2018-10-10 18:03:03 -04:00
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---
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id: 5900f4411000cf542c50ff54
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challengeType: 5
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title: 'Problem 213: Flea Circus'
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videoUrl: ''
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localeTitle: 问题213：跳蚤马戏团
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---
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## Description
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<section id="description">一个30×30的正方形网格包含900个跳蚤，最初是每平方一个跳蚤。当响铃响起时，每个跳蚤随机跳到相邻的广场（通常有4种可能，除了网格边缘或角落处的跳蚤）。 <p>在响铃50次后，预计的未占用方格数量是多少？将您的答案四舍五入到小数点后六位。 </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>euler213()</code>应返回330.721154。
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2020-02-18 01:40:55 +09:00
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testString: assert.strictEqual(euler213(), 330.721154);
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2018-10-10 18:03:03 -04:00
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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 euler213() {
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// Good luck!
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return true;
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}
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euler213();
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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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2020-08-13 17:24:35 +02:00
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/section>
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