python实现堆排序算法代码

作者: 苏菲娅50382222
来源: 51数据库
2022-08-12

#!/usr/bin/python 
import sys

def left_child(node): 
    return node * 2 + 1

def right_child(node): 
    return node * 2 + 2

def parent(node): 
    if (node % 2): 
        return (i - 1) / 2 
    else: 
        return (i - 2) / 2

def max_heapify(array, i, heap_size): 
    l = left_child(i) 
    r = right_child(i)

    largest = i 
    if l < heap_size and array[l] > array: 
        largest = l

    if r < heap_size and array[r] > array[largest]: 
        largest = r

    if largest != i: 
        array, array[largest] = array[largest], array 
        max_heapify(array, largest, heap_size)

def build_max_heap(array): 
    for i in range(len(array) / 2, -1, -1): 
        max_heapify(array, i, len(array))

def heap_sort(array): 
    build_max_heap(array) 
    for i in range(len(array) - 1, 0, -1): 
        array[0], array = array, array[0] 
    max_heapify(array, 0, i)

if __name__ == "__main__": 
    array = [0, 2, 6, 98, 34, -5, 23, 11, 89, 100, 7] 
    heap_sort(array)

    for a in array: 
        sys.stdout.write("%d " % a)

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