foo.cc: In function ‘int main()’:
foo.cc:7:18: warning: format ‘%d’ expects argument of type ‘int’, but argument 2 has type ‘long long int’ [-Wformat=]
    7 |         printf("%d",y);
      |                 ~^  ~
      |                  |  |
      |                  |  long long int
      |                  int
      |                 %lld