이 제출은 이전 버전의 oj.uz에서 채점하였습니다. 현재는 제출 당시와는 다른 서버에서 채점을 하기 때문에, 다시 제출하면 결과가 달라질 수도 있습니다.
#include <bits/stdc++.h>
using namespace std;
stack<pair<long double, long double> > s;
int main()
{
ios::sync_with_stdio(0);
cin.tie(0);
cout.tie(0);
int n;
cin >> n;
while (n--)
{
long double x, r;
cin >> x >> r;
while (s.size())
{
long double k=(x-s.top().first)*(x-s.top().first)/4.0/s.top().second;
if (r<k)
break;
r=k;
s.pop();
}
cout << fixed << setprecision(3) << r << '\n';
while (s.size() && s.top().second<=r)
s.pop();
s.push({x, r});
}
}
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