b/day15/main.c
@@ -0,0 +1,29 @@
+#include <stdio.h>
+#include <time.h>
+#include <string.h>
+
+void puzzle(const char *filename, long long *res1, long long *res2);
+
+int main(int argc, char *argv[]) {
+ printf("Advent of Code: day 15\n");
+ double time_start = clock();
+
+ if (argc <= 1) {
+ printf("Usage: %s inputfile.txt\n", argv[0]);
+ return -1;
+ }
+
+ const char *filename = argv[1];
+ long long counter1 = -1;
+ long long counter2 = -1;
+
+ puzzle(filename, &counter1, &counter2);
+
+ printf("Puzzle #1: %lld\n", counter1);
+ printf("Puzzle #2: %lld\n", counter2);
+
+ double elapsed = clock() - time_start;
+ printf("Elapsed: %f\n", elapsed / CLOCKS_PER_SEC);
+
+ return 0;
+}
diff --git a/day15/puzzle.c b/day15/puzzle.c
@@ -0,0 +1,196 @@
+#define _DEFAULT_SOURCE
+
+#include <stdio.h>
+#include <stdlib.h>
+#include <errno.h>
+#include <string.h>
+#include <strings.h>
+#include <stdbool.h>
+#include <assert.h>
+#include <time.h>
+#include <inttypes.h>
+#include <ctype.h>
+#include <math.h>
+#include <unistd.h>
+
+#include "util.h"
+
+#define STR_LEN 1024
+#define MAP_WIDTH 500
+#define MAP_HEIGHT 500
+
+struct tile_t {
+ int x, y;
+ int g, h, f;
+ int p_x, p_y;
+};
+
+int astar(int8_t map[MAP_HEIGHT][MAP_WIDTH], struct tile_t start, struct tile_t end);
+void array_push(struct array_t *array, struct tile_t tile);
+struct tile_t * array_get(struct array_t *array, int x, int y);
+bool array_has(struct array_t *array, int x, int y);
+void array_delete(struct array_t *array, struct tile_t tile);
+void array_print(struct array_t *array);
+
+void puzzle(const char *filename, long long *result1, long long *result2) {
+ FILE *infile = fopen(filename, "r");
+ if (infile == NULL) {
+ fprintf(stderr, "fopen() error: %s\n", strerror(errno));
+ return;
+ }
+
+ char buf[STR_LEN] = {0};
+ unsigned int line_num = 0;
+ int8_t map[MAP_HEIGHT][MAP_WIDTH] = {0};
+ int line_width = 0;
+
+ while (fgets(buf, STR_LEN, infile) != NULL) {
+ assert(line_num < MAP_HEIGHT);
+ size_t len = strlen(buf);
+ line_width = len - 1;
+ assert(len > 0 && line_width < MAP_WIDTH);
+ for (int i = 0; i < line_width; ++i) {
+ if (isdigit((int)buf[i])) {
+ map[line_num][i] = buf[i] - '0';
+ }
+ }
+
+ ++line_num;
+ bzero(buf, STR_LEN);
+ }
+
+ struct tile_t start = {0};
+ struct tile_t end = {
+ .x = line_width - 1,
+ .y = line_num - 1
+ };
+
+ *result1 = astar(map, start, end);
+ *result2 = 0;
+
+ // mutiny! ignoring feof/ferror.
