foo.cc: In function 'int main()':
foo.cc:15:14: warning: format '%d' expects argument of type 'int', but argument 2 has type 'long long int' [-Wformat=]
   15 |     printf("%d\n",ans);
      |             ~^    ~~~
      |              |    |
      |              int  long long int
      |             %lld

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