package main

import . "fmt"
import . "os"
import bf "bufio"

func main() {
	rd:=bf.NewReader(Stdin)
	var t int
	Fscan(rd,&t)
	for ;t>0;t-- {
		var n,m int
		Fscan(rd,&n,&m)
		ok:=true
		s1,s2:=m,0
		for i:=0;i<n;i++ {
			var a int
			Fscan(rd,&a)
			ok = ok&& s2<=a
			d:=a-s2
			ok = ok&& d<=s1
			s1,s2=a,s1-d
		}
		ok = ok&& s1==m&&s2==0
		if ok {
			Println("Yes")
		} else {
			Println("No")
		}
	}
}