/in/foo.cc: In function 'int main()':
/in/foo.cc:31:12: warning: unused variable 'T' [-Wunused-variable]
  int N, M, T, i, j, d;
            ^
/in/foo.cc:31:15: warning: unused variable 'i' [-Wunused-variable]
  int N, M, T, i, j, d;
               ^
/in/foo.cc:31:18: warning: unused variable 'j' [-Wunused-variable]
  int N, M, T, i, j, d;
                  ^
/in/foo.cc:31:21: warning: unused variable 'd' [-Wunused-variable]
  int N, M, T, i, j, d;
                     ^