/in/foo.cc: In function 'int main()':
/in/foo.cc:38:25: warning: statement has no effect [-Wunused-value]
     key[list[d[hd]][i]] == 1;
     ~~~~~~~~~~~~~~~~~~~~^~~~
/in/foo.cc:44:17: warning: suggest parentheses around assignment used as truth value [-Wparentheses]
  if(key[n+1] = 1) printf("Yes\n");
                 ^