t=int(input())
 
for test in range(t):
    n=int(input())
    order=list(map(int,input().strip().split()))
    q_side=[]
    q1=[]
    q2=order
    expected=1
    while q2!=[]:
        if q2[-1]==expected:
            q1.append(q2.pop())
            expected+=1
        else:
            q_side.append(q2.pop())
        while q_side!=[]:
            if q_side[-1]==expected:
                q1.append(q_side.pop())
                expected+=1
            else:
                break
        if q_side!=sorted(q_side,reverse=True):
            break
        elif q_side==[0]:
            break
        else:
            pass
 
    if q_side==[]:
        print("yes")
    else:
        print("no")
 

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5
3 4 1 2 5
5
5 1 2 4 3