T = int(input())
for _ in range(T):
    N,M = map(int,input().split())
    A = list(map(int,input().split()))
    A = [M]+A
    flag = "Yes"
    b = 0
    for i in range(N):
        if A[i+1]<b:
            flag = "No"
            break
        if i<N-1:
            b = A[i]-A[i+1]+b
    if A[N-1]!=A[N]-b:
        flag = "No"
    print(flag)