56 lines
1.4 KiB
Markdown
56 lines
1.4 KiB
Markdown
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---
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id: 5900f3dd1000cf542c50feef
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challengeType: 5
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title: 'Problem 112: Bouncy numbers'
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videoUrl: ''
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localeTitle: 问题112：有弹性的数字
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---
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## Description
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<section id="description">如果左边的数字没有超过数字，则从左到右工作，称为递增数字;例如，134468。同样，如果右边的数字没有超过数字，则称为递减数字;例如，66420。我们将调用一个既不增加也不减少“有弹性”数的正整数;例如，155349。显然，不会有任何低于一百的弹性数字，但只有超过一千（525）的数字超过一半是有弹性的。事实上，有弹性数字首次达到50％的最小数量是538.令人惊讶的是，有弹性的数字变得越来越普遍，当我们达到21780时，有弹性数字的比例等于90％。找出有弹性数字的比例正好为99％的最小数字。 </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>euler112()</code>应返回1587000。
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testString: 'assert.strictEqual(euler112(), 1587000, "<code>euler112()</code> should return 1587000.");'
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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 euler112() {
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// Good luck!
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return true;
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}
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euler112();
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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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