62 lines
1.8 KiB
Markdown
62 lines
1.8 KiB
Markdown
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---
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id: 5900f3841000cf542c50fe97
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challengeType: 5
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title: 'Problem 24: Lexicographic permutations'
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videoUrl: ''
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localeTitle: 问题24：字典排列
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---
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## Description
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<section id="description">置换是对象的有序排列。例如，3124是数字1,2,3和4的一种可能的排列。如果所有排列都以数字或字母顺序列出，我们称之为词典顺序。字典排列0,1和2是： <div style="text-align: center;"> 012 021 102 120 201 210 </div>数字0,1,2,3,4,5,6,7,8和9的第<var>n</var>个词典排列是什么？ </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>lexicographicPermutations(699999)</code>应该返回1938246570。
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testString: 'assert(lexicographicPermutations(699999) == 1938246570, "<code>lexicographicPermutations(699999)</code> should return 1938246570.");'
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- text: <code>lexicographicPermutations(899999)</code>应该返回2536987410。
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testString: 'assert(lexicographicPermutations(899999) == 2536987410, "<code>lexicographicPermutations(899999)</code> should return 2536987410.");'
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- text: <code>lexicographicPermutations(900000)</code>应该返回2537014689。
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testString: 'assert(lexicographicPermutations(900000) == 2537014689, "<code>lexicographicPermutations(900000)</code> should return 2537014689.");'
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- text: <code>lexicographicPermutations(999999)</code>应该返回2783915460。
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testString: 'assert(lexicographicPermutations(999999) == 2783915460, "<code>lexicographicPermutations(999999)</code> should return 2783915460.");'
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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 lexicographicPermutations(n) {
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// Good luck!
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return n;
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}
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lexicographicPermutations(999999);
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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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