Submission #972625

#	Time	Username	Problem	Language	Result	Execution time	Memory
972625		iag99	Balloons (CEOI11_bal)	C++17	100 / 100	146 ms	7140 KiB

bal

#include <bits/stdc++.h>
#define long long long

using namespace std;

double calcr(pair<double,double> pr, double xc)
{
	return (pr.first-xc)*(pr.first-xc)/(4*pr.second);
}
int main() {
	ios::sync_with_stdio(false);
	cin.tie(nullptr);

	int n;
	cin>>n;
	stack<pair<double,double>> st;
	vector<double> ans(n);
	for(int i=0; i<n; i++)
	{
		double x,r;
		cin>>x>>r;
		double max_r=r;
		while(!st.empty())
		{
			pair<double,double> prev=st.top();
			double new_r=calcr(prev,x);
			max_r=min(new_r,max_r);
			if(max_r>=prev.second)
			{
				st.pop();
				continue;
			}
			else
			{
				break;
			}	
		}
		st.push({x, max_r});
		ans[i]=max_r;
	}
	cout<<fixed<<setprecision(3);
	for (double &r : ans) { cout << r << "\n"; }
	return 0;
}

• Subtask 1: 10 / 10
• Subtask 2: 10 / 10
• Subtask 3: 10 / 10
• Subtask 4: 10 / 10
• Subtask 5: 10 / 10
• Subtask 6: 10 / 10
• Subtask 7: 10 / 10
• Subtask 8: 10 / 10
• Subtask 9: 10 / 10
• Subtask 10: 10 / 10