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

static inline void solution() {
  int n, m;
  cin >> n >> m;
  vector<int> A(n);
  for (int i = 0; i < n; i++) {
    cin >> A[i];
  }
  int a = 0, b = m;
  for (int i = 0; i < n; i++) {
    int rem = A[i] - a;
    if (rem < 0 || rem > b || (i == n - 1 && rem != b)) {
      cout << "No" << '\n';
      return;
    }
    b -= rem;
    a = b;
    b = A[i];
  }
  cout << "Yes" << '\n';
}

int main() {
  ios_base::sync_with_stdio(0), cin.tie(0);
  int TT;
  cin >> TT;
  while (TT--) {
    solution();
  }

  return 0;
}