56 lines
1.7 KiB
Markdown
56 lines
1.7 KiB
Markdown
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---
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id: 5900f54a1000cf542c51005c
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challengeType: 5
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title: 'Problem 477: Number Sequence Game'
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videoUrl: ''
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localeTitle: 问题477：数字序列游戏
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---
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## Description
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<section id="description">数字序列游戏以写在一行上的N个数字的序列S开始。两名球员交替轮流。在轮到他时，玩家必须选择并删除序列中剩余的第一个或最后一个数字。球员得分是他所取得的所有数字的总和。每个玩家都试图最大化自己的总和。如果N = 4并且S = {1,2,10,3}，则每个玩家最大化他的得分如下：玩家1：移除第一个数字（1）玩家2：从剩余序列移除最后一个数字（3）玩家1：从剩余序列中移除最后一个号码（10）玩家2：移除剩余号码（2）玩家1得分为1 + 10 = 11.如果两个玩家都遵循，则F（N）为玩家1的得分序列的最优策略S = {s1，s2，...，sN}定义为：s1 = 0 si + 1 =（si2 + 45）modulo 1 000 000 007序列以S = {0,45,2070开头，4284945,753524550,478107844,894218625，...}。给出F（2）= 45，F（4）= 4284990，F（100）= 26365463243，F（104）= 2495838522951。求F（108）。 </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>euler477()</code>应该返回25044905874565164。
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testString: 'assert.strictEqual(euler477(), 25044905874565164, "<code>euler477()</code> should return 25044905874565164.");'
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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 euler477() {
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// Good luck!
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return true;
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}
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euler477();
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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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