/in/foo.cc: In function 'int main()':
/in/foo.cc:14:16: warning: format '%lld' expects argument of type 'long long int', but argument 2 has type 'int' [-Wformat=]
   14 |     printf("%lld",sum);
      |             ~~~^  ~~~
      |                |  |
      |                |  int
      |                long long int
      |             %d