2018-10-10 22:03:03 +00:00
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---
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id: 5900f4c21000cf542c50ffd4
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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340:疯狂的功能
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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">对于固定整数a,b,c,定义疯狂函数F(n)如下:F(n)= n - c表示所有n> b F(n)= F(a + F(a + F(a +)所有n≤b的F(a + n))))。 <p>另外,定义S(a,b,c)=。 </p><p>例如,如果a = 50,b = 2000且c = 40,则F(0)= 3240并且F(2000)= 2040.此外,S(50,2000,40)= 5204240。 </p><p>找到S(217,721,127)的最后9位数。 </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>euler340()</code>应返回291504964。
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2020-02-17 16:40:55 +00:00
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testString: assert.strictEqual(euler340(), 291504964);
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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 euler340() {
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// Good luck!
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return true;
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}
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euler340();
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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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