foo.cc: In function 'int Cin2(int*, int*, int)':
foo.cc:21:14: error: invalid types 'int*[<unresolved overloaded function type>]' for array subscript
  cout<<b[find]<<" "<<a[find]<<endl;
              ^
foo.cc:21:28: error: invalid types 'int*[<unresolved overloaded function type>]' for array subscript
  cout<<b[find]<<" "<<a[find]<<endl;
                            ^
foo.cc: In function 'int Px(int*, int*, int)':
foo.cc:37:1: warning: no return statement in function returning non-void [-Wreturn-type]
 }
 ^

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