#include<bits/stdc++.h> using namespace std; using ll = long long; const int inf = 1e9; const double S = 1.4; double kw(double a){ return a * a; } int main(){ int n; cin >> n; vector<pair<int,double>>V; vector<pair<int,double>>V2; double last = 0; for(int i = 0; i < n; i++){ int x; double r; cin >> x >> r; if(last * 1.4 <= x){ for(auto j : V2){ r = min(r, kw(x - j.first) / (4 * j.second)); } } else{ 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}); V2.push_back({x,r}); cout << fixed << setprecision(4) << r << '\n'; } }