T = int(input())
for _ in range(T):
    N, M = map(int, input().split())
    A = list(map(int, input().split()))
    dp = [0 for _ in range(N+2)]
    dp[0] = M
    dp[1] = A[0]
    dp[2] = dp[0]-dp[1]
    flag = 1
    for i in range(1, N):
        #dp[i+1] = dp[i-1]-dp[i]
        sa = A[i]-dp[i+1]
        if 0<=sa<=dp[i]:
            dp[i+1]+=sa
            dp[i+2]=dp[i]-sa
        else:
            flag = 0
            break
    print("Yes" if flag else "No")