82 lines
1.7 KiB
C
82 lines
1.7 KiB
C
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#include <stdio.h>
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int main(int argc, char *argv[]) {
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if (argc != 2) {
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printf("Usage: %s <input filename>", argv[0]);
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return 1;
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}
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FILE *fp = fopen(argv[1], "r");
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if (fp == NULL) {
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printf("Could not open file %s", argv[1]);
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return 1;
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}
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// Each line looks like this:
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// A X
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// One byte Action, one space, one byte Reaction
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int score_1 = 0;
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int score_2 = 0;
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char line[5];
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while (fgets(line, sizeof(line), fp)) {
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char action = line[0] - 'A'; // Map A-C to 0-2
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char reaction = line[2] - 'X'; // Map X-Z to 0-2
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// Points for reaction
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score_1 += reaction + 1;
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// Points for win/draw/lose
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int points[] = {3,6,0}; // tie, win, lsoe
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score_1 += points[(reaction - action + 3) % 3];
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// Part 2
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char winstate = reaction;
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score_2 += winstate*3;
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score_2 += (action + (winstate+2)) % 3 + 1;
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}
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fclose(fp);
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printf("Part 1 Score: %d\n", score_1);
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printf("Part 2 Score: %d\n", score_2);
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return 0;
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}
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/* int simplifiedSolution(char action, char reaction) { */
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/* int score_1 = 0; */
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/* int score_2 = 0; */
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/* score_1 += reaction + 1; */
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/* if ((reaction - action + 3) % 3 == 1) { */
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/* // Win */
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/* score_1 += 6; */
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/* } else if (action == reaction) { */
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/* // Draw */
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/* score_1 += 3; */
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/* } else { */
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/* // Lose */
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/* } */
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/* if (winstate == 0) { */
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/* // Need to lose */
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/* score_2 += 0; */
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/* score_2 += (action+2) % 3; */
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/* } else if (winstate == 1) { */
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/* // Need to draw */
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/* score_2 += 3; */
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/* score_2 += action; */
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/* } else { */
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/* // Need to win */
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/* score_2 += 6; */
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/* score_2 += ((action+1) % 3); */
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/* } */
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/* score_2 += 1; // Because of zero indexing */
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/* } */
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