foo.cc: In function 'int main()':
foo.cc:28:15: warning: format '%ld' expects argument of type 'long int', but argument 2 has type 'l' {aka 'long long int'} [-Wformat=]
   28 |     printf("%ld\n", i*i);
      |             ~~^     ~~~
      |               |      |
      |               |      l {aka long long int}
      |               long int
      |             %lld

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