89 lines
2.1 KiB
C
89 lines
2.1 KiB
C
#include <stdio.h>
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#include <stdlib.h>
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#include "aoc.h"
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typedef struct {
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char you, opponent;
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} Round;
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typedef struct {
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Round *rounds;
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size_t count;
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} day2_Data;
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static void *day2_parse(char **lines, int line_count) {
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day2_Data *data = calloc(1, sizeof(day2_Data));
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data->count = line_count;
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data->rounds = calloc(line_count, sizeof(Round));
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for (int i = 0; i < line_count; i++) {
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data->rounds[i].opponent = lines[i][0];
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data->rounds[i].you = lines[i][2];
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}
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return data;
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}
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static int day2_part1(void *p) {
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day2_Data *data = (day2_Data*)p;
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int result = 0;
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for (int i = 0; i < data->count; i++) {
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Round *round = &data->rounds[i];
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char you = round->you;
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char opponent = round->opponent;
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if (you == 'X') {
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result += 1;
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} else if (you == 'Y') {
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result += 2;
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} else if (you == 'Z') {
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result += 3;
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}
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if ((you == 'X' && opponent == 'A') ||
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(you == 'Y' && opponent == 'B') ||
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(you == 'Z' && opponent == 'C')) {
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result += 3;
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} else if ((you == 'X' && opponent == 'C') ||
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(you == 'Y' && opponent == 'A') ||
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(you == 'Z' && opponent == 'B')) {
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result += 6;
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}
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}
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return result;
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}
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static int day2_part2(void *p) {
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day2_Data *data = (day2_Data*)p;
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int result = 0;
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for (int i = 0; i < data->count; i++) {
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Round *round = &data->rounds[i];
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char you = round->you;
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char opponent = round->opponent;
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if (you == 'X') { // lose
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if (opponent == 'A') result += 3; // opponent = rock , me = scissors
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if (opponent == 'B') result += 1; // opponent = paper , me = rock
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if (opponent == 'C') result += 2; // opponent = scissors, me = paper
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} else if (you == 'Y') { // draw
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if (opponent == 'A') result += 1;
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if (opponent == 'B') result += 2;
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if (opponent == 'C') result += 3;
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} else if (you == 'Z') { // win
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if (opponent == 'A') result += 2; // opponent = rock , me = paper
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if (opponent == 'B') result += 3; // opponent = paper , me = scissors
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if (opponent == 'C') result += 1; // opponent = scissors, me = rock
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}
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if (you == 'Y') {
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result += 3;
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} else if (you == 'Z') {
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result += 6;
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}
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}
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return result;
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}
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ADD_SOLUTION(2, day2_parse, day2_part1, day2_part2);
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