ee1e8abd87
* feat(tools): add seed/solution restore script * chore(curriculum): remove empty sections' markers * chore(curriculum): add seed + solution to Chinese * chore: remove old formatter * fix: update getChallenges parse translated challenges separately, without reference to the source * chore(curriculum): add dashedName to English * chore(curriculum): add dashedName to Chinese * refactor: remove unused challenge property 'name' * fix: relax dashedName requirement * fix: stray tag Remove stray `pre` tag from challenge file. Signed-off-by: nhcarrigan <nhcarrigan@gmail.com> Co-authored-by: nhcarrigan <nhcarrigan@gmail.com>
43 lines
900 B
Markdown
43 lines
900 B
Markdown
---
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id: 5900f5411000cf542c510053
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title: 问题469：空椅子
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challengeType: 5
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videoUrl: ''
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dashedName: problem-469-empty-chairs
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---
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# --description--
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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。
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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。
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找到E（1018）。将答案四舍五入到小数点后十四位，形式为0.abcdefghijklmn。
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# --hints--
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`euler469()`应该返回0.56766764161831。
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```js
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assert.strictEqual(euler469(), 0.56766764161831);
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```
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# --seed--
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## --seed-contents--
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```js
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function euler469() {
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return true;
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}
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euler469();
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```
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# --solutions--
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```js
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// solution required
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```
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