#include <bits/stdc++.h>
using namespace std;
//
#define ll long long
#define ull unsigned long long
#define mx 100010
#define mod 1000000007
#define inf INT_MAX
#define pi acos(-1.0)
#define endl '\n'
#define pb push_back
#define pll pair<ll, ll>
#define vll vector<ll>
#define vpll vector<pll>
#define fastio ios_base::sync_with_stdio(false);cin.tie(0);cout.tie(0)
//
int main() {
    ll t;
    cin >> t;
    while (t--) {
        ll n;
        cin >> n;
        ll end[n], begin[n];
        for (ll i = 0; i < n; i++) cin >> end[i];
        for (ll i = 0; i < n; i++) {
            ll a;
            cin >> a;
            begin[i] = end[i] - a + 1;
        }
        ll first = begin[n - 1], second = end[n - 1];
        //cout << first << " " << second << endl; //!
        ull tot = 0;
        for (ll i = n - 2; i >= 0; i--) {
            if (first <= end[i]) first = min(first, begin[i]);
            else {
                ll temp = second - first + 1;
                tot += (temp * (temp + 1)) / 2;
                first = begin[i], second = end[i];
            }
        }
        tot += ((second - first + 1) * (second - first + 2)) / 2;
        cout << tot << endl;
    }
}