python-哈夫曼树 

 1  #!/usr/bin/python
 2 #coding=utf-8
 3 #哈夫曼树创建
 4 
 5 class Node():
 6     def __init__(self,value,left=None,right=None):
 7         self.value=value
 8         self.left=left
 9         self.right=right
10 class Halfman():
11     def init(self,k):
12         k.sort()
13        # key=Node(k[0])
14         self.root=Node(k[0])
15         if len(k)==len(set(k)):  #无重复项判定
16             for i in range(1,len(k)):
17                 node=Node(k[i])
18                 if i==1: 
19                     max=k[i]*(len(k)-i)+self.root.value*(len(k)-1)
20                 else:
21                     max=k[i]*(len(k)-i)+self.root.value
22                 root=Node(max,self.root,node)
23                 self.root=root
24             return self.root
25     def pre(self,root):
26         if root==None:return
27         print root.value
28         self.pre(root.left)
29         self.pre(root.right)
30 
31 k=[2,8,5,6,4,7,9,1,3]
32 tree=Halfman()
33 a=tree.init([2,8,5,6,4,7,9,1,3])
34 
35 tree.pre(a)
36 
37 print '*'*40
38 
39 print a.value
40 print a.left.value
41 print a.right.value

 

posted @ 2017-07-17 16:03  橙云生  阅读(712)  评论(0)    收藏  举报