B

#include <bits/stdc++.h>

using namespace std;

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

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

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

        ll int x = (*min_element(a.begin(), a.end()))*n +
                    accumulate(b.begin(), b.end(), 0ll);

        ll int y = (*min_element(b.begin(), b.end()))*n +
                    accumulate(a.begin(), a.end(), 0ll);

        cout<<min(x, y)<<"\n";
    }
}