F1p66H - Online C++ Compiler & Debugging Tool

#include <bits/stdc++.h>
using namespace std;
int main()
{
    int n;
    cin>>n;
   vector<int> arr1(n,0);
   vector<int> arr2(n,0);
   for(int i=0;i<n;i++)
   {
       cin>>arr1[i];
       cin>>arr2[i];
   }
        int sum=0;
        sort(arr1.rbegin(),arr1.rend());
        sort(arr2.begin(),arr2.end());
        for(int i=0;i<n;i++)
        {
            sum=sum+ arr1[i]*arr2[i];
        }
        cout<<sum<<endl;


    return 0;
}