AoC2022/02_02.c

#include <stdio.h>

#define ROCK 1
#define PAPER 2
#define SCISSORS 3

int norm_symb(char s) {
	int r = (int) s - 0x40;

	if (r > 3 ) {
		r -= 0x17;
	}
	return r;
}

int score(int p1, int p2) {
	if (p1 == p2) {
		return 3;
	}

	switch (p2) {
	case ROCK: 
		if (p1 == SCISSORS) return 6;
		break;
	case PAPER:
		if (p1 == ROCK) return 6;
		break;
	case SCISSORS :
		if (p1 == PAPER) return 6;
		break;
	}
	return 0;
}

int symb (int p1, int outcome) {
	if (outcome == 2) return p1;
	if (outcome == 1) { // need to lose
		switch (p1) {
		case ROCK:
			return SCISSORS;
			break;
		case PAPER:
			return ROCK;
			break;
		case SCISSORS:
			return PAPER;
			break;
		}
		
	}
	switch (p1) { // need to win
	case ROCK:
		return PAPER;
		break;
	case PAPER:
		return SCISSORS;
		break;
	case SCISSORS:
		return ROCK;
		break;
	}		
}

int main () {
	char cur[20];
	int p1;
	int p2;
	int sc = 0;
	while (fgets(cur,20,stdin) != NULL) {
		p1 = norm_symb(cur[0]);
		p2 = symb(p1,norm_symb(cur[2]));
		printf("%d %d %d\n", p1,p2, score(p1,p2));
		sc += (score(p1,p2) + p2);
	}
	printf("%d\n", sc);
}