T=int(input())
for _ in range(T):
    N=int(input())
    A=list(map(int,input().split()))
    B=list(map(int,input().split()))
    mx=now=sum(A)
    mxi=-1
    A=list(sorted([[A[i],i] for i in range(N)]))
    for i in range(N):
        nxt=now-A[i][0]+B[i]
        if nxt>mx:
            mx=nxt
            mxi=i
        now=nxt
    ans=0
    for i in range(mxi+1):
        ans+=1<<(N-1-A[i][1])
    print(bin(1<<N|ans)[3:])