F. Playing With Array

#include <bits/stdc++.h>
using namespace std;
#define cin(v) for (auto &i : v) cin >> i;
#define cout(v) for (auto &i : v) cout << i << " "; cout<<'\n';
#define ll long long
#define ull unsigned long long
#define all(v) v.begin(), v.end()
#define rall(v) v.rbegin(), v.rend()
#define MOD 1000000007
#define endl '\n'
#define Time cerr << "Time Taken: " << (float)clock() / CLOCKS_PER_SEC << " Secs"<< "\n";

void Warding()
{
    ios_base::sync_with_stdio(false), cin.tie(nullptr), cout.tie(nullptr);
#ifndef ONLINE_JUDGE
    freopen("input.txt", "r", stdin), freopen("output.txt", "w", stdout);
#endif
}

/*
STOP USING int
*/


void solve(){
    ll n, k, x; cin>>n>>k;
    multiset<ll> mt;
    for(int i=0; i<n && cin>>x; i++){
        mt.insert(x);
        if(mt.size() == k) mt.erase(*prev(mt.end()));
    }
    if(!mt.size()) return void(cout<<-1<<endl);
    cout<<*prev(mt.end())<<endl;
}

int main()
{
    Warding();
    int TC = 1;
    cin >> TC;
    while (TC--)
    {
        solve();
    }
    Time
}