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

#define rep(i, n) for (int i = 0; i < (int)n; i++)

int main() {
  int t;
  cin >> t;
  rep(i, t) {
    int n, m;
    cin >> n >> m;
    vector<int> v(n+2, 0);
    v[0] = 0; v[1] = m;
    bool ans = true;
    rep(j, n) {
      int a; cin >> a;
      int k = j + 2;
      if (v[k-2] <= a) {
	v[k-1] -= a - v[k-2];
	v[k] = a;
      } else {
	ans = false;
      }
    }
    if (ans)
      cout << "Yes" << endl;
    else
      cout << "No" << endl;
  }
  return 0;
}