/in/foo.cc: In function 'int main()':
/in/foo.cc:165:31: warning: format '%d' expects argument of type 'int', but argument 2 has type 'long long int' [-Wformat=]
  165 |                 else printf("%d\n", maxflow);
      |                              ~^     ~~~~~~~
      |                               |     |
      |                               int   long long int
      |                              %lld