import numpy as np
for i in"T"*int(input()):
	N,A,B=[np.array(input().split(),"q") for i in"_"*3]
	S=A.argsort();K=np.r_[0,np.cumsum(B-A[S])].argmax()
	R=np.zeros(N,int);R[S[:K]]=1
	print("".join(R.astype(str)))