#!/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[i]: largest = l if r < heap_size and array[r] > array[largest]: largest = r if largest != i: array[i], array[largest] = array[largest], array[i] 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[i] = array[i], 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)