Question

当子数组大小小于10时，我一直在尝试运行快速排序并切换到插入排序。事实证明，我没有得到排序列表。

我哪里错了？

import random
import time

m = 0

def quicksort(numList, first, last):
    if first<last:
        sizeArr = last - first + 1
        if(sizeArr < m):
            insert_sort(numList, first, last)
        else:
            mid = partition(numList, first, last)
            quicksort(numList, first, mid-1)
            quicksort(numList, mid + 1, last)

def partition(numList, first, last):
    piv = numList[last]
    i = first-1
    for j in range(first,last):
        if numList[j] < piv:
            i += 1
            temp = numList[i]
            numList[i] = numList[j]
            numList[j] = temp

    tempo = numList[i+1]
    numList[i+1] = numList[last]
    numList[last] = tempo

    return i+1

def insert_sort(numList, first, last):
    for x in range(first, last):
        key = numList[x]
        y = x-1
        while y > -1 and numList[y]> key:
            numList[y+1] = numList[y]
            y = y-1
        numList[y+1] = key

if __name__ == '__main__':
    start = time.time()
    numList = random.sample(range(5000), 100)
    m = 10
    quicksort(numList, 0, len(numList) - 1)
    print numList
    print "Time taken: " + str(time.time() - start)

输入是一些大小在100到1000000之间的随机数组。我正在使用随机生成器。

请帮帮我。

Answer 1

range(first, last+1)函数中有一个off-by-one错误。迭代:，它将正确排序。

Quicksort插入排序Python无法正常工作

1 个答案: