T=int(input())
ans=[]
for _ in range(T):
    N=int(input())
    H=list(map(int,input().split()))
    l=[]
    for i in range(1,N-1):
        if H[i-1]<H[i] and H[i]>H[i+1]:
            l.append(i)
        elif H[i-1]>H[i] and H[i]<H[i+1]:
            l.append(i)
    if len(l)==3 and H[l[0]-1]>H[l[0]] and H[l[0]]<H[l[0]+1]:
        ans.append('Yes')
    else:
        ans.append('No')

import sys
sys.stdout.write('\n'.join(map(str,ans))+'\n')