Day 4 Checkin

+ First day with a multiline input, added new infrastructure for that
+ Will need some refinement in the future
main
Joey Hines 2021-12-04 12:08:15 -07:00
parent bec55c46dd
commit 505d7d2033
No known key found for this signature in database
GPG Key ID: 80F567B5C968F91B
10 changed files with 890 additions and 9 deletions

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@ -3,5 +3,5 @@ project(aoc_2021 C)
set(CMAKE_C_STANDARD 99)
add_executable(aoc_2021 src/main.c src/day_1.c src/day.h src/day_2.c src/puzzle_input.c src/puzzle_input.h src/day_3.c)
add_executable(aoc_2021 src/main.c src/day_1.c src/day.h src/day_2.c src/puzzle_input.c src/puzzle_input.h src/day_3.c src/day_4.c)
target_link_libraries(aoc_2021 m)

601
inputs/day_4.txt 100644
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@ -0,0 +1,601 @@
99,56,7,15,81,26,75,40,87,59,62,24,58,34,78,86,44,65,18,94,20,17,98,29,57,92,14,32,46,79,85,84,35,68,55,22,41,61,90,11,69,96,23,47,43,80,72,50,97,33,53,25,28,51,49,64,12,63,21,48,27,19,67,88,66,45,3,71,16,70,76,13,60,77,73,1,8,10,52,38,36,74,83,2,37,6,31,91,89,54,42,30,5,82,9,95,93,4,0,39
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3 22 18 26 49
91 61 73 70 47

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@ -4,5 +4,6 @@
int day_1();
int day_2();
int day_3();
int day_4();
#endif //AOC_2021_DAY_H

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@ -48,7 +48,7 @@ int day_1() {
uint16_t data_len;
int64_t data[DATA_MAX_LEN];
parse_ret_t res = read_input(path, (void *)data, DATA_MAX_LEN, parse_long_from_buff, &data_len);
parse_ret_t res = read_input_single_line(path, (void *) data, DATA_MAX_LEN, parse_long_from_buff, &data_len);
if (res == PARSER_OK) {
part_1(data, data_len);

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@ -104,7 +104,9 @@ static void part_2(course_entry_t * course, uint16_t course_len) {
int day_2() {
course_entry_t course[MAX_COURSE_SIZE];
uint16_t data_len;
parse_ret_t res = read_input("../inputs/day_2.txt", (void *)course, MAX_COURSE_SIZE, parse_course_entry, &data_len);
parse_ret_t res = read_input_single_line("../inputs/day_2.txt", (void *) course, MAX_COURSE_SIZE,
parse_course_entry,
&data_len);
if (res == PARSER_OK) {
part_1(course, data_len);

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@ -121,7 +121,8 @@ int day_3() {
uint16_t len;
parse_ret_t parse_ret;
parse_ret = read_input("../inputs/day_3.txt", (void *)diagnostic_data_g, DIAGNOSTIC_LEN, parse_diagnostic_data, &len);
parse_ret = read_input_single_line("../inputs/day_3.txt", (void *) diagnostic_data_g, DIAGNOSTIC_LEN,
parse_diagnostic_data, &len);
if (parse_ret != PARSER_OK) {
printf("Unable to parse input data: %d", parse_ret);

