排序补充（了解）

Posted 2020-10-23 Sober--

#希尔排序
def insert_sort(li):
    for i in range(1, len(li)):
        # i 表示无序区第一个数
        tmp = li[i] # 摸到的牌
        j = i - 1 # j 指向有序区最后位置
        while li[j] > tmp and j >= 0:
            #循环终止条件： 1. li[j] <= tmp; 2. j == -1
            li[j+1] = li[j]
            j -= 1
        li[j+1] = tmp

def shell_sort(li):
    d = len(li) // 2
    while d > 0:
        for i in range(d, len(li)):
            tmp = li[i]
            j = i - d
            while li[j] > tmp and j >= 0:
                li[j+d] = li[j]
                j -= d
            li[j+d] = tmp
        d = d >> 1

#计数排序
# 0 0 1 1 2 4 3 3 1 4 5 5
import random
import copy
from timewrap import *

@cal_time
def count_sort(li, max_num = 100):
    count = [0 for i in range(max_num+1)]
    for num in li:
        count[num]+=1
    li.clear()
    for i, val in enumerate(count):
        for _ in range(val):
            li.append(i)

@cal_time
def sys_sort(li):
    li.sort()

li = [random.randint(0,100) for i in range(100000)]
li1 = copy.deepcopy(li)
count_sort(li)
sys_sort(li1)