利用栈非递归实现块排

Posted 2020-10-31 每天学习一点点

递归实现块排：快速排序+随机快排

 

非递归实现块排具体思路如下图：

 

# -*- coding:utf-8 -*-
def quickSort(list):
    stack=[0]
    stack.append(len(list)-1)
    #利用栈存储下标
    while stack:
        j=stack.pop()
        i=stack.pop()
        mid=sort(i,j,list)
        if mid>i+1:
            stack.append(i)
            stack.append(mid-1)
        if mid<j-1:
            stack.append(mid+1)
            stack.append(j)
        # print stack
#一次排序，返回下标
def sort(low,hight,list):
    if (low>hight):
        return
    j=hight
    i=low
    temp=list[low]
    while i!=j:
        while list[j]>=temp and i<j:
            j-=1
        while list[i]<=temp and i<j:
            i+=1
        if i<j:
            k=list[i]
            list[i]=list[j]
            list[j]=k
    list[low]=list[i]
    list[i]=temp
    print list
    return i
list=[5,8,9,2,1,9,6,5]
quickSort(list)
print list