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#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>
enum RPS {
ROCK,
PAPR,
SCRS,
};
enum RPS
rps_beats(enum RPS rps)
{
switch (rps) {
case ROCK: return SCRS;
case PAPR: return ROCK;
case SCRS: return PAPR;
}
return -1;
}
enum RPS
rps_loses(enum RPS rps)
{
switch (rps) {
case ROCK: return PAPR;
case PAPR: return SCRS;
case SCRS: return ROCK;
}
return -1;
}
int
rps_pickscore(enum RPS rps)
{
switch (rps) {
case ROCK: return 1;
case PAPR: return 2;
case SCRS: return 3;
}
return 0;
}
int
rps_gamescore_b(enum RPS a, enum RPS b)
{
if (b == a)
return 3;
if (rps_beats(b) == a)
return 6;
return 0;
}
int
main(int argc, char ** argv)
{
int part = 1, i;
char buf[BUFSIZ];
int score = 0;
while ((i = getopt(argc, argv, "p:")) != -1) {
switch (i) {
case 'p':
part = atoi(optarg);
break;
default:
return -1;
}
}
while (fgets(buf, sizeof(buf), stdin)) {
enum RPS a, b;
if (strlen(buf) != 4)
break;
switch (buf[0]) {
case 'A': a = ROCK; break;
case 'B': a = PAPR; break;
case 'C': a = SCRS; break;
default:
fprintf(stderr, "Unexpected input: %c (0x%2d)\n", buf[0], buf[0]);
return -1;
}
switch (part) {
case 1:
switch (buf[2]) {
case 'X': b = ROCK; break;
case 'Y': b = PAPR; break;
case 'Z': b = SCRS; break;
default:
fprintf(stderr, "Unexpected input: %c (0x%2d)\n", buf[2], buf[2]);
return -1;
}
break;
case 2:
switch (buf[2]) {
case 'X': b = rps_beats(a); break;
case 'Y': b = a; break;
case 'Z': b = rps_loses(a); break;
default:
fprintf(stderr, "Unexpected input: %c (0x%2d)\n", buf[2], buf[2]);
return -1;
}
break;
default:
fprintf(stderr, "Unexpected puzzle part %d\n", part);
return -1;
}
score += rps_pickscore(b) + rps_gamescore_b(a, b);
}
printf("Score: %d\n", score);
return 0;
}
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