#include<bits/stdc++.h>
using ll = long long;
using std::cin;
using std::cout;
const int N = 200005;
int a[N], b[N];
int main() {
	std::ios::sync_with_stdio(false), cin.tie(0);
	int t; cin >> t;
	for(int i = 0;i < t;++i) {
		int n;
		cin >> n;
		for(int i = 1;i <= n;++i) cin >> a[i];
		for(int i = 1;i <= n;++i) cin >> b[i];
		ll s0 = 0, s1 = 0, s2 = 0;
		for(int i = 1;i <= n;++i) {
			s0 += a[i];
			if(i <= n / 2 + 1) {
				s1 += a[i] + b[i];
			}
			if(i <= n / 2) {
				s2 += a[i] + b[i];
			}
		}
		cout << std::max(std::min(s0, s1), s2) << '\n';
	}
}