Airport Management

#include <bits/stdc++.h>

using namespace std;

#define ll     long long
#define _test   int _TEST; cin>>_TEST; while(_TEST--)

int main()
{
    _test
    {
        int n;
        cin>>n;

        map<int, int> cnt;

        vector<int> a(n), b(n);
        for(auto &e: a)     cin>>e;
        for(auto &e: b)     cin>>e;

        for(auto e: a)      cnt[e]++;
        for(auto e: b)      cnt[e]++;

        int ans = 0;

        for(auto [x, y]: cnt)
            ans = max(ans, y);

        cout<<ans<<"\n";
    }
}