Triplets Min

#include <bits/stdc++.h>

using namespace std;

#define ll     long long
#define _test   int _TEST; cin>>_TEST; while(_TEST--)
#define pb     push_back

int main()
{
    _test
    {
        int n, q;
        cin>>n>>q;

        vector<int> a(n);
        for(auto &e: a)        cin>>e;

        sort(a.begin(), a.end());

        vector<ll int> cnt(n);

        for(int i=0; i<n; i++)
        {
            ll int x = n-i-1;
            cnt[i] = (x*(x-1))/2;
        }

        for(int i=1; i<n; i++)
            cnt[i] += cnt[i-1];

        while(q--)
        {
            ll int k;
            cin>>k;

            int pos = lower_bound(cnt.begin(), cnt.end(), k) - cnt.begin();

            cout<<a[pos]<<"\n";
        }
    }
}