/in/foo.cc: In function 'int main()':
/in/foo.cc:9:16: warning: unused variable 'j' [-Wunused-variable]
    9 |         int i, j, k, t, n, m,w;
      |                ^
/in/foo.cc:9:19: warning: unused variable 'k' [-Wunused-variable]
    9 |         int i, j, k, t, n, m,w;
      |                   ^