81 lines
2.6 KiB
C
81 lines
2.6 KiB
C
#define _GNU_SOURCE
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#include <stdio.h>
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#include <stdlib.h>
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#include <string.h>
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#include <stdint.h>
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#include <stdbool.h>
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#define ISDIGIT(c) (c >= 0x30 && c <= 0x39)
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int main(int argc, char **argv) {
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FILE *input;
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char *line = NULL;
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size_t line_buf_length = 0;
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if (argc == 1 || argv[1][0] == '-')
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input = stdin;
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else if ((input = fopen(argv[1], "r")) == NULL) {
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fprintf(stderr, "Cannot open file %s\n", argv[1]);
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return -1;
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}
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char **engine = NULL;
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ssize_t engine_line_size = 0;
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ssize_t engine_lines = 0;
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while (getline(&line, &line_buf_length, input) != -1) {
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ssize_t len = strlen(line) - 1;
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if (engine == NULL) {
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engine = (char **) calloc(len, sizeof(char*));
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engine_line_size = len;
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}
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engine[engine_lines] = (char*) calloc(len, sizeof(char));
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memcpy(engine[engine_lines], line, len);
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++engine_lines;
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memset(line, 0, line_buf_length);
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}
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int32_t part_number = 0;
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int32_t n = 0;
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int32_t multiplier = 1;
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bool adjacent = false;
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for (ssize_t i = engine_lines-1; i >= 0; --i)
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for (ssize_t j = engine_line_size-1; j >= 0; --j) {
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if (ISDIGIT(engine[i][j])) {
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n += (engine[i][j]&0xf) * multiplier;
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multiplier *= 10;
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if (adjacent == false && ((j+1 <= engine_line_size-1 && !ISDIGIT(engine[i][j+1]) && engine[i][j+1] != '.') ||
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(j-1 >=0 && !ISDIGIT(engine[i][j-1]) && engine[i][j-1] != '.') ||
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(i+1 <= engine_lines-1 && !ISDIGIT(engine[i+1][j]) && engine[i+1][j] != '.') ||
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(i-1 >= 0 && !ISDIGIT(engine[i-1][j]) && engine[i-1][j] != '.') ||
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((i+1 <= engine_lines-1 && j+1 <= engine_line_size-1) && !ISDIGIT(engine[i+1][j+1]) && engine[i+1][j+1] != '.') ||
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((i+1 <= engine_lines-1 && j-1 >= 0) && !ISDIGIT(engine[i+1][j-1]) && engine[i+1][j-1] != '.') ||
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((i-1 >= 0 && j+1 <= engine_line_size-1) && !ISDIGIT(engine[i-1][j+1]) && engine[i-1][j+1] != '.') ||
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((i-1 >= 0 && j-1 >= 0) && !ISDIGIT(engine[i-1][j-1]) && engine[i-1][j-1] != '.'))) {
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adjacent = true;
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}
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}
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if ((!ISDIGIT(engine[i][j]) || j == 0) && n != 0) {
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if (adjacent)
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part_number += n;
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n = 0;
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multiplier = 1;
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adjacent = false;
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}
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}
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for (ssize_t i = 0; i < engine_lines; ++i)
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free(engine[i]);
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free(engine);
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printf("%d\n", part_number);
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return 0;
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} |