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

int main(){
    int T;
    cin >> T;
    while(T--){
        ll n, m;
        cin >> n >> m;
        vector<ll> a(n);
        for(auto &&v:a)cin >> v;
        reverse(a.begin(), a.end());
        a.push_back(m);
        auto b = a;
        bool ans = true;
        for(int i = 0; i + 1 <= n; i++){
            int pre1 = b[i + 1];
            int pre2 = a[i] - pre1;
            //a[i + 1] -= pre2;
            if(pre2){
                if(i + 1 == n){
                    ans = false;
                    break;
                }
                b[i + 2] -= pre2;
                if(b[i + 2] < 0)ans = false;
            }
            /*reverse(a.begin(), a.end());
            for(int i = 0; i <= n; i++){
                cerr << a[i] << " ";
            }
            cerr << '\n';
            reverse(a.begin(), a.end());*/
        }
        /*reverse(a.begin(), a.end());
        for(int i = 0; i <= n; i++){
            cerr << a[i] << " ";
            if(a[i] < 0)ans = false;
        }
        cerr << '\n';*/
        cout << (ans ? "Yes" : "No") << endl;
    }
}