foo.cc: In function ‘int main()’:
foo.cc:7:13: warning: format ‘%d’ expects argument of type ‘int*’, but argument 2 has type ‘long long int*’ [-Wformat=]
    7 |     scanf("%d", &n);
      |            ~^   ~~
      |             |   |
      |             |   long long int*
      |             int*
      |            %lld
foo.cc:15:14: warning: format ‘%d’ expects argument of type ‘int’, but argument 2 has type ‘long long int’ [-Wformat=]
   15 |     printf("%d",a+b);
      |             ~^  ~~~
      |              |   |
      |              int long long int
      |             %lld