189
src/day_4.c 100644
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@ -0,0 +1,189 @@
#include <stdio.h>
#include <stdint.h>
#include <string.h>
#include "puzzle_input.h"
#include "day.h"
#define BINGO_BOARD_SIZE 5
#define MAX_BINGO_BOARDS 101
#define MAX_DRAWS 100
typedef struct {
uint8_t board[BINGO_BOARD_SIZE][BINGO_BOARD_SIZE];
uint8_t matches[BINGO_BOARD_SIZE][BINGO_BOARD_SIZE];
uint8_t won;
} bingo_board_t;
typedef struct {
uint8_t num_boards;
uint8_t num_draws;
bingo_board_t boards[MAX_BINGO_BOARDS];
uint8_t draws[MAX_DRAWS];
} bingo_input_t;
parse_ret_t parse_bingo_input(char * buffer, void * data, uint16_t index) {
bingo_input_t * bingo_data = (bingo_input_t *)data;
char * tok;
parse_ret_t res;
if (index == 0) {
uint8_t draw_ndx = 0;
tok = strtok(buffer, ",");
while (tok != NULL) {
int64_t draw_val;
res = parse_long(tok, &draw_val, 10);
if (res != PARSER_OK) {
return res;
}
bingo_data->draws[draw_ndx] = (uint8_t)draw_val;
draw_ndx++;
tok = strtok(NULL, ",");
}
bingo_data->num_draws = draw_ndx+1;
}
else {
index--; // skip the draws line
tok = strtok(buffer, " ");
for (int row = 0; row < BINGO_BOARD_SIZE; row++) {
for (int col = 0; col < BINGO_BOARD_SIZE; col++) {
int64_t val;
res = parse_long(tok, &val, 10);
if (res != PARSER_OK) {
return res;
}
bingo_data->boards[index].board[row][col] = (uint8_t)val;
tok = strtok(NULL, " ");
}
}
bingo_data->num_boards++;
}
return PARSER_OK;
}
bingo_input_t bingo_input_g = {
.num_boards = 0,
.num_draws = 0,
.boards = {0},
};
uint32_t calc_score(bingo_board_t * board, uint8_t final_number) {
uint32_t sum = 0;
for (int row = 0; row < BINGO_BOARD_SIZE; row++) {
for (int col = 0; col < BINGO_BOARD_SIZE; col++) {
if (!board->matches[row][col]) {
sum += board->board[row][col];
}
}
}
return sum*final_number;
}
int day_4() {
uint16_t len;
uint8_t first_winner_found = 0;
int32_t winner_count = 0;
int32_t last_winner_ndx = -1;
int32_t last_winner_number = -1;
uint32_t score;
parse_ret_t res = read_input_multi_line("../inputs/day_4.txt", (void *)&bingo_input_g, MAX_BINGO_BOARDS+1, "", parse_bingo_input, &len);
if (res != PARSER_OK) {
printf("Failed to parse input: %d", res);
return -1;
}
for (int draw_ndx = 0; draw_ndx < bingo_input_g.num_draws; draw_ndx++) {
uint16_t draw = bingo_input_g.draws[draw_ndx];
for (int board_ndx = 0; board_ndx < bingo_input_g.num_boards; board_ndx++) {
uint8_t match_found = 0;
bingo_board_t *board = &bingo_input_g.boards[board_ndx];
for (int row = 0; row < BINGO_BOARD_SIZE; row++) {
for (int col = 0; col < BINGO_BOARD_SIZE; col++) {
if (board->board[row][col] == draw) {
board->matches[row][col] = 1;
match_found = 1;
}
if (match_found) {
break;
}
}
}
if (!board->won) {
uint8_t won_flag = 0;
for (int row = 0; row < BINGO_BOARD_SIZE; row++) {
if (board->matches[row][0] && board->matches[row][1] && board->matches[row][2] &&
board->matches[row][3] && board->matches[row][4]) {
if (!first_winner_found) {
first_winner_found = 1;
score = calc_score(board, draw);
}
winner_count++;
board->won = 1;
won_flag = 1;
break;
}
}
if (!won_flag) {
for (int col = 0; col < BINGO_BOARD_SIZE; col++) {
if (board->matches[0][col] && board->matches[1][col] && board->matches[2][col] &&
board->matches[3][col] && board->matches[4][col]) {
if (!first_winner_found) {
first_winner_found = 1;
score = calc_score(board, draw);
}
board->won = 1;
winner_count++;
break;
}
}
}
if (winner_count == bingo_input_g.num_boards) {
last_winner_ndx = board_ndx;
last_winner_number = draw;
break;
}
}
}
if (last_winner_ndx >= 0) {
break;
}
}
if (first_winner_found == 0) {
printf("Something went wrong, no winner was found\n");
return -2;
}
printf("PART 1: The final score was %d\n", score);
if (last_winner_ndx < 0) {
printf("Something went wrong, no last winner was found\n");
return -3;
}
uint32_t last_score = calc_score(&bingo_input_g.boards[last_winner_ndx], last_winner_number);
printf("PART 2: The final score of the last board was %d\n", last_score);
return 0;
}

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@ -25,6 +25,9 @@ int main(int argc, char * argv[]) {
case 3:
day_3();
break;
case 4:
day_4();
break;
default:
printf("Invalid day ding dong!\n");
return -2;

