Python冒泡排序、快速排序、堆排序

1. 冒泡排序

def bubble_sort(array, n):
    for i in range(n):
        for j in range(1, n - i):
            if array[j - 1] > array[j]:
                array[j - 1], array[j] = array[j], array[j - 1]

2. 快速排序

def quick_sort(array, l, r):
    if l < r:
        q = partition(array, l, r)
        quick_sort(array, l, q - 1)
        quick_sort(array, q + 1, r)

def partition(array, l, r):
    x = array[r]
    i = l
    for j in range(l, r):
        if array[j] <= x:
            array[i], array[j] = array[j], array[i]
            i += 1
    array[i], array[r] = array[r], array[i]
    return i

3. 堆排序
   注意堆排序外面还有一个在下面测试部分的循环。

# 堆排序
def heap_sort(array, n, length):
    l = 2*n + 1
    r = 2*n + 2
    if l <= length - 1:
        heap_sort(array, l, length)
    if r <= length - 1:
        heap_sort(array, r, length)

    if l >= length:
        return
    index = l
    if r < length and array[r] > array[l]:
        index = r

    if array[n] < array[index]:
        array[n], array[index] = array[index], array[n]

4. 测试部分

if __name__ == '__main__':
    a = input("输入数组元素：").split(" ")
    a = list(map(int, a))
    b = a.copy()
    c = a.copy()

    # 冒泡排序
    bubble_sort(a, len(a))
    print(a)

    # 快速排序
    quick_sort(b, 0, len(b) - 1)
    print(b)

    # 堆排序
    for i in range(len(c)):
        heap_sort(c, 0, len(c) - i)
        c[0], c[len(c) - i - 1] = c[len(c) - i - 1], c[0]
    print(c)

5. 测试结果

输入数组元素：4 8 3 6 7 1 5
[1, 3, 4, 5, 6, 7, 8]
[1, 3, 4, 5, 6, 7, 8]
[1, 3, 4, 5, 6, 7, 8]

Process finished with exit code 0

本文地址：https://blog.csdn.net/zndx18/article/details/107057196