/in/foo.cc: In function 'int main()':
/in/foo.cc:53:9: warning: unused variable 'm' [-Wunused-variable]
   53 |  int n, m, i, j, k, t;
      |         ^
/in/foo.cc:53:15: warning: unused variable 'j' [-Wunused-variable]
   53 |  int n, m, i, j, k, t;
      |               ^
/in/foo.cc:53:18: warning: unused variable 'k' [-Wunused-variable]
   53 |  int n, m, i, j, k, t;
      |                  ^
/in/foo.cc:53:21: warning: unused variable 't' [-Wunused-variable]
   53 |  int n, m, i, j, k, t;
      |                     ^