#include <bits/stdc++.h>
#define fast ios::sync_with_stdio(false)
#define ct cin.tie(nullptr)
#define ll long long
#define nl '\n'
#define newline cout<<'\n'
#define yes cout<<"YES"<<'\n'
#define no cout<<"NO"<<'\n'
using namespace std;
void solve()
{


}
int main()
{
    fast;
    ct;
   int t;
    cin>>t;
    while(t--)
    {
        int n;
        cin>>n;
        vector<int>arrb(n),arrs(n);
        for(auto& x:arrb)
            cin>>x;
        for(auto& x:arrs)
            cin>>x;
        int mn=*min_element(arrb.begin(),arrb.end());
        int mx = *max_element(arrs.begin(),arrs.end());
        cout<<mx-mn<<nl;
    }
}