#include <bits/stdc++.h>
#define ll long long
#define F first
#define S second
#define endl '\n'
#define Endl '\n'

using namespace std;

const int N = 2e5 + 5;
int tc, n, m, a[N], b[N], c[N];

int main() {
    ios_base::sync_with_stdio(0);
    cin.tie(0); // cout.tie(0);
    cin >> tc;
    while (tc--) {
        cin >> n;
        for (int i = 0; i < n; i++) {
            cin >> a[i];
        }
        for (int i = 0; i < n; i++) {
            cin >> b[i];
        }
        for (int i = 0; i < n; i++) {
            c[i] = a[i] - b[i];
        }
        ll sum = 0;
        for (int i = 0; i < n; i++) {
            sum += max({a[i], b[i], c[i]});
        }
        cout << sum << endl;
    }

    return 0;
}