2018-10-10 22:03:03 +00:00
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---
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id: 5900f4411000cf542c50ff54
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2020-12-16 07:37:30 +00:00
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title: 问题213:跳蚤马戏团
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2018-10-10 22:03:03 +00:00
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challengeType: 5
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videoUrl: ''
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---
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2020-12-16 07:37:30 +00:00
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# --description--
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2018-10-10 22:03:03 +00:00
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2020-12-16 07:37:30 +00:00
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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)。
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2018-10-10 22:03:03 +00:00
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2020-12-16 07:37:30 +00:00
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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。
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2018-10-10 22:03:03 +00:00
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2020-12-16 07:37:30 +00:00
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# --hints--
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2018-10-10 22:03:03 +00:00
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2020-12-16 07:37:30 +00:00
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`euler213()`应返回330.721154。
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2018-10-10 22:03:03 +00:00
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```js
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2020-12-16 07:37:30 +00:00
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assert.strictEqual(euler213(), 330.721154);
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2018-10-10 22:03:03 +00:00
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```
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2020-12-16 07:37:30 +00:00
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# --solutions--
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2020-08-13 15:24:35 +00:00
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