- #include <bits/stdc++.h>
- using namespace std;
- using ll = long long;
- const int maxn = (int)2e5+10;
- ll n, l[maxn], r[maxn];
- void solve()
- {
- cin >> n; ll ans = 0;
- for(int i = 1; i <= n; i++) cin >> l[i];
- for(int i = 1; i <= n; i++) cin >> r[i];
- for(int i = 1; i < n; i++) ans+=min(l[i+1], r[i]);
- cout << ans << "\n";
- }
- int main()
- {
- ios_base::sync_with_stdio(false); cin.tie(0);
- int t = 1; cin >> t; while(t--) solve(); return 0;
- }