wordle.c

enum answer {
  GREY,
  YELLOW,
  GREEN
};
typedef enum answer ans;
int choose_ct(int c, int a, int b)
{
  return ((c * a) + ((1 - c) * b));
}
int ccontains(char *word, char *guess, int n, char c)
{
  if (n > 0){
    int b = ccontains(word+1,guess+1,n-1,c);
    int d = choose_ct((word[0] == guess[0]), 0, (c == word[0]));
    int c = choose_ct(d,1,b);
    return c;
  }else{
    return 0;
  }
}
void do_guess(char *word, char *guess, ans *out, int n)
{
  int i=0;
  while (i < n)
  {
    char g = guess[i];
    int eq = (g == word[i]);
    int ot = choose_ct(eq,GREEN,choose_ct(ccontains(word,guess,n,g),YELLOW,GREY));
    out[i] = ot;
    i++;
  }
}