73 lines
1.7 KiB
C
73 lines
1.7 KiB
C
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#include <stdio.h>
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#include <stdbool.h>
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#include <string.h>
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#include <stdlib.h>
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#include "../lib/util.h"
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char password_buffer[30] = {0};
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bool is_valid_password_part_2(const char *password_line) {
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int char_first, char_second;
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char target_char;
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sscanf(password_line, "%d-%d %c: %s", &char_first, &char_second, &target_char, password_buffer);
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bool result = ((password_buffer[char_first - 1] == target_char) != (password_buffer[char_second - 1] == target_char));
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// printf("%s: %s\n", password_line, result ? "valid" : "invalid");
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return result;
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}
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bool is_valid_password_part_1(const char *password_line) {
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int char_min, char_max;
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char target_char;
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char *password = password_buffer;
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sscanf(password_line, "%d-%d %c: %s", &char_min, &char_max, &target_char, password_buffer);
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while(*password > 0) {
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if (*password == target_char) {
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char_min--;
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char_max--;
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}
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password++;
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}
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bool result = char_min <= 0 && char_max >= 0;
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// printf("%s: %s\n", password_line, result ? "valid" : "invalid");
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return result;
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}
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int count_passwords(bool (*validation_function)(const char *password)) {
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char *data_buffer = load_input();
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char *data = data_buffer;
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int valid_passwords = 0;
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int invalid_passwords = 0;
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char *line = strtok(data, "\n");
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do {
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if (validation_function(line)) {
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valid_passwords++;
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} else {
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invalid_passwords++;
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}
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} while (line = strtok(NULL, "\n"));
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free(data_buffer);
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return valid_passwords;
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}
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int part_1() {
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return count_passwords(is_valid_password_part_1);
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}
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int part_2() {
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return count_passwords(is_valid_password_part_2);
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}
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int main() {
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printf("Part 1: %d\n", part_1());
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printf("Part 2: %d\n", part_2());
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return 0;
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}
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