/in/foo.cc: In function 'int main()':
/in/foo.cc:68:12: warning: unused variable 'i' [-Wunused-variable]
  int N, M, i, j, T, K;
            ^
/in/foo.cc:68:15: warning: unused variable 'j' [-Wunused-variable]
  int N, M, i, j, T, K;
               ^
/in/foo.cc:68:18: warning: unused variable 'T' [-Wunused-variable]
  int N, M, i, j, T, K;
                  ^