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

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