#include <stdio.h>
#include <atcoder/all>
#include <bits/stdc++.h>
using namespace std;
using namespace atcoder;
using mint = modint998244353;
#define rep(i,n) for (int i = 0; i < (n); ++i)
#define Inf 1000000000



int main(){
	
	int _t;
	cin>>_t;
	
	rep(_,_t){
		long long N,M;
		cin>>N>>M;
		
		vector<long long> a(N);
		rep(i,N)cin>>a[i];
		a.insert(a.begin(),M);
		a.push_back(0LL);
		vector<long long> b(a.size(),0);
		b[0] = M;
		rep(i,b.size()-2){
			long long x = max(0LL,a[i+1]-b[i+1]);
			x = min(x,b[i]);
			b[i+1] += x;
			b[i+2] += b[i]-x;
		}
		if(a==b)cout<<"Yes"<<endl;
		else cout<<"No"<<endl;
	}
    return 0;
}