#include <bits/stdc++.h>

using namespace std;
void fast_io() {
    ios_base::sync_with_stdio(false);
    cin.tie(nullptr);
}

void solve() {
    int n, m;
    cin >> n >> m;
    vector<int> a(n + 1);
    for (int i = 1; i <= n; i++) {
        cin >> a[i];
    }
    vector<int> dp(n + 1);
    dp[0] = m;
    for (int i = 0; i < n; i++) {
        int need = a[i + 1] - dp[i + 1];
        if (need > dp[i] || need < 0) {
            cout << "No\n";
            return;
        }
        dp[i + 1] += need;
        dp[i + 2] += dp[i] - need;
    }
    cout << "Yes\n";
}
int main() {
    fast_io();
    int t;
    cin >> t;
    for (; t--;) {
        solve();
    }
}