#include <bits/stdc++.h>
#define ll long long
#define pb push_back
#define S second
#define F first
#define all(x) (x).begin(), (x).end()
#define el "\n"
#define fo(i,a,b) for(int i =a;i<=b;i++)
#define fo1(i,a,b) for(int i =a;i>=b;i--)
#define bit(mask,i) ((mask>>i)&1)
#define pi pair<ll,ll>
#define NAME ""
using namespace std;
const int MAXN = 1e6+5;
const ll MOD = 1e9+7;
const int maxp = 2e7;
double n,a[MAXN],res,m,k,t,r[MAXN];
vector<ll> adj[MAXN];
deque<ll> deq;
double maxRadius(double x,double y,double x1) {
return ((x-x1)*(x-x1)) / (4*y);
}
void inp() {
cin >> n;
fo(i,1,n){
cin >> a[i] >> r[i];
}
}
void solve() {
fo(i,1,n) {
while(!deq.empty() && r[deq.front()]<= r[i])deq.pop_front();
double temp = r[i];
// if(!deq.empty())cout << maxRadius(a[deq.front()],r[deq.front()], a[i])<< el;
if(!deq.empty()) temp = min(temp,maxRadius(a[deq.front()],r[deq.front()], a[i]));
deq.push_back(i);
r[i]=temp;
cout << setprecision(3)<<fixed << r[i] << el;
}
}
int main() {
ios_base::sync_with_stdio(0);
cin.tie(0);
// freopen(NAME".INP", "r", stdin);
// freopen(NAME".OUT", "w", stdout);
inp();
solve();
return 0;
}
