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

int main()
{
	int T;
	cin >> T;
	for( int i = 0; i < T; i++ ) {
		int N, M;
		cin >> N >> M;
		vector<int> A( N ), a( N + 1 );
		for( int j = 0; j < N; j++ ) cin >> A[j];
		a[0] = M;
		string ans = "Yes";
		for( int j = 0; j < N; j++ ) {
			int l, h;
			if( j == 0 ) {
				l = 0;
				h = M;
				if( A[j] < l || h < A[j] ) {
					ans = "No";
					break;
				}
				a[j + 1] = A[j];
				a[j] -= A[j];
			}
			else if( j ) {
				l = a[j - 1];
				h = a[j - 1] + a[j];
				if( A[j] < l || h < A[j] ) {
					ans = "No";
					break;
				}
				a[j + 1] = A[j];
				a[j] = h - A[j];
			}
		}
		cout << ans << endl;
	}
}