#include <iostream>
using namespace std;

int main()
{
    int t;
    cin >> t;
    while (t--)
    {
        int n, m;
        cin >> n >> m;
        int a[200005];
        a[0] = m;
        for (int i = 1; i <= n; i++)
        {
            cin >> a[i];
        }
        int b[200005];
        b[0] = b[1] = 0;
        bool f = true;
        for (int i = 0; i < n; i++)
        {
            if (a[i + 1] - b[i + 1] > a[i])
            {
                f = false;
                break;
            }
            if (i < n - 1 && a[i] - a[i + 1] - b[i + 1] > a[i + 2])
            {
                f = false;
                break;
            }
            b[i + 2] = a[i] - (a[i + 1] - b[i + 1]);
        }
        if (b[n + 1])
        {
            f = false;
        }
        cout << (f ? "Yes" : "No") << endl;
    }
}