for _ in range(int(input())):
    n = int(input())
    a = map(int, input().split())
    b = list(input())
    c = sorted(zip(b, a))
    for i, (x, y) in enumerate(c):
        if x == 'B' and y < (i + 1) or x == 'R' and y > (i + 1):
            print('NO')
            break
    else:
        print('YES')