+ fclose(infile);
+}
+
+int astar(int8_t map[MAP_HEIGHT][MAP_WIDTH], struct tile_t start, struct tile_t end) {
+ struct array_t visited = { .data = NULL };
+ array_init(&visited, sizeof(struct tile_t), 10);
+ struct array_t upcoming = { .data = NULL };
+ array_init(&upcoming, sizeof(struct tile_t), 10);
+
+ array_push(&upcoming, start);
+
+ static const int dirs[4][2] = {{-1, 0}, {0, -1}, {1, 0}, {0, 1}};
+
+ while (upcoming.count > 0) {
+ // choosing upcoming node with the lowest f
+ struct tile_t *upcoming_data = upcoming.data;
+ struct tile_t current = upcoming_data[0];
+ for (size_t i = 0; i < upcoming.count; ++i) {
+ if (upcoming_data[i].f < current.f) {
+ current = upcoming_data[i];
+ }
+ }
+
+ //printf("current: %d,%d (%d)\n", current.x, current.y, current.f);
+ if (current.x == end.x && current.y == end.y) {
+ //printf("end!\n");
+ free(upcoming.data);
+ free(visited.data);
+ return current.f;
+ }
+
+
+ //printf("upcoming(begin):\n");
+ //array_print(&upcoming);
+
+ array_push(&visited, current);
+ array_delete(&upcoming, current);
+
+ //printf("visited:\n");
+ //array_print(&visited);
+ //printf("upcoming(after delete):\n");
+ //array_print(&upcoming);
+
+ // iterating through adjacent nodes
+ for (int i = 0; i < 4; ++i) {
+ int x1 = current.x + dirs[i][0];
+ int y1 = current.y + dirs[i][1];
+ struct tile_t child = {.x=x1, .y=y1, .p_x = current.x, .p_y = current.y};
+ // end point is always bottom right
+ if (x1 > end.x || x1 < 0 || y1 > end.y || y1 < 0) {
+ continue;
+ }
+ if (array_has(&visited, child.x, child.y)) {
+ continue;
+ }
+ child.g = current.g + map[y1][x1];
+ child.h = (end.y - y1) + (end.x - x1);
+ child.f = child.g + child.h;
+ //printf("(%d,%d g:%d h:%d f:%d)", child.x, child.y, child.g, child.h, child.f);
+
+ struct tile_t *s = array_get(&upcoming, child.x, child.y);
+ if (s == NULL) {
+ //printf("pushing child %d,%d to upcoming\n", child.x, child.y);
+ array_push(&upcoming, child);
+ } else {
+ if (s->g <= child.g) {
+ continue;
+ }
+ }
+ }
+ //printf("\n");
+ //printf("upcoming(end %zu):\n", upcoming.count);
+ //array_print(&upcoming);
+ //printf("\n");
+ //sleep(1);
+ }
+
+ return 0;
+}
+
+void array_print(struct array_t *array) {
+ struct tile_t *data = array->data;
+ for (size_t i = 0; i < array->count; ++i) {
+ printf("[%zu] %d,%d (f:%d,g:%d)\n", i, data[i].x, data[i].y, data[i].f, data[i].g);
+ }
+}
+
+void array_push(struct array_t *array, struct tile_t tile) {
+ if (array->count >= array->cap) {
+ array_expand(array);
+ }
+ struct tile_t *data = array->data;
+ data[array->count++] = tile;
+}
+
+struct tile_t * array_get(struct array_t *array, int x, int y) {
+ struct tile_t *data = array->data;
+ for (size_t i = 0; i < array->count; ++i) {
+ if (data[i].x == x && data[i].y == y) {
+ return &data[i];
+ }
+ }
+ return NULL;
+}
+
+bool array_has(struct array_t *array, int x, int y) {
+ return array_get(array, x, y) != NULL;
+}
+
+void array_delete(struct array_t *array, struct tile_t tile) {
+ assert(array != NULL);
+ if (!array_has(array, tile.x, tile.y)) return;
+
+ struct tile_t *data_new = calloc(array->cap, array->elem_size);
+ struct tile_t *data = array->data;
+ size_t count_new = 0;
+ for (size_t i = 0; i < array->count; ++i) {
+ if (data[i].x != tile.x || data[i].y != tile.y) {
+ data_new[count_new++] = data[i];
+ }
+ }
+ free(array->data);
+ array->data = data_new;
+ array->count = count_new;
+}
diff --git a/day15/test.txt b/day15/test.txt
@@ -0,0 +1,10 @@
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