67 lines
2.1 KiB
Markdown
67 lines
2.1 KiB
Markdown
---
|
||
title: Hailstone sequence
|
||
id: 595608ff8bcd7a50bd490181
|
||
challengeType: 5
|
||
videoUrl: ''
|
||
localeTitle: 冰雹序列
|
||
---
|
||
|
||
## Description
|
||
<section id="description"><p> Hailstone数字序列可以从起始正整数n生成： </p>如果n为1，则序列结束。如果n是偶数，那么序列的下一个n <code>= n/2</code>如果n是奇数，那么序列的下一个n <code>= (3 * n) + 1</code> <p> （未经证实的） <a href="https://en.wikipedia.org/wiki/Collatz conjecture" title="wp：Collatz猜想">Collatz猜想</a>是任何起始编号的冰雹序列总是终止。 </p><p>冰雹序列也称为冰雹数（因为这些值通常受到多个下降和上升，如云中的冰雹），或者作为Collatz序列。 </p>任务：创建例程以生成数字的hailstone序列。使用例程表明，对于27号的冰雹序列具有开始与112个元件<code>27, 82, 41, 124</code> ，结束时用<code>8, 4, 2, 1</code>与显示具有最长冰雹序列的数目少于100,000一起序列的长度。 （但不要显示实际的序列！）参见： <a href="http://xkcd.com/710" title="链接：http：//xkcd.com/710">xkcd</a> （幽默）。 </section>
|
||
|
||
## Instructions
|
||
<section id="instructions">
|
||
</section>
|
||
|
||
## Tests
|
||
<section id='tests'>
|
||
|
||
```yml
|
||
tests:
|
||
- text: <code>hailstoneSequence</code>是一个函数。
|
||
testString: 'assert(typeof hailstoneSequence === "function", "<code>hailstoneSequence</code> is a function.");'
|
||
- text: '<code>[[27,82,41,124,8,4,2,1], [351, 77031]]</code> <code>hailstoneSequence()</code>应返回<code>[[27,82,41,124,8,4,2,1], [351, 77031]]</code>'
|
||
testString: 'assert.deepEqual(hailstoneSequence(), res, "<code>hailstoneSequence()</code> should return <code>[[27,82,41,124,8,4,2,1], [351, 77031]]</code>");'
|
||
|
||
```
|
||
|
||
</section>
|
||
|
||
## Challenge Seed
|
||
<section id='challengeSeed'>
|
||
|
||
<div id='js-seed'>
|
||
|
||
```js
|
||
// noprotect
|
||
function hailstoneSequence () {
|
||
const res = [];
|
||
// Good luck!
|
||
|
||
return res;
|
||
}
|
||
|
||
```
|
||
|
||
</div>
|
||
|
||
|
||
### After Test
|
||
<div id='js-teardown'>
|
||
|
||
```js
|
||
console.info('after the test');
|
||
```
|
||
|
||
</div>
|
||
|
||
</section>
|
||
|
||
## Solution
|
||
<section id='solution'>
|
||
|
||
```js
|
||
// solution required
|
||
```
|
||
</section>
|