/in/foo.cc: In function 'int main()':
/in/foo.cc:52:21: warning: unused variable 'n3' [-Wunused-variable]
   52 |         int n1, n2, n3;
      |                     ^~
/in/foo.cc:54:13: warning: unused variable 'a3' [-Wunused-variable]
   54 |         int a3[100000]={0};
      |             ^~