import collections
T = int(input())
for _ in range(T):
    N = int(input())
    A = list(map(int, input().split()))
    C = collections.Counter(A)
    ans = C[0]==C[2] and C[1]<N
    temp = 0
    mitemp = 0
    matemp = 0
    for i in range(N):
        if A[i]==A[i-1] and A[i]!=1:
            ans = False
        temp+=A[i]-1
        mitemp = min(temp,mitemp)
        matemp = max(temp,matemp)
        if matemp-mitemp>1:
            ans = False
    if ans:
        print('Yes')
    else:
        print('No')