29 lines
618 B
C++
29 lines
618 B
C++
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#include<bits/stdc++.h>
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using namespace std;
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using ll = int64_t;
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void solve() {
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int n, c; cin >> n >> c;
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vector<ll> a(n);
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for (int i = 0; i < n; ++i) cin >> a[i];
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vector<int> idx(n - 1);
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iota(idx.begin(), idx.end(), 1);
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sort(idx.begin(), idx.end(), [&](int i, int j) {
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if (a[i] == a[j]) return i < j;
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return a[i] > a[j];
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});
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ll sum = a[0];
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for (auto&& i : idx) {
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sum += a[i];
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if (sum < (i + 1) * c) {
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cout << "No\n";
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return;
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}
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}
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cout << "Yes\n";
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}
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int main() {
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int t; cin >> t;
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while (t--) solve();
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}
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