foo.cc: In function 'int main()':
foo.cc:14:16: warning: format '%lld' expects argument of type 'long long int', but argument 2 has type 'int' [-Wformat=]
   14 |     printf("%lld", i);
      |             ~~~^   ~
      |                |   |
      |                |   int
      |                long long int
      |             %d
foo.cc:22:16: warning: format '%lld' expects argument of type 'long long int', but argument 2 has type 'int' [-Wformat=]
   22 |     printf("%lld", i);
      |             ~~~^   ~
      |                |   |
      |                |   int
      |                long long int
      |             %d
foo.cc:30:16: warning: format '%lld' expects argument of type 'long long int', but argument 2 has type 'int' [-Wformat=]
   30 |     printf("%lld", i);
      |             ~~~^   ~
      |                |   |
      |                |   int
      |                long long int
      |             %d
foo.cc:10:7: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
   10 |  scanf("%lld %lld", &a, &b);
      |  ~~~~~^~~~~~~~~~~~~~~~~~~~~

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