Submission #1221200

#	Time	Username	Problem	Language	Result	Execution time	Memory
1221200		boclobanchat	Balloons (CEOI11_bal)	C++20	20 / 100	1629 ms	2084 KiB

bal

#include<bits/stdc++.h>
using namespace std;
struct comp
{
	bool operator()(pair<double,double> a,pair<double,double> b)
	{
		return a.first+a.second<b.first+b.second;
	}
};
priority_queue< pair<double,double>,vector< pair<double,double> >,comp > pq;
double dis(double x1,double y1,double x2,double y2)
{
	return sqrt((x1-x2)*(x1-x2)+(y1-y2)*(y1-y2));
}
double get(pair<double,double> p,double X,double R)
{
	double lt=0,rt=R,ans=0;
	while(rt-lt>1e-5)
	{
		double mid=(lt+rt)/2;
		if(dis(p.first,p.second,X,mid)>=mid+p.second) lt=ans=mid;
		else rt=mid;
	}
	return ans;
}
int main()
{
    ios::sync_with_stdio(0);
    cin.tie(0);
    cout.tie(0);
    int n;
    cin>>n;
    cout<<setprecision(3)<<fixed;
    for(int i=1;i<=n;i++)
    {
    	long long X,R;
    	cin>>X>>R;
    	if(i==1)
    	{
    		cout<<R<<"\n";
    		pq.push({X,R});
		}
		else
		{
			priority_queue< pair<double,double>,vector< pair<double,double> >,comp > res=pq;
			double ans=R;
			while(!res.empty()) ans=min(ans,get(res.top(),X,R)),res.pop();
			cout<<ans<<"\n";
			pq.push({X,ans});
			if(pq.size()>22) pq.pop();
		}
	}
}

• Subtask 1: 10 / 10
• Subtask 2: 10 / 10
• Subtask 3: 0 / 10
• Subtask 4: 0 / 10
• Subtask 5: 0 / 10
• Subtask 6: 0 / 10
• Subtask 7: 0 / 10
• Subtask 8: 0 / 10
• Subtask 9: 0 / 10
• Subtask 10: 0 / 10