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# Quicksort
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# Quicksort
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_Read this in other languages:_
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[_简体中文_](README.zh-CN.md)
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Quicksort is a divide and conquer algorithm.
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Quicksort is a divide and conquer algorithm.
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Quicksort first divides a large array into two smaller
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Quicksort first divides a large array into two smaller
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sub-arrays: the low elements and the high elements.
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sub-arrays: the low elements and the high elements.
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# 快速排序
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快速排序是一种分而治之的算法。快速排序首先将一个大数组分成两个较小的子数组:比某个数小的元素和比某个数大的元素。然后快速排序可以递归地对子数组进行排序。
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步骤是:
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1. 从数组中选择一个元素,称为基点
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2. 分区:对数组重新排序,使所有值小于基点的元素都在它左边,而所有值大于基点的元素都在它右边(相等的值可以放在任何一边)。在此分区之后,基点处于其最终位置(左边和右边的中间位置)。这称为分区操作。
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3. 递归地将上述步骤应用于左边的数组和右边的数组。
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快速排序算法的动画可视化。水平线是基点值。
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![Quicksort](https://upload.wikimedia.org/wikipedia/commons/6/6a/Sorting_quicksort_anim.gif)
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## 复杂度
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| Name | Best | Average | Worst | Memory | Stable | Comments |
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| -------------- | :-----------: | :-----------: | :-----------: | :----: | :----: | :------------------------------------------------------------ |
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| **Quick sort** | n log(n) | n log(n) | n<sup>2</sup> | log(n) | No | Quicksort is usually done in-place with O(log(n)) stack space |
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## 引用
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- [Wikipedia](https://en.wikipedia.org/wiki/Quicksort)
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- [YouTube](https://www.youtube.com/watch?v=SLauY6PpjW4&index=28&list=PLLXdhg_r2hKA7DPDsunoDZ-Z769jWn4R8)
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