#include <bits/stdc++.h>
using namespace std;
#define endl '\n'
#define fi first
#define se second
#define For(i, l, r) for (auto i = (l); i < (r); i++)
#define ForE(i, l, r) for (auto i = (l); i <= (r); i++)
#define FordE(i, l, r) for (auto i = (l); i >= (r); i--)
#define Fora(v, a) for (auto v: (a))
#define bend(a) (a).begin(), (a).end()
#define isz(a) ((signed)(a).size())
using ll = long long;
using ld = long double;
using pii = pair <int, int>;
using vi = vector <int>;
using vpii = vector <pii>;
using vvi = vector <vi>;
const int N = 2e5 + 5;
int n;
vector <pair <int, double>> a;
signed main(){
ios_base::sync_with_stdio(0);
cin.tie(0); cout.tie(0);
// freopen("KEK.inp", "r", stdin);
// freopen("KEK.out", "w", stdout);
cout << fixed << setprecision(15);
cin >> n;
while (n--){
int x, max_r;
cin >> x >> max_r;
double r = max_r;
while (not a.empty()){
auto [tx, tr] = a.back();
r = min(r, (ll)(x - tx) * (x - tx) / (4ll * tr));
if (r < tr){
break;
}
a.pop_back();
}
a.emplace_back(x, r);
cout << r << endl;
}
}
/*
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INPUT |
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OUTPUT |
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*/
