commit b2215616c2ba2f386f48f8714beeaa034072cd6a
parent 7ef5ddd38b62e5e0f587e8632281994345b43ff1
Author: bsandro <brian.drosan@gmail.com>
Date: Mon, 13 Dec 2021 23:33:38 +0200
Day 13, puzzle 1
Diffstat:
5 files changed, 1253 insertions(+), 0 deletions(-)
diff --git a/day13/Makefile b/day13/Makefile
@@ -0,0 +1,25 @@
+NAME=$(shell basename ${PWD})
+SRC=$(wildcard *.c ../common/*.c)
+DEPS:=$(wildcard *.h ../common/*.h)
+OBJ:=$(SRC:.c=.o)
+CFLAGS=-O2 -std=c99 -Werror -Wall -Wextra -I. -I../common
+LDFLAGS=-lc
+
+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/day13/input.txt b/day13/input.txt
@@ -0,0 +1,987 @@
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+
+fold along x=655
+fold along y=447
+fold along x=327
+fold along y=223
+fold along x=163
+fold along y=111
+fold along x=81
+fold along y=55
+fold along x=40
+fold along y=27
+fold along y=13
+fold along y=6
diff --git a/day13/main.c b/day13/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 13\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/day13/puzzle.c b/day13/puzzle.c
@@ -0,0 +1,191 @@
+#define _DEFAULT_SOURCE
+
+#include <stdio.h>
+#include <stdlib.h>
+#include <errno.h>
+#include <string.h>
+#include <strings.h>
+#include <assert.h>
+#include <ctype.h>
+#include <limits.h>
+#include <stdbool.h>
+
+#include "util.h"
+
+#define STR_LEN 128
+
+struct point_t {
+ int x;
+ int y;
+};
+
+struct fold_t {
+ int x;
+ int y;
+};
+
+void parse_point(struct array_t *points, const char *str);
+void parse_fold(struct array_t *folds, const char *str);
+void print_points(struct array_t *points);
+struct point_t flip_point(const struct point_t point, const struct point_t fold);
+void add_point(struct array_t *points, struct point_t point);
+void draw_points(const struct array_t *points);
+
+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;
+
+ *result1 = 0;
+ *result2 = 0;
+
+ struct array_t points = { .data = NULL };
+ array_init(&points, sizeof(struct point_t), 10);
+ struct array_t folds = { .data = NULL };
+ array_init(&folds, sizeof(struct fold_t), 10);
+
+ bool folds_started = false;
+ while (fgets(buf, STR_LEN, infile) != NULL) {
+ if (strlen(buf) == 1) {
+ folds_started = true;
+ continue;
+ }
+
+ if (folds_started) {
+ parse_fold(&folds, buf);
+ } else {
+ parse_point(&points, buf);
+ }
+
+ ++line_num;
+ bzero(buf, STR_LEN);
+ }
+
+ for (size_t f = 0; f < folds.count; ++f) {
+ struct array_t points_folded = { .data = NULL };
+ array_init(&points_folded, sizeof(struct point_t), 10);
+
+ struct point_t fold = ((struct point_t *)folds.data)[f];
+ //printf("fold x: %d, y: %d\n", fold.x, fold.y);
+
+ for (size_t i = 0; i < points.count; ++i) {
+ const struct point_t *data = points.data;
+ add_point(&points_folded, flip_point(data[i], fold));
+ }
+
+ //printf("points: %zu\n", points_folded.count);
+ if (f == 0) {
+ *result1 = points_folded.count;
+ }
+
+ // copy folded points over old ones
+ free(points.data);
+ points.data = points_folded.data;
+ points.cap = points_folded.cap;
+ points.count = points_folded.count;
+ }
+
+ // mutiny! ignoring feof/ferror.
+ fclose(infile);
+}
+
+struct point_t flip_point(const struct point_t point, const struct point_t fold) {
+ struct point_t p1 = point;
+ if (fold.x > 0 && point.x > fold.x) {
+ p1.x = 2 * fold.x - point.x;
+ } else if (fold.y > 0 && point.y > fold.y) {
+ p1.y = 2 * fold.y - point.y;
+ }
+ //printf("%2d,%2d -> %2d,%2d\n", point.x, point.y, p1.x, p1.y);
+ return p1;
+}
+
+void add_point(struct array_t *points, struct point_t point) {
+ assert(points != NULL);
+ struct point_t *data = points->data;
+ for (size_t i = 0; i < points->count; ++i) {
+ if (data[i].x == point.x && data[i].y == point.y) {
+ return;
+ }
+ }
+
+ if (points->count >= points->cap) {
+ array_expand(points);
+ }
+ data = points->data;
+ data[points->count++] = point;
+}
+
+void parse_point(struct array_t *points, const char *str) {
+ assert(points != NULL);
+ assert(str != NULL);
+ char *tmp = strndup(str, STR_LEN);
+ assert(tmp != NULL);
+ char *token = NULL;
+
+ int numbers[2] = {0};
+ int i = 0;
+ while ((token = strsep(&tmp, ",\n")) != NULL) {
+ if (*token != '\0') {
+ assert(i < 2);
+ numbers[i] = atoi(token);
+ ++i;
+ }
+ }
+
+ if (points->count >= points->cap) {
+ array_expand(points);
+ }
+
+ struct point_t *data = points->data;
+ data[points->count++] = (struct point_t){ .x=numbers[0], .y=numbers[1] };
+}
+
+void parse_fold(struct array_t *folds, const char *str) {
+ assert(folds != NULL);
+ assert(str != NULL);
+ char *tmp = strndup(str, STR_LEN);
+ assert(tmp != NULL);
+ char *token = NULL;
+
+ int i = 0;
+ int is_x = -1; // 0 is y, 1 is x
+ struct point_t fold = {0};
+ while ((token = strsep(&tmp, "=\n")) != NULL) {
+ if (*token != '\0') {
+ assert(i < 2);
+ if (is_x == -1) {
+ size_t len = strlen(token);
+ // we're just taking last character and checking if it is 'x'
+ is_x = token[len-1] == 'x';
+ } else if (is_x == 0) {
+ fold.y = atoi(token);
+ } else if (is_x == 1) {
+ fold.x = atoi(token);
+ } else {
+ assert(0 == 1);
+ }
+ ++i;
+ }
+ }
+
+ if (folds->count >= folds->cap) {
+ array_expand(folds);
+ }
+
+ struct point_t *data = folds->data;
+ data[folds->count++] = fold;
+}
+
+void print_points(struct array_t *points) {
+ assert(points != NULL);
+ struct point_t *data = points->data;
+ for (size_t i = 0; i < points->count; ++i) {
+ printf("x: %2d, y: %2d\n", data[i].x, data[i].y);
+ }
+}
diff --git a/day13/test.txt b/day13/test.txt
@@ -0,0 +1,21 @@
+6,10
+0,14
+9,10
+0,3
+10,4
+4,11
+6,0
+6,12
+4,1
+0,13
+10,12
+3,4
+3,0
+8,4
+1,10
+2,14
+8,10
+9,0
+
+fold along y=7
+fold along x=5
