#include <stdio.h>
#include <stdlib.h>

#if 0
  #define PART part1
#else
  #define PART part2
#endif

#if 0
  #define FILENAME "sample.txt"
#else
  #define FILENAME "input.txt"
#endif

// outcome[opponent][player]
int outcome[3][3] = {
       /* player rock paper scissors*/
/* rock     */   { 1,   2,   0 },
/* paper    */   { 0,   1,   2 },
/* scissors */   { 2,   0,   1 },
};

// player[opponent][player]
int player[3][3] = {
              /* lose draw win */
/* rock     */   { 2,  0,  1 },
/* paper    */   { 0,  1,  2 },
/* scissors */   { 1,  2,  0 },
};

int score = 0;

void part1(char *line)
{
    int opponent = line[0] - 'A';
    int player   = line[2] - 'X';

    score += (player + 1) + (outcome[opponent][player] * 3);
}

void part2(char *line)
{
    int opponent = line[0] - 'A';
    int outcome  = line[2] - 'X';

    score += (player[opponent][outcome] + 1) + (outcome * 3);
}

void parse()
{
    FILE *fp = fopen(FILENAME, "r");
    if(!fp) {
        fprintf(stderr, "ERROR: Could not open file: %s\n", FILENAME);
        exit(1);
    }

    char line[8];
    while(fgets(line, sizeof(line), fp))
        PART(line);

    fclose(fp);
}

int main(void)
{
    parse();
    printf("%d\n", score);
    return 0;
}