#include <bits/stdc++.h>
using namespace std;
const int PRECISION = 3;
double calc_r(pair<double, double> a, double bx) {
return (a.first - bx) * (a.first - bx) / (4 * a.second);
}
int main(){
long long n;
cin >> n;
vector<double> final_radius(n);
stack<pair<double, double>> to_check;
for(int i=0; i<n; i++){
double x, r;
cin >> x >> r;
double max_r = r;
while (!to_check.empty()) {
pair<double, double> last = to_check.top();
double to_last_r = calc_r(last, x);
max_r = min(max_r, to_last_r);
/*
* if current maximum radius >= radius of the last balloon, we can
* remove the last balloon since it will never be touched by any
* new balloons other than the current one
*/
if (max_r >= last.second) {
to_check.pop();
// check the next balloon saved which will possibly reduce max_r
continue;
}
/*
* otherwise, the current balloon is smaller than the last saved
* balloon and we can stop checking
*/
else {
break;
}
to_check.push({x, max_r});
final_radius[i] = max_r;
}
}
cout << fixed << setprecision(PRECISION);
for (double &r : final_radius) { cout << r << "\n"; }
return 0;
}
