2018-10-10 22:03:03 +00:00
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---
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id: 5900f5061000cf542c510017
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challengeType: 5
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videoUrl: ''
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2020-10-01 15:54:21 +00:00
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title: 问题409:Nim Extreme
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2018-10-10 22:03:03 +00:00
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---
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## Description
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<section id="description">设n是正整数。考虑nim位置:有n个非空桩。每堆的尺寸小于2n。没有两个桩具有相同的尺寸。设W(n)是满足上述条件的获胜nim位置的数量(如果第一个玩家具有获胜策略,则获胜的位置)。例如,W(1)= 1,W(2)= 6,W(3)= 168,W(5)= 19764360,W(100)mod 1 000 000 007 = 384777056。 <p>求W(10 000 000)mod 1 000 000 007。 </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>euler409()</code>应该返回253223948。
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2020-02-17 16:40:55 +00:00
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testString: assert.strictEqual(euler409(), 253223948);
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2018-10-10 22:03:03 +00:00
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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 euler409() {
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// Good luck!
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return true;
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}
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euler409();
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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 15:24:35 +00:00
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/section>
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