/in/foo.cc: In function 'int main()':
/in/foo.cc:71:12: warning: unused variable 'i' [-Wunused-variable]
  int N, M, i, j, T,K;
            ^
/in/foo.cc:71:15: warning: unused variable 'j' [-Wunused-variable]
  int N, M, i, j, T,K;
               ^
/in/foo.cc:71:18: warning: unused variable 'T' [-Wunused-variable]
  int N, M, i, j, T,K;
                  ^