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ID题目提交者结果用时内存语言文件大小提交时间测评时间
#501270#5151. Bottle FlipssmyWA 0ms3828kbC++20744b2024-08-02 16:13:572024-08-02 16:13:58

Judging History

你现在查看的是最新测评结果

  • [2024-08-02 16:13:58]
  • 评测
  • 测评结果:WA
  • 用时:0ms
  • 内存:3828kb
  • [2024-08-02 16:13:57]
  • 提交

answer

#include <bits/stdc++.h>
using namespace std;
typedef pair<int, int> PII;
#define int long long

double heart(double h, double x, double pw, double pa)
{
	return 0.5 * (pw * x * x + pa * (h - x) * (h - x)) / (pw * x + pa * (h - x));
}

double search(double h, double pw, double pa)
{
	double head = 0;
	double tail = h;
	while ((tail - head) > 1e-6) 
	{
		double mid = (head + tail) / 2.0;
		if (heart(h, mid, pw, pa) < heart(h, mid + 1e-6, pw, pa))
		{
			tail = mid;
		} 
		else  
		{
			head = mid;
		}
	}
	return head;
}

signed main()
{
	ios::sync_with_stdio(false);
    cin.tie(0);cout.tie(0);
	double h, pw, pa, r;
	cin >> h >> r >> pa >> pw;
	cout << fixed << setprecision(10) << search(h, pw, pa);
}

详细

Test #1:

score: 100
Accepted
time: 0ms
memory: 3824kb

input:

22 4 1 4

output:

7.3333322406

result:

ok found '7.3333322', expected '7.3333333', error '0.0000001'

Test #2:

score: 0
Accepted
time: 0ms
memory: 3828kb

input:

7 2 655 988

output:

3.1415930986

result:

ok found '3.1415931', expected '3.1415942', error '0.0000003'

Test #3:

score: -100
Wrong Answer
time: 0ms
memory: 3824kb

input:

1 1 1 2

output:

0.4142122269

result:

wrong answer 1st numbers differ - expected: '0.4142136', found: '0.4142122', error = '0.0000013'