t = int(input())
for _ in range(t):
    n = int(input())
    h = list(map(int, input().split()))

    l = 0
    r = 0

    for i in range(1, n - 1):
        if h[i - 1] > h[i] and h[i] < h[i + 1]:
            l += 1
        elif h[i - 1] < h[i] and h[i] > h[i + 1]:
            r += 1

    print("Yes" if (l == 2 and r == 1) else "No")