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@ -2,9 +2,16 @@
#include <stdlib.h>
#include <stdint.h>
#include <stdio.h>
#include <string.h>
#include "puzzle_input.h"
#define BUFFER_SIZE 256
parse_ret_t parse_long(char * buffer, int64_t *val, int16_t base) {
if (buffer == NULL) {
return PARSE_NULL;
}
*val = strtol(buffer, NULL, base);
if (*val == LONG_MIN || *val == LONG_MAX) {
@ -20,7 +27,7 @@ static parse_ret_t parse_long_base_from_buff(char * buffer, void * data, uint16_
uint64_t val;
int ret;
ret = parse_long(buffer, (int64_t *)&val, base);
ret = parse_long(buffer, (int64_t *)&val, (int16_t)base);
if (ret != PARSER_OK) {
return ret;
@ -39,8 +46,8 @@ parse_ret_t parse_long_base_2_from_buff(char * buffer, void * data, uint16_t ind
return parse_long_base_from_buff(buffer, data, index, 2);
}
parse_ret_t read_input(const char * file_path, void * data, uint16_t max_len, input_parser_t parser, uint16_t * len) {
char buffer[64];
parse_ret_t read_input_single_line(const char * file_path, void * data, uint16_t max_len, input_parser_t parser, uint16_t * len) {
char buffer[BUFFER_SIZE];
int c;
int ret = 0;
FILE * file = fopen(file_path, "r");
@ -92,4 +99,79 @@ parse_ret_t read_input(const char * file_path, void * data, uint16_t max_len, in
*len = data_ndx;
return ret;
}
}
char buffer_g[BUFFER_SIZE];
char line_buffer_g[BUFFER_SIZE];
parse_ret_t read_input_multi_line(const char * file_path, void * data, uint16_t max_len, char * line_sep, input_parser_t parser, uint16_t * len) {
int c;
int ret = 0;
FILE * file = fopen(file_path, "r");
uint16_t data_ndx = 0;
if (file != NULL) {
int buffer_ndx = 0;
int line_buffer_ndx = 0;
while ((c = fgetc(file)) != EOF) {
if (c == '\n') {
line_buffer_g[line_buffer_ndx] = 0;
if (strcmp(line_buffer_g, line_sep) == 0) {
ret = parser(buffer_g, data, data_ndx);
if (ret != PARSER_OK) {
break;
}
data_ndx++;
buffer_ndx = 0;
if (data_ndx >= max_len) {
ret = PARSER_RANGE_OVERFLOW;
break;
}
}
else {
strncpy(&buffer_g[buffer_ndx], line_buffer_g, line_buffer_ndx);
buffer_ndx += line_buffer_ndx;
buffer_g[buffer_ndx++] = ' ';
}
line_buffer_ndx = 0;
}
else {
line_buffer_g[line_buffer_ndx] = (char)c;
line_buffer_ndx++;
}
}
if (buffer_ndx > 0) {
strncpy(&buffer_g[buffer_ndx], line_buffer_g, line_buffer_ndx);
buffer_ndx += line_buffer_ndx;
buffer_g[buffer_ndx++] = ' ';
ret = parser(buffer_g, data, data_ndx);
if (ret != PARSER_OK) {
return ret;
}
data_ndx++;
if (data_ndx >= max_len) {
return PARSER_RANGE_OVERFLOW;
}
}
}
else {
ret = PARSE_FILE_ERR;
}
if (file != NULL) {
fclose(file);
}
*len = data_ndx;
return ret;
}

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@ -8,11 +8,13 @@ typedef enum {
PARSER_INVALID = -1,
PARSER_RANGE_OVERFLOW = -2,
PARSE_FILE_ERR = -3,
PARSE_NULL = -4,
} parse_ret_t;
typedef parse_ret_t (*input_parser_t)(char * buffer, void * data, uint16_t index);
parse_ret_t read_input(const char * file_path, void * data, uint16_t max_len, input_parser_t parser, uint16_t * len);
parse_ret_t read_input_single_line(const char * file_path, void * data, uint16_t max_len, input_parser_t parser, uint16_t * len);
parse_ret_t read_input_multi_line(const char * file_path, void * data, uint16_t max_len, char * sep, input_parser_t parser, uint16_t * len);
// Parsers
parse_ret_t parse_long_from_buff(char * buffer, void * data, uint16_t index);