/in/foo.cc: In function 'int main()':
/in/foo.cc:33:9: warning: unused variable 'M' [-Wunused-variable]
  int N, M, T, i, j, k;
         ^
/in/foo.cc:33:12: warning: unused variable 'T' [-Wunused-variable]
  int N, M, T, i, j, k;
            ^
/in/foo.cc:33:15: warning: unused variable 'i' [-Wunused-variable]
  int N, M, T, i, j, k;
               ^
/in/foo.cc:33:18: warning: unused variable 'j' [-Wunused-variable]
  int N, M, T, i, j, k;
                  ^
/in/foo.cc:33:21: warning: unused variable 'k' [-Wunused-variable]
  int N, M, T, i, j, k;
                     ^