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python快速排序代码实例

WBOY
WBOYOriginal
2016-06-16 08:46:151314browse

一、 算法描述:

1.先从数列中取出一个数作为基准数。
2.分区过程,将比这个数大的数全放到它的右边,小于或等于它的数全放到它的左边。
3.再对左右区间重复第二步,直到各区间只有一个数。

 二、python快速排序代码

复制代码 代码如下:

#!/usr/bin/python
# -*- coding: utf-8 -*-

def sub_sort(array,low,high):
    key = array[low]
    while low         while low = key:
            high -= 1
        while low             array[low] = array[high]
            low += 1
            array[high] = array[low]
    array[low] = key
    return low


def quick_sort(array,low,high):
     if low         key_index = sub_sort(array,low,high)
        quick_sort(array,low,key_index)
        quick_sort(array,key_index+1,high)


if __name__ == '__main__':
    array = [8,10,9,6,4,16,5,13,26,18,2,45,34,23,1,7,3]
    print array
    quick_sort(array,0,len(array)-1)
    print array

结果:
[8, 10, 9, 6, 4, 16, 5, 13, 26, 18, 2, 45, 34, 23, 1, 7, 3]
[1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 13, 16, 18, 23, 26, 34, 45]

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