#include<bits/stdc++.h>
#define endl        '\n'
#define F           first
#define S           second
#define pb          push_back
#define yes         cout<<"YES\n"
#define no          cout<<"NO\n"
#define all(x)      x.begin(),x.end()
#define allr(x)     x.rbegin(),x.rend()
#define error1(x)   cerr<<#x<<" = "<<(x)<<endl
#define error2(a,b) cerr<<"("<<#a<<", "<<#b<<") = ("<<(a)<<", "<<(b)<<")\n";
#define coutall(v)  for(auto &it: v) cout << it << " "; cout << endl;
using namespace std;
using ll = long long;
using ld = long double;

void solve() {
    ll n, k;
    cin >> n >> k;

    ll lo = 0, hi = k / n, mid1, mid2, ans = 0;
    while(lo <= hi) {
        mid1 = lo + (hi - lo) / 3;
        mid2 = hi - (hi - lo) / 3;

        ll val1 = (k - (mid1 * n)) * mid1;
        ll val2 = (k - (mid2 * n)) * mid2;

        if(val1 > val2) {
            hi = mid2 - 1;
            ans = mid1;
        }
        else if(val1 < val2) {
            lo = mid1 + 1;
            ans = val2;
        }
        else {
            lo = mid1 + 1;
            hi = mid2 - 1;
            ans = val1;
        }
    }
    cout << ans << endl;
    return;
}

signed main() {
    ios::sync_with_stdio(false); cin.tie(0);
    int tc = 1;
    cin >> tc;
    for (int t = 1; t <= tc; t++) {
        // cout << "Case " << t << ": ";
        solve();
    }
    return 0;
}