foo.cc: In function 'int main()':
foo.cc:14:38: error: cannot convert 'int (*)[1001]' to 'int (*)[1000]' in initialization
  int(*dp)[1000] = new int[M + 1][1001];
                                      ^

自豪的采用HydroJudge(https://github.com/hydro-dev/Hydro)进行评测。