foo.cc: In function 'int main()':
foo.cc:16:6: warning: unused variable 'e' [-Wunused-variable]
  int e=qvchong(a,n);
      ^
foo.cc:17:6: warning: unused variable 'd' [-Wunused-variable]
  int d=qvchong(b,m);
      ^
foo.cc: In function 'int qvchong(int*, int)':
foo.cc:34:1: warning: control reaches end of non-void function [-Wreturn-type]
 }
 ^

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