import sys
import typing

from atcoder.segtree import SegTree

def op(x: int, y: int) -> int:
    return max(x, y)


def main() -> None:
    input = sys.stdin.buffer.readline

    ttt = int(input())

    for _ in range(ttt):
        n = int(input())

        p = list(map(int, input().split()))
        q = list(map(int, input().split()))

        for i in range(n):
            p[i] -= 1

        for i in range(n):
            q[i] -= 1

        segs = [SegTree(op, 0, n) for _ in range(n)]

        for i in range(n):
            segl = SegTree(op, 0, n)
            segh = SegTree(op, 0, n)
            res = [0] * n

            for j in range(n):
                res[j] = max(
                    segl.prod(0, q[j]),
                    segh.prod(q[j] + 1, n),
                ) + 1

                segl.set(
                    q[j],
                    segs[j].prod(0, p[i]),
                )
                segh.set(
                    q[j],
                    segs[j].prod(p[i] + 1, n),
                )

            for j in range(n):
                segs[j].set(p[i], res[j])

        ans = 0

        for i in range(n):
            ans = max(ans, segs[i].all_prod())

        print(ans)


if __name__ == "__main__":
    main()