#include <bits/stdc++.h>
using namespace std;

void solve() {
	int n;
	cin >> n;
	vector<int> a(n);
	for (int i = 0; i < n; i++) cin >> a[i];
	for (int i = 0; i < n - 1; i++) {
		if (a[i] <= a[i + 1]) {
			a[i + 1] -= a[i];
		} else {
			cout << "NO" << endl;
			return;
		}
	}
	cout << "YES" << endl;
}

int main() {
	int t;
	cin >> t;
	while (t--) solve();
}