s12-20160514-day17

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-->

pytho自动化开发 day17

Date:2016.05.14

    @南非波波

课程大纲：

http://www.cnblogs.com/alex3714/articles/5474411.html

一、冒泡排序算法

#!/usr/local/env python3

'''

Author:@南非波波

Blog:http://www.cnblogs.com/songqingbo/

E-mail:qingbo.song@gmail.com

'''

import random,time

#m冒泡排序

def bubble_up1(array):

    '''

    m冒泡排序算法

    :param array:

    :return: count: 6190862 time: 6.706383466720581

    '''

    count = 0

    for i in range(len(array)):

        for j in range(len(array) - 1 - i):

            if array[j] > array[j + 1]:

                temp = array[j + 1]

                array[j + 1] = array[j]

                array[j] = temp

                count += 1

    print("count:", count)

    print("array:", array)

def bubble_up2(array):

    '''

    m冒泡排序算法

    :param array:

    :return:count: 5000 time: 3.825218915939331

    '''

    count = 0

    for i in range(len(array)):

        for j in range(len(array) - 1 - i):

            big_temp = j

            if array[big_temp] > array[j + 1]:

                big_temp = j + 1

        temp = array[big_temp]

        array[i] = array[big_temp]

        array[big_temp] = temp

        count += 1

    print("count:", count)

    print("array:", array)

if __name__ == '__main__':

    array = []

    for i in range(5000):

        array.append(random.randrange(1000))

    time_start = time.time()

    bubble_up2(array)

    time_end = time.time()

    #

    print(array[0:100])

    print("time:",time_end - time_start)

二、 选择排序

def select1(array):

    '''

    选择排序算法v1

    :param array:

    :return:count: 1996750 time: 3.2961885929107666

    '''

    count = 0

    for i in range(len(array)):

        for j in range(i,len(array)):

            if array[i] > array[j]:

                temp = array[j]

                array[j] = array[i]

                array[i] = temp

                count += 1

    print("count:",count)

    print("array:",array)

def select2(array):

    '''

    选择排序算法v2

    :param array:

    :return:count: 5000 time: 2.4801418781280518

    '''

    count = 0

    for i in range(len(array)):

        smallest_index = i

        for j in range(i,len(array)):

            if array[smallest_index] > array[j]:

                smallest_index = j

        temp = array[smallest_index]

        array[smallest_index] = array[i]

        array[i] = temp

        count += 1

    print("count:",count)

    print("array:",array)

三、直接插入排序算法

def insert1(array):

    '''

    插入排序算法

    :param array:

    :return: count: 4999 time: 3.685210704803467

    '''

    count = 0

    for index in range(1, len(array)):

        current_val = array[index]  # 先记下来每次大循环走到的第几个元素的值

        position = index

        while position > 0 and array[

                    position - 1] > current_val:  # 当前元素的左边的紧靠的元素比它大,要把左边的元素一个一个的往右移一位,给当前这个值插入到左边挪一个位置出来

            array[position] = array[position - 1]  # 把左边的一个元素往右移一位

            position -= 1  # 只一次左移只能把当前元素一个位置 ,还得继续左移只到此元素放到排序好的列表的适当位置 为止

        array[position] = current_val  # 已经找到了左边排序好的列表里不小于current_val的元素的位置,把current_val放在这里

        count += 1

    print("count:", count)

    print(array)

四、快速排序

def quick_sort(array,start,end):

    '''

    快速排序算法

    :param array:

    :param start:

    :param end:

    :return:time: 0.03600192070007324

    '''

    if start >= end:

        return

    k = array[start]

    left_flag = start

    right_flag = end

    while left_flag < right_flag:

        while array[right_flag] > k:

            right_flag -= 1

        temp = array[right_flag]

        array[left_flag] = array[right_flag]

        array[right_flag] = temp

        while array[left_flag] <= k:

            left_flag += 1

        temp = array[left_flag]

        array[left_flag] = array[right_flag]

        array[right_flag] = temp

    quick_sort(array,start,left_flag - 1)

    quick_sort(array,left_flag + 1,end)