commit aecd7a94862d9b346bfef2e0e247c4b0ec43cd9f
parent 6eaa7994d753e265e3c67e9890db44f5ddbf0ee8
Author: bsandro <brian.drosan@gmail.com>
Date: Sat, 4 Dec 2021 21:40:32 +0200
Day 04, puzzle 1
Diffstat:
5 files changed, 913 insertions(+), 0 deletions(-)
diff --git a/day04/Makefile b/day04/Makefile
@@ -0,0 +1,26 @@
+NAME=$(shell basename ${PWD})
+CC=cc
+SRC=$(wildcard *.c)
+DEPS:=$(wildcard *.h)
+OBJ:=$(SRC:.c=.o)
+
+CFLAGS=-O0 -std=c99 -g -Werror -Wall -Wextra -I.
+
+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/day04/input.txt b/day04/input.txt
@@ -0,0 +1,601 @@
+72,86,73,66,37,76,19,40,77,42,48,62,46,3,95,17,97,41,10,14,83,90,12,23,81,98,11,57,13,69,28,63,5,78,79,58,54,67,60,34,39,84,94,29,20,0,24,38,43,51,64,18,27,52,47,74,59,22,85,65,80,2,99,70,33,91,53,93,9,82,8,50,7,56,30,36,89,71,21,49,31,88,26,96,16,1,75,87,6,61,4,68,32,25,55,44,15,45,92,35
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diff --git a/day04/main.c b/day04/main.c
@@ -0,0 +1,25 @@
+#include <stdio.h>
+
+int puzzle1(const char *filename);
+//int puzzle2(const char *filename);
+
+int main(int argc, char *argv[]) {
+ printf("Advent of Code: day 04\n");
+
+ if (argc <= 0) {
+ return -1;
+ }
+ if (argc <= 1) {
+ printf("Usage: %s inputfile.txt\n", argv[0]);
+ return -1;
+ }
+
+ const char *filename = argv[1];
+
+ int counter1 = puzzle1(filename);
+ printf("Puzzle #1: %d\n", counter1);
+ //int counter2 = puzzle2(filename);
+ //printf("Puzzle #2: %d\n", counter2);
+
+ return 0;
+}
diff --git a/day04/puzzle1.c b/day04/puzzle1.c
@@ -0,0 +1,242 @@
+#include <stdio.h>
+#include <stdlib.h>
+#include <errno.h>
+#include <string.h>
+#include <strings.h>
+#include <stdbool.h>
+#include <assert.h>
+
+#define PRINT_ERR(func) fprintf(stderr, #func "() error: %s\n", strerror(errno));
+
+#define ARRAY_PUSH
+
+#define FMT_(l) #l
+#define FMT(l) FMT_(l)
+
+#define STR_LEN 16384
+#define FMT_STRING "%" FMT(STR_LEN) "s"
+
+#define BOARD_SIZE 5
+
+struct board_t {
+ int tiles[BOARD_SIZE][BOARD_SIZE]; // 0-99 base, -1 marks drawn tiles
+ int rows_sig[BOARD_SIZE]; // sum of numbers that works as a "signature"
+ int cols_sig[BOARD_SIZE]; // once it goes down to -5 it means r/k are done
+ int sum;
+};
+
+struct array_t {
+ void *data;
+ size_t elem_size;
+ size_t count;
+ size_t cap;
+};
+
+bool array_init(struct array_t *array, size_t elem_size, size_t cap);
+bool array_expand(struct array_t *array);
+
+#define PRINT_ARRAY(array, type) do { \
+ printf("array count %zu, cap %zu, elem size %zu, data %p\n", \
+ array.count, array.cap, array.elem_size, &array); \
+ for (size_t i = 0; i < array.count; ++i) { \
+ type *data = (type *)array.data; \
+ printf("%d ", data[i]); \
+ } \
+ printf("\n"); \
+} while (0);
+
+bool make_numbers_array(struct array_t *numbers, const char *str);
+bool fill_board(struct board_t *board, int row, const char *str);
+
+void print_boards(const struct array_t *boards);
+
+/* ****************************************************************** */
+
+int puzzle1(const char *filename) {
+ FILE *infile = fopen(filename, "r");
+ if (infile == NULL) {
+ fprintf(stderr, "fopen() error: %s\n", strerror(errno));
+ return -1;
+ }
+
+ char buf[STR_LEN] = {0};
+ unsigned int line_num = 0;
+ int result = -1;
+
+ struct array_t numbers = { .data = NULL };
+ struct array_t boards = { .data = NULL };
+
+ if (!array_init(&numbers, sizeof(int), 100)) {
+ fprintf(stderr, "array_init() failed\n");
+ goto finish; // @todo assert?
+ }
+
+ if (!array_init(&boards, sizeof(struct board_t), 10)) {
+ fprintf(stderr, "array_init() failed");
+ goto finish; // @todo assert?
