/*
Khangnh's code
“You can either experience the pain of discipline or the pain of regret.
The choice is yours.”
*/
// - Only when necessary :d
// #pragma GCC optimize("Ofast")
// #pragma GCC optimize("unroll-loops")
// #pragma GCC target("avx,avx2,fma")
#include <bits/stdc++.h>
using namespace std;
#define fileopen(a, b) freopen(((string)a + ".inp").c_str(), "r", stdin); freopen(((string)b + ".out").c_str(), "w", stdout);
#define ll long long
#define ld long double
#define int long long
#define fi first
#define se second
#define pb push_back
#define pf push_front
#define pob pop_back
#define pof pop_front
typedef pair<int, int> pii;
const ll mod = 1e9 + 7;
const ll inf = 1e9 + 7;
const double eps = 1e-9;
int n;
int x[200005];
ld r[200005];
stack<pair<int, ld>> st;
ld inflate(int x0, ld r0) {
while (!st.empty()) {
pair<int, ld> k = st.top();
int tmp = (k.fi - x0)*(k.fi - x0);
r0 = min(r0, tmp/(4*k.se));
if (r0 >= k.se) st.pop();
else break;
}
st.push({x0, r0});
return r0;
}
void solve() {
cin >> n;
for (int i = 1; i <= n; ++i) cin >> x[i] >> r[i];
cout << fixed << setprecision(3);
for (int i = 1; i <= n; ++i) cout << inflate(x[i], r[i]) << "\n";
}
signed main() {
#ifdef LOCAL
fileopen("input", "output");
auto start = clock();
#endif
#ifndef LOCAL
// fileopen("LAH", "LAH");
#endif
ios_base::sync_with_stdio(0); cin.tie(0); cout.tie(0);
int t = 1;
// cin >> t;
while (t--) solve();
#ifdef LOCAL
auto end = clock();
cout << "\n\nExecution time : " << double(end - start)/CLOCKS_PER_SEC << "[s]";
#endif
return 0;
}
