def solve():
    _ = input()
    a = map(int, input().split())
    b = input()
    r = sorted(zip(b,a))
    for i, (c, v) in enumerate(r, 1):
        if c == 'B' and i>v or c=='R' and i<v:
            return 'NO'
    return 'YES'


for _ in range(int(input())):
    print(solve())