+ }
+
+ struct board_t *current_board = NULL;
+ int current_row = -1;
+
+ while (fgets(buf, STR_LEN, infile) != NULL) {
+ // first line is always random numbers sequence
+ if (line_num == 0) {
+ if (!make_numbers_array(&numbers, buf)) {
+ fprintf(stderr, "make_numbers_array() failed\n");
+ goto finish;
+ }
+
+ } else if (strlen(buf) == 1) { // line sized 1 is a separator before boards
+ if (boards.count >= boards.cap && !array_expand(&boards)) {
+ fprintf(stderr, "array_expand() failed\n");
+ goto finish;
+ }
+
+ struct board_t *data = (struct board_t *)boards.data;
+ current_board = &data[boards.count++];
+ current_row = 0;
+
+ } else { // filling the board
+ assert(current_board != NULL);
+ assert(current_row != -1);
+ if (!fill_board(current_board, current_row++, buf)) {
+ fprintf(stderr, "fill_board() failed\n");
+ goto finish;
+ }
+ }
+
+ ++line_num;
+ bzero(buf, STR_LEN);
+ }
+
+ //print_boards(&boards);
+
+ // rolling
+ for (size_t i = 0; i < numbers.count; ++i) {
+ int num = ((int *)numbers.data)[i];
+
+ for (size_t j = 0; j < boards.count; ++j) {
+ struct board_t *board = &((struct board_t *)boards.data)[j];
+
+ for (int r = 0; r < BOARD_SIZE; ++r) {
+ for (int k = 0; k < BOARD_SIZE; ++k) {
+ if (board->tiles[r][k] == num) {
+ board->tiles[r][k] = -1;
+ board->rows_sig[r] -= num + 1;
+ board->cols_sig[k] -= num + 1;
+ board->sum -= num;
+
+ if (board->rows_sig[r] == -BOARD_SIZE || board->cols_sig[k] == -BOARD_SIZE) {
+ result = board->sum * num;
+ goto out;
+ }
+ }
+ }
+ }
+ }
+ }
+
+out:
+ //print_boards(&boards);
+
+ // mutiny! ignoring feof/ferror.
+finish:
+ free(numbers.data);
+ free(boards.data);
+ fclose(infile);
+ return result;
+}
+
+/* ************************* BOILERPLATE ************************* */
+
+void print_boards(const struct array_t *boards) {
+ for (size_t i = 0; i < boards->count; ++i) {
+ const struct board_t *brd = (const struct board_t *)boards->data;
+ brd += i;
+ printf("\n----------- board %2zu ------------\n", i);
+ for (int r = 0; r < BOARD_SIZE; ++r) {
+ for (int k = 0; k < BOARD_SIZE; ++k) {
+ printf("[%3d]", brd->tiles[r][k]);
+ }
+ printf(" = [%3d]\n", brd->rows_sig[r]);
+ }
+ printf("=================================\n");
+ for (int k = 0; k < BOARD_SIZE; ++k) {
+ printf("[%3d]", brd->cols_sig[k]);
+ }
+ printf("\n");
+ }
+}
+
+bool make_numbers_array(struct array_t *numbers, const char *str) {
+ char *tmp = strndup(str, STR_LEN);
+ char *token = NULL;
+
+ assert(tmp != NULL);
+
+ while ((token = strsep(&tmp, ",")) != NULL) {
+ int num = atoi(token);
+
+ if (numbers->count >= numbers->cap && !array_expand(numbers)) {
+ fprintf(stderr, "array_expand() failed\n");
+ return false;
+ }
+
+ int *data = (int *)numbers->data;
+ data[numbers->count++] = num;
+ }
+
+ free(tmp);
+ return true;
+}
+
+bool fill_board(struct board_t *board, int row, const char *str) {
+ char *tmp = strndup(str, STR_LEN);
+ assert(tmp != NULL);
+ char *token = NULL;
+ int col = 0;
+ while ((token = strsep(&tmp, " ")) != NULL) {
+ if (*token != '\0') { // WOWZA
+ int num = atoi(token);
+ board->tiles[row][col] = num;
+ board->rows_sig[row] += num;
+ board->cols_sig[col] += num;
+ board->sum += num;
+ ++col;
+ }
+ }
+ assert(col == BOARD_SIZE);
+ return true;
+}
+
+// @todo move generic service stuff to some kind of shared header?
+
+bool array_init(struct array_t *array, size_t elem_size, size_t cap) {
+ if (array->data != NULL)
+ return false;
+
+ array->cap = cap;
+ array->elem_size = elem_size;
+ array->data = calloc(cap, elem_size);
+
+ if (array->data == NULL) {
+ PRINT_ERR(calloc)
+ return false;
+ }
+
+ return true;
+}
+
+bool array_expand(struct array_t *array) {
+ size_t new_cap = array->cap * 2;
+ array->data = realloc(array->data, array->elem_size * new_cap);
+
+ if (array->data == NULL) {
+ PRINT_ERR(realloc)
+ return false;
+ }
+
+ array->cap = new_cap;
+ return true;
+}
diff --git a/day04/test.txt b/day04/test.txt
@@ -0,0 +1,19 @@
+7,4,9,5,11,17,23,2,0,14,21,24,10,16,13,6,15,25,12,22,18,20,8,19,3,26,1
+
+22 13 17 11 0
+ 8 2 23 4 24
+21 9 14 16 7
+ 6 10 3 18 5
+ 1 12 20 15 19
+
+ 3 15 0 2 22
+ 9 18 13 17 5
+19 8 7 25 23
+20 11 10 24 4
+14 21 16 12 6
+
+14 21 17 24 4
+10 16 15 9 19
+18 8 23 26 20
+22 11 13 6 5
+ 2 0 12 3 7
