Solution of 'Less or Equal' (Codeforces)

 Hey guys! Here's my solution of question-'Less or Equal' from Codeforces. I am looking forward to your suggestions for my code or blog. So do comment. TY and Happy coding!

question link: https://codeforces.com/contest/977/problem/C

#include <bits/stdc++.h>

#define pair <int,int> pp

using namespace std;

int main()

{

    int n,k;

    cin>>n>>k;

    vector<int> vec;

    for(int i=0;i<n;i++){

        int x;

        cin>>x;

        vec.push_back(x);

    }

    sort(vec.begin(),vec.end());

    if((k!=0)&&(vec[k-1]!=vec[k])) {cout<<vec[k-1];}

    else if((k==0)&&vec[k]!=1){cout<<vec[k]-1;}

    else{

        cout<<-1;

    }

}