2047c.cpp

#pragma optimize("O3")

#include <bits/stdc++.h>
using namespace std;

#define all(x) begin(x), end(x)
typedef long long ll;
typedef pair<int, int> pii;
typedef pair<ll, ll> pll;
typedef vector<int> vi;
typedef vector<vi> vvi;
typedef vector<ll> vll;
typedef vector<vll> vvll;
typedef vector<bool> vb;
typedef vector<vb> vvb;

int main() {
    cin.tie(0)->sync_with_stdio(0);

    int t; cin >> t;
    while (t--) {
        int n; cin >> n;
        vi a(n), b(n);
        for (int i = 0; i < n; i++) {
            cin >> a[i];
        }
        for (int i = 0; i < n; i++) {
            cin >> b[i];
        }

        ll sum = 0;
        for (int i = 0; i < n; i++) {
            sum += max(a[i], b[i]);
        }

        ll ans = LLONG_MIN;
        for (int i = 0; i < n; i++) {
            ans = max(ans, sum + min(a[i], b[i]));
        }
        cout << ans << endl;
    }
}