#include <bits/stdc++.h>
#define pii pair<int, int>
using namespace std;

const int SZ = 1 << 20;
int A[SZ], B[SZ], SA[SZ], SB[SZ];

struct Seg {
	int T[SZ << 1];
	Seg() {
		memset(T, 0xf3, sizeof(T));
	}
	void Update(int i, int v, bool set = 0) {
		i += SZ - 1;
		T[i] = max(T[i], v);
		if (set) T[i] = v;
		while (i >>= 1) T[i] = max(T[i * 2], T[i * 2 + 1]);
	}
	int Query(int L, int R, int sL = 1, int sR = SZ, int n = 1) {
		if (R < sL || sR < L) return -1E9;
		if (L <= sL && sR <= R) return T[n];
		int mid = (sL + sR) >> 1;
		return max(Query(L, R, sL, mid, n * 2), Query(L, R, mid + 1, sR, n * 2 + 1));
	}
} TL, TR;

int Solve(int N, int M, int a, int b) {
	vector<int> PA(N + 2), PB(M + 2);
	for (int i = N; i > 0; --i) PA[i] = PA[i + 1] + (A[i] == b);
	for (int i = M; i > 0; --i) PB[i] = PB[i + 1] + (B[i] == b);

	vector<int> OA, OB;
	for (int i = 1; i <= N; ++i) if (A[i] == a) OA.push_back(i);
	for (int i = 1; i <= M; ++i) if (B[i] == a) OB.push_back(i);

	int ret = min(PA[1], PB[1]);
	for (int i = 0; i < min(OA.size(), OB.size()); ++i) {
		int n1 = OA[i], n2 = OB[i];
		ret = max(ret, i + 1 + min(PA[n1 + 1], PB[n2 + 1]));
	}

	return ret;
}

int main() {
	ios::sync_with_stdio(0); cin.tie(0);
	int _T;
	cin >> _T;
	while (_T--) {
		int N, M;
		cin >> N >> M;
		vector<int> P1[2], P3[2];
		for (int i = 1; i <= N; ++i) {
			cin >> A[i];
			if (A[i] == 1) P1[0].push_back(i);
			SA[i] = SA[i - 1] + (A[i] == 2);
			if (A[i] == 3) P3[0].push_back(i);
		}
		for (int i = 1; i <= M; ++i) {
			cin >> B[i];
			if (B[i] == 1) P1[1].push_back(i);
			SB[i] = SB[i - 1] + (B[i] == 2);
			if (B[i] == 3) P3[1].push_back(i);
		}

		int ans = 0;
		ans = max(ans, (int)min(P1[0].size(), P1[1].size()));
		ans = max(ans, min(SA[N], SB[M]));
		ans = max(ans, (int)min(P3[0].size(), P3[1].size()));
		ans = max(ans, Solve(N, M, 1, 2));
		ans = max(ans, Solve(N, M, 1, 3));
		ans = max(ans, Solve(N, M, 2, 3));

		vector<tuple<int, int, int>> P;
		for (int i = 0; i < min(P1[0].size(), P1[1].size()); ++i) {
			P.emplace_back(P1[0][i], P1[1][i], 1);
		}
		for (int i = 0; i < min(P3[0].size(), P3[1].size()); ++i) {
			P.emplace_back(P3[0][P3[0].size() - 1 - i], P3[1][P3[1].size() - 1 - i], 3);
		}
		sort(P.begin(), P.end());

		vector<int> U = {-(1 << 30)};
		for (auto [a, b, n] : P) U.push_back(SB[b] - SA[a]);
		sort(U.begin(), U.end());
		U.erase(unique(U.begin(), U.end()), U.end());

		int c1 = 0, c3 = min(P3[0].size(), P3[1].size());
		for (auto [a, b, n] : P) {
			// cout << a << ' ' << b << ' ' << n << '\n';
			int t = SB[b] - SA[a];
			int tp = lower_bound(U.begin(), U.end(), t) - U.begin();

			if (n == 1) {
				c1++;
				TL.Update(tp, c1 - SA[a]);
				TR.Update(tp, c1 - SB[b]);
			}
			else {
				ans = max(ans, TL.Query(1, tp) + SA[a] + c3);
				ans = max(ans, TR.Query(tp, SZ) + SB[b] + c3);
				c3--;
			}
		}

		cout << ans << '\n';

		for (int i = 1; i <= U.size(); ++i) {
			TL.Update(i, -1e9, 1);
			TR.Update(i, -1e9, 1);
		}
	}
	return 0;
}