56 lines
1.2 KiB
Markdown
56 lines
1.2 KiB
Markdown
---
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id: 5900f5411000cf542c510053
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challengeType: 5
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title: 'Problem 469: Empty chairs'
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videoUrl: ''
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localeTitle: 问题469：空椅子
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---
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## Description
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<section id="description">在一个房间里，N个椅子摆放在圆桌旁。骑士一个接一个地进入房间，随意选择一把可用的空椅子。为了拥有足够的肘部空间，骑士总是在彼此之间留下至少一把空座椅。 <p>当没有任何合适的椅子时，确定空椅子的分数C.我们还将E（N）定义为C的期望值。我们可以验证E（4）= 1/2和E（6）= 5/9。 </p><p>找到E（1018）。将答案四舍五入到小数点后十四位，形式为0.abcdefghijklmn。 </p></section>
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## Instructions
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<section id="instructions">
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</section>
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## Tests
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<section id='tests'>
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```yml
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tests:
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- text: <code>euler469()</code>应该返回0.56766764161831。
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testString: 'assert.strictEqual(euler469(), 0.56766764161831, "<code>euler469()</code> should return 0.56766764161831.");'
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```
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</section>
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## Challenge Seed
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<section id='challengeSeed'>
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<div id='js-seed'>
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```js
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function euler469() {
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// Good luck!
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return true;
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}
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euler469();
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```
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</div>
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</section>
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## Solution
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<section id='solution'>
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```js
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// solution required
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```
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</section>
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