foo.cc: In function 'int main()':
foo.cc:11:17: warning: format '%d' expects argument of type 'int*', but argument 2 has type 'long int*' [-Wformat=]
   11 |         scanf("%d", &arr[i]);
      |                ~^   ~~~~~~~
      |                 |   |
      |                 |   long int*
      |                 int*
      |                %ld

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