foo.cc: In function 'int main()':
foo.cc:7:15: warning: unused variable 'index' [-Wunused-variable]
  int a[10000],index[10000];
               ^~~~~
foo.cc:11:6: warning: unused variable 'min' [-Wunused-variable]
  int min=1,max=k;
      ^~~
foo.cc:11:12: warning: unused variable 'max' [-Wunused-variable]
  int min=1,max=k;
            ^~~

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