Duplicat

/// https://en.wikipedia.org/wiki/Cycle_detection
#include <iostream>
#include <bitset>
#include <vector>
using namespace std;
using Vi=vector <int>;
using bst=bitset <470001>;
int n,k,ans;

int main()
{
    cin>>n;
    Vi Arr;
    bst Occ;
    Arr.resize(n+1);
    for(int i=0;i<=n;++i)
    {
        cin>>Arr[i];
        if(Occ[Arr[i]])
            ans=Arr[i];
        Occ[Arr[i]]=true;
    }
    cin>>k;
    cout<<Arr[k-1]<<'\n'<<ans;
    return 0;
}