/in/foo.cc: In function 'int main()':
/in/foo.cc:50:11: warning: unused variable 'i' [-Wunused-variable]
  ll N, M, i, j, T;
           ^
/in/foo.cc:50:14: warning: unused variable 'j' [-Wunused-variable]
  ll N, M, i, j, T;
              ^
/in/foo.cc:50:17: warning: unused variable 'T' [-Wunused-variable]
  ll N, M, i, j, T;
                 ^