#include <iostream>
#define int long long
#define rep(i, n) for(i = 0; i < n; i++)
using namespace std;

int n, m;
int a[200001];
int b[200002];

bool solve() {
	int i;
	rep(i, n + 1) b[i] = 0;
	
	b[0] = m;
	rep(i, n) {
		int x = a[i + 1] - b[i + 1];
		if (x < 0 || x > b[i]) { return false; }
		b[i + 1] += x;
		b[i + 2] += b[i] - x;
	}
	
	for (i = 1; i <= n; i++) if (b[i] != a[i]) { return false; }
	return true;
}

signed main() {
	int t;
	cin >> t;
	while (t--) {
		cin >> n >> m;
		for (int i = 0; i < n; i++) cin >> a[i + 1];
		bool res = solve();
		if (res) cout << "Yes" << endl;
		else cout << "No" << endl;
	}
	return 0;
}