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			69 lines
		
	
	
		
			1.2 KiB
		
	
	
	
		
			Markdown
		
	
	
	
	
	
			
		
		
	
	
			69 lines
		
	
	
		
			1.2 KiB
		
	
	
	
		
			Markdown
		
	
	
	
	
	
| ---
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| id: 5900f5181000cf542c51002a
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| challengeType: 5
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| title: 'Problem 427: n-sequences'
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| videoUrl: ''
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| localeTitle: 问题427:n序列
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| ---
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| 
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| ## Description
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| <section id="description">
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| 整数序列S = {si}如果具有n个元素,则每个元素满足1≤si≤n,则称为n序列。 因此,总共有nn个不同的n序列。
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| 例如,序列S = {1、5、5、10、7、7、7、2、3、7}是10个序列。
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| 
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| 对于任何序列S,令L(S)为具有相同值的S的最长连续存在的长度。
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| 例如,对于上面给定的序列S,由于三个连续的7,L(S)= 3。
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| 
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| 对于所有n序列S,令f(n)= ∑ L(S)。
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| 
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| 例如,f(3)= 45,f(7)= 1403689和f(11)= 481496895121。
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| 
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| 找出f(7,500,000)mod 1 000 009。
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| </section>
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| 
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| ## Instructions
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| <section id="instructions">
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| </section>
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| 
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| ## Tests
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| <section id='tests'>
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| 
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| ```yml
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| tests:
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|   - text: <code>euler427()</code>应该返回97138867。
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|     testString: assert.strictEqual(euler427(), 97138867);
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| 
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| ```
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| 
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| </section>
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| 
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| ## Challenge Seed
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| <section id='challengeSeed'>
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| 
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| <div id='js-seed'>
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| 
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| ```js
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| function euler427() {
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|   // Good luck!
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|   return true;
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| }
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| 
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| euler427();
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| 
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| ```
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| 
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| </div>
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| 
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| 
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| 
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| </section>
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| 
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| ## Solution
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| <section id='solution'>
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| 
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| ```js
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| // solution required
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| ```
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| 
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| /section>
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