foo.cc: In function 'int main()':
foo.cc:15:16: warning: format '%lld' expects argument of type 'long long int', but argument 2 has type 'int' [-Wformat=]
   15 |     printf("%lld\n", ans);
      |             ~~~^     ~~~
      |                |     |
      |                |     int
      |                long long int
      |             %d
foo.cc:16:13: error: expected '}' at end of input
   16 |     return 0;
      |             ^
foo.cc:6:12: note: to match this '{'
    6 | int main() {
      |            ^

[Hydro](https://hydro.ac)提供评测服务