Master Mind
char secret[5];
char guess[5];
int bb=0, ww=0;
字母正確、位置正確:black
bb = 0

letters:

int sctCount[6];   // ← secret[]

int gssCount[6];   // ← guess[]
字母正確、位置不正確:white
ww = 0

for(i...)
  ww += min(sctCount[i],gssCount[i]);

Game: