import numpy as np
for i in"T"*int(input()):
	N,A,B=int(input()),np.array([*map(int,input().split())]),np.array([*map(int,input().split())])
	K=np.r_[0,np.cumsum(B-np.sort(A))].argmax()
	print("".join([str(i*1) for i in A.argsort()<K]))