foo.cc: In function 'int main()':
foo.cc:27:21: warning: unused variable 'k' [-Wunused-variable]
  int N, R, Q, i, j, k, s, p;
                     ^
foo.cc:27:24: warning: unused variable 's' [-Wunused-variable]
  int N, R, Q, i, j, k, s, p;
                        ^
foo.cc:27:27: warning: unused variable 'p' [-Wunused-variable]
  int N, R, Q, i, j, k, s, p;
                           ^

自豪地采用[jd5](https://github.com/masnn/jd5)进行评测