56 lines
1.5 KiB
Markdown
56 lines
1.5 KiB
Markdown
|
---
|
|||
|
|
id: 5900f4f71000cf542c510009
|
|||
|
|
challengeType: 5
|
|||
|
|
title: 'Problem 394: Eating pie'
|
|||
|
|
videoUrl: ''
|
|||
|
|
localeTitle: 问题394：吃馅饼
|
|||
|
|
---
|
|||
|
|
|
|||
|
|
## Description
|
|||
|
|
<section id="description">杰夫以一种不同寻常的方式吃馅饼。馅饼是圆形的。他首先沿着半径切割馅饼中的初始切口。虽然剩下至少给定的馅饼F分数，但他执行以下程序： - 他从饼图中心到馅饼边框剩余的任何一点做两个切片，剩下的馅饼边框上的任何一点都有可能。这将把剩下的馅饼分成三块。 - 从最初的切割逆时针走，他拿出前两个馅饼并吃掉它们。当剩下不到一小部分馅饼时，他不再重复这个过程。相反，他吃剩下的所有馅饼。 <p>对于x≥1，设E（x）是Jeff重复上述过程的预期次数，F = 1 / x。可以证实E（1）= 1，E（2）≈1.2676536759，和E（7.5）≈2.1215732071。 </p><p>找到E（40）舍入到小数点后面的10位小数。 </p></section>
|
|||
|
|
|
|||
|
|
## Instructions
|
|||
|
|
<section id="instructions">
|
|||
|
|
</section>
|
|||
|
|
|
|||
|
|
## Tests
|
|||
|
|
<section id='tests'>
|
|||
|
|
|
|||
|
|
```yml
|
|||
|
|
tests:
|
|||
|
|
- text: <code>euler394()</code>应返回3.2370342194。
|
|||
|
|
testString: 'assert.strictEqual(euler394(), 3.2370342194, "<code>euler394()</code> should return 3.2370342194.");'
|
|||
|
|
|
|||
|
|
```
|
|||
|
|
|
|||
|
|
</section>
|
|||
|
|
|
|||
|
|
## Challenge Seed
|
|||
|
|
<section id='challengeSeed'>
|
|||
|
|
|
|||
|
|
<div id='js-seed'>
|
|||
|
|
|
|||
|
|
```js
|
|||
|
|
function euler394() {
|
|||
|
|
// Good luck!
|
|||
|
|
return true;
|
|||
|
|
}
|
|||
|
|
|
|||
|
|
euler394();
|
|||
|
|
|
|||
|
|
```
|
|||
|
|
|
|||
|
|
</div>
|
|||
|
|
|
|||
|
|
|
|||
|
|
|
|||
|
|
</section>
|
|||
|
|
|
|||
|
|
## Solution
|
|||
|
|
<section id='solution'>
|
|||
|
|
|
|||
|
|
```js
|
|||
|
|
// solution required
|
|||
|
|
```
|
|||
|
|
</section>
|