Submission #1285703

#	Time	Username	Problem	Language	Result	Execution time	Memory
1285703		thanhliem40	Balloons (CEOI11_bal)	C++20	100 / 100	88 ms	6680 KiB

bal

#include<bits/stdc++.h>
#define ll long long
using namespace std;
ll n;
ll x[200001];
double r[200001];
double ans[200001];
stack<pair<double,double>> st;
double cal(double ir,ll ix,ll jx)
{
	return (double)((jx-ix)*(jx-ix))/(4*ir);
}
int main()
{
	ios_base::sync_with_stdio(0);
	cin.tie(0);
	//freopen("BALLOONS.INP","r",stdin);
	//freopen("BALLOONS.OUT","w",stdout);
	cin >> n;
	for(ll i=1;i<=n;i++)
	{
		cin >> x[i] >> r[i];
	}
	for(ll i=1;i<=n;i++)
	{
		double res=r[i];
		while(!st.empty())
		{
			res=min(res,cal(st.top().second,st.top().first,x[i]));
			if(res>=st.top().second)
			{
				st.pop();
				continue;
			}
			else
			{
				break;
			}
		}
		ans[i]=res;
		st.push({x[i],ans[i]});
	}
	for(ll i=1;i<=n;i++)
	{
		cout << setprecision(3) << fixed << ans[i] << '\n';
	}
}

• 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