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# Author Problem Lang Verdict Time Memory Sent Judged  
213988640 Practice:
TravellerAK 		1607D - 22 PyPy 3-64 Accepted 842 ms 46256 KB 2023-07-16 09:00:55 2023-07-16 09:00:55
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for f in range(int(input())):n=int(input());a=[(c,int(x))for x,c in zip(input().split(),input())];print('YES')if all((x[0] =='B'and x[1]>=i)or(x[0]=='R'and x[1]<=i)for i,x in enumerate(sorted(a),start=1))else print('NO')
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