# Copyright 2015 Egor Tensin # This file is licensed under the terms of the MIT License. # See LICENSE.txt for details. # Disclaimer: implemented in the most literate way. def heapsort(xs): heapify(xs) first, last = 0, len(xs) - 1 for end in range(last, first, -1): xs[end], xs[first] = xs[first], xs[end] siftdown(xs, first, end - 1) return xs # In a heap stored in a zero-based array, # left_child = node * 2 + 1 # right_child = node * 2 + 2 # parent = (node - 1) // 2 def _get_parent(node): return (node - 1) // 2 def _get_left_child(node): return node * 2 + 1 def _get_right_child(node): return node * 2 + 2 def heapify(xs): last = len(xs) - 1 first_parent, last_parent = 0, _get_parent(last) for parent in range(last_parent, first_parent - 1, -1): siftdown(xs, parent, last) def siftdown(xs, start, end): root = start while True: # We swap if there is at least one child child = _get_left_child(root) if child > end: break # If there are two children, select the minimum right_child = _get_right_child(root) if right_child <= end and xs[child] < xs[right_child]: child = right_child if xs[root] < xs[child]: xs[root], xs[child] = xs[child], xs[root] root = child else: break if __name__ == '__main__': import sys print(heapsort(list(map(int, sys.argv[1:]))))