#include<bits/stdc++.h> using namespace std; using ll = long long; const int inf = 1e9; const double S = 1.2; double kw(double a){ return a * a; } int main(){ int n; cin >> n; vector<pair<int,double>>V; for(int i = 0; i < n; i++){ int x; double r; cin >> x >> r; for(auto j : V){ r = min(r, kw(x - j.first) / (4 * j.second)); } while(!V.empty() && V.back().second <= r * S)V.pop_back(); V.push_back({x,r}); cout << fixed << setprecision(4) << r << '\n'; } }