C

#include <bits/stdc++.h>
using namespace std;
#define int long long
signed main(int argc, char const *argv[])
{
    ios::sync_with_stdio(0);
    cin.tie(0);
    cout.tie(0);
    int t;
    cin >> t;
    while (t--)
    {
        int n, c;
        cin >> n >> c;
        int total = 0;
        vector<int> a(n);
        for (auto &elem : a)
        {
            cin >> elem;
            total += elem;
        }
        vector<int> v;
        v.push_back(0);
        for (int i = 1; i < n; i++)
            v.push_back(a[i]);
        sort(v.begin(), v.end());
        v.push_back(0);
        vector<int> pre(n + 1, 0);
        vector<int> suf(n + 1, 0);

        for (int i = 1; i <= n - 1; i++)
        {
            pre[i] += pre[i - 1] + v[i];
        }
        for (int i = n - 1; i >= 1; i--)
        {
            suf[i] += suf[i + 1] + v[i];
        }
        int sum = a[0];
        int ans = 1;
        for (int i = 0; i <= n - 1; i++)
        {
            int cost = min((sum + pre[i]) * (total - sum - pre[i]), (sum + suf[n - i]) * (total - sum - suf[n - i]));
            if (cost <= c)
            {
                ans = i + 1;
                break;
            }
        }
        cout << ans << "\n";
    }
    return 0;
}