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

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