#include <bits/stdc++.h>
using namespace std;
typedef long long ll;
int main() {
    ios::sync_with_stdio(0);
    cin.tie(0);
    int tt;
    cin>>tt;
    while(tt--){
        ll l,r;
        cin >>l>>r;
        ll ans=0;
        if(r>=2*l)
            ans=(r-2*l+1)*(r-2*l+2)/2;
        cout<<ans<<endl;
    }
    return 0;
}

#include <bits/stdc++.h>

using namespace std;

#define ll long long

int main() {
    ios::sync_with_stdio(0);
    cin.tie(0);
    int tt;
    cin >> tt;
    while(tt--){
        ll l, r;
        cin >> l >> r;
        ll ans = 0;
        if(r >= 2 * l)
            ans = (r - 2 * l + 1) * (r - 2 * l + 2) / 2;
        cout << ans << '\n';
    }
    return 0;
}