#include "bits/stdc++.h"
#include <type_traits>
using namespace std;
#pragma GCC optimize("Ofast")
#pragma GCC target("avx,avx2,fma")
#pragma GCC optimization("unroll-loops")
// ============ Macros starts here ============
int recur_depth = 0;
#ifdef DEBUG
#define dbg(x) {++recur_depth; auto x_=x; --recur_depth; cerr<<string(recur_depth, '\t')<<"\e[91m"<<__func__<<":"<<__LINE__<<"\t"<<#x<<" = "<<x_<<"\e[39m"<<endl;}
#else
#define dbg(x)
#endif // DEBUG
template<typename Ostream, typename Cont>
typename enable_if<is_same<Ostream, ostream>::value, Ostream&>::type operator<<(Ostream& os, const Cont& v) {
os << "{";
for (auto& x : v) { os << x << ", "; }
return os << "}";
}
template<typename Ostream, typename ...Ts>
Ostream& operator<<(Ostream& os, const pair<Ts...>& p) {
return os << "{" << p.first << ", " << p.second << "}";
}
#define readFast \
ios_base::sync_with_stdio(false); \
cin.tie(0); \
cout.tie(0);
#ifdef LOCAL
#define read() ifstream fin("date.in.txt")
#else
#define read() readFast
#endif // LOCAL
// ============ Macros ends here ============
#define fin cin
#define ll long long
#define sz(x) (int)(x).size()
#define all(v) v.begin(), v.end()
#define output(x) (((int)(x) && cout << "YES\n") || cout << "NO\n")
#define LSB(x) (x & (-x))
#define test cout << "WORKS\n";
vector<long double> a, r;
long double calc_r(int x, int y) {
long double rb = (a[y] - a[x]) * (a[y] - a[x]) / (4 * r[x]);
return rb;
}
int main() {
read();
int n;
fin >> n;
a.resize(n);
r.resize(n);
for (int i = 0; i < n; ++i) {
fin >> a[i] >> r[i];
}
stack<int> stk;
for (int i = 0; i < n; ++i) {
while (!stk.empty()) {
long double rb = calc_r(stk.top(), i);
r[i] = min(r[i], rb);
if (r[i] >= r[stk.top()]) {
stk.pop();
} else {
break;
}
}
stk.push(i);
cout << fixed << setprecision(3) << r[i] << '\n';
}
return 0;
} /*stuff you should look for !!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!
* test the solution with the given example
* int overflow, array bounds, matrix bounds
* special cases (n=1?)
* do smth instead of nothing and stay organized
* WRITE STUFF DOWN
* DON'T GET STUCK ON ONE APPROACH
~Benq~*/
