// IOI 2021
#include <bits/stdc++.h>
using namespace std;
#define endl '\n'
#define ends ' '
#define die(x) return cout << x << endl, 0
#define all(v) v.begin(), v.end()
#define sz(x) (int)(x.size())
void debug_out() { cerr << endl; }
template <typename Head, typename... Tail>
void debug_out(Head H, Tail... T) { cerr << ends << H; debug_out(T...); }
#define debug(...) cerr << "{" << #__VA_ARGS__ << "}:", debug_out(__VA_ARGS__)
typedef long long ll;
typedef pair<int, int> pii;
const ll INF = 1e9;
const ll MOD = 1e9 + 7;
////////////////////////////////////////////////////////////////////
const int N = 2e5 + 3;
typedef long double ld;
int X[N];
ld R[N];
stack<int> S;
ld GetRad(int dis, ld r) { return 1LL * dis * dis / r / 4; }
int main() {
ios::sync_with_stdio(0), cin.tie(0), cout.tie(0);
int n; cin >> n;
for (int i = 0; i < n; i++) cin >> X[i] >> R[i];
for (int i = 0; i < n; i++) {
while (!S.empty()) {
int l = S.top();
ld r = GetRad(X[i] - X[l], R[l]);
if (r < R[i]) R[i] = r;
if (R[i] > R[l]) S.pop(); else break;
}
S.push(i);
cout << fixed << setprecision(3) << R[i] << endl;
}
return 0;
}
