95 lines
2.0 KiB
C
95 lines
2.0 KiB
C
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#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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// parse_number takes a position of a last digit in a number
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// and returns a resulting number.
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int32_t parse_number(char *end);
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#define STR_E(tok) #tok
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#define STR(tok) STR_E(tok)
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#define SETS_STR_MAX_LEN 200
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#define CUBE_RED 0
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#define CUBE_GREEN 1
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#define CUBE_BLUE 2
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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_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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printf("Cannot open file %s\n", argv[1]);
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return -1;
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}
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int32_t power_sum = 0;
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while (getline(&line, &line_length, input) != -1) {
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char *colon_pos = strchr(line, ':');
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char *sets = colon_pos + 2;
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char *space_pos = NULL;
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int8_t cubes[3] = {0};
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while (NULL != (space_pos = strchr(sets, ' '))) {
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if (*(space_pos-1) == ',' || *(space_pos-1) == ';') {
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sets = space_pos + 1;
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continue;
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}
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int8_t n = parse_number(space_pos-1);
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switch (*(space_pos+1)) {
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case 'r':
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if (cubes[CUBE_RED] < n)
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cubes[CUBE_RED] = n;
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break;
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case 'g':
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if (cubes[CUBE_GREEN] < n)
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cubes[CUBE_GREEN] = n;
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break;
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case 'b':
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if (cubes[CUBE_BLUE] < n)
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cubes[CUBE_BLUE] = n;
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break;
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}
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sets = space_pos + 1;
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}
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power_sum += cubes[CUBE_RED] * cubes[CUBE_GREEN] * cubes[CUBE_BLUE];
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memset(line, 0, line_length);
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}
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printf("%d\n", power_sum);
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return 0;
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}
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int32_t parse_number(char *end) {
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int32_t num = 0;
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for (size_t n = 1;; n *= 10) {
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if (*end>>4 != 0x3)
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break;
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num += (*end&0xf) * n;
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--end;
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}
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return num;
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}
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