foo.cc: In function 'int main()':
foo.cc:9:25: warning: format '%d' expects argument of type 'int*', but argument 2 has type 'long long int*' [-Wformat=]
    9 |                 scanf("%d",&a);
      |                        ~^  ~~
      |                         |  |
      |                         |  long long int*
      |                         int*
      |                        %lld

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