/in/foo.cc: In function 'int main()':
/in/foo.cc:21:24: warning: format '%d' expects argument of type 'int*', but argument 2 has type 'int' [-Wformat=]
  return !scanf("%d", -1);
                        ^
/in/foo.cc:32:37: warning: format '%d' expects argument of type 'int*', but argument 2 has type 'int' [-Wformat=]
  if (ans < k) return !scanf("%d", -1);
                                     ^
/in/foo.cc:62:38: warning: format '%d' expects argument of type 'int*', but argument 2 has type 'int' [-Wformat=]
   if (ans >= k) return !scanf("%d", g);
                                      ^