#define _CRT_SECURE_NO_WARNINGS
#include<iostream>
#include<algorithm>
#include<cctype>
#include<cstdio>
#include<cstring>
#include<string>
#include<vector>
#include<set>
#include<cmath>
#include<queue>

using namespace std;

int main()
{
    long long data[100005];
    int n, m;
    int t;
    cin >> t;
    while (t--)
    {
        cin >> n >> m;
        n--;
        m--;
        long long cnt = 0;
        for (int i = 0; i < n; i++)
        {
            scanf("%I64d", &data[i]);
            data[i]++;
            cnt += data[i];
        }
        cnt++;
        sort(data, data + n);
        for (int i = n - 1; i >= 0 && n - i <= m; i--)
        {
            cnt -= data[i];
            cnt += 1;
        }

        cout << cnt << "\n";
    }
}