Submission #720597

#	Time	Username	Problem	Language	Result	Execution time	Memory
720597		mariowong	Balloons (CEOI11_bal)	C++14	100 / 100	528 ms	5500 KiB

bal

#include <bits/stdc++.h>
using namespace std;

int ptr;
long double sqr(long double a1){
	return a1*a1;	
}
struct ballon{
	long double xx,rr;
}a[200005];
int main(){
	ios::sync_with_stdio(false);
	int n;
	cin >> n;	
	for (int i=1;i<=n;i++){
		long double x,r;
		cin >> x >> r;
		if (i == 1){
			cout << setprecision(3) << fixed << r << "\n";
			a[++ptr]={x,r};	
		}
		else
		{
			long double ans=r;
			while (ptr > 0){
				ans=min(ans,sqr(x-a[ptr].xx)/4.0/a[ptr].rr);	
				if (ans >= a[ptr].rr) ptr--;
				else break;
			}
			cout << setprecision(3) << fixed << ans << "\n";
			a[++ptr]={x,ans};
		}
	}
	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