Tree Implementation with Python List of List 代码如下: def binary_tree(val): return [val, [], []] def insert_left(root, val): root[1] = binary_tree(val) def insert_right(root, val): root[2] = binary_tree(val) def get_root_val(root): return root[0] def se…

Huffman Implementation with Python 码表 Token Frequency a 10 e 15 i 12 s 3 t 4 space 13 n 1 生成 Huffman 编码 根据上面的码表,先生成 Huffman 树,然后生成 Huffman 编码.代码如下: def binary_tree(val=None): return [val, [], []] def insert_left(root, branch): root[1] = branch def in…

We can realize a Stack as an adaptation of a Python List. S.push(e)=L.append(e) S.pop()=L.pop() S.top()=L[-1] S.len()=len(L) S.is_empty=(len(L)==0) class Empty(Exception): pass class ArrayStack: """LIFO Stack implementation using Python&quo…

目录 决策树原理 决策树代码(Spark Python) 决策树原理 详见博文:http://www.cnblogs.com/itmorn/p/7918797.html 返回目录 决策树代码(Spark Python) 代码里数据:https://pan.baidu.com/s/1jHWKG4I 密码:acq1 # -*-coding=utf-8 -*- from pyspark import SparkConf, SparkContext sc = SparkContext('local')…

作者: 负雪明烛 id: fuxuemingzhu 个人博客:http://fuxuemingzhu.cn/ 目录 题目描述 题目大意 解题方法 递归 日期 题目地址:https://leetcode.com/problems/maximum-binary-tree/description/ 题目描述 Given an integer array with no duplicates. A maximum tree building on this array is defined as fol…

# Definition for a binary tree node. # class TreeNode(object): # def __init__(self, x): # self.val = x # self.left = None # self.right = None class Solution(object): def postorderTraversal(self, root): """ :type root: TreeNode :rtype: List[…

# Definition for a binary tree node. # class TreeNode(object): # def __init__(self, x): # self.val = x # self.left = None # self.right = None class Solution(object): def inorderTraversal(self, root): """ :type root: TreeNode :rtype: List[in…

原题地址:http://oj.leetcode.com/problems/binary-tree-preorder-traversal/ 题意:这题用递归比较简单.应该考察的是使用非递归实现二叉树的先序遍历.先序遍历的遍历顺序是:根,左子树,右子树. 解题思路:如果树为下图: 1 /     \ 2         3 /     \    /    \ 4       5  6     7 使用一个栈.步骤为: 一,先遍历节点1,并入栈,如果有左孩子,继续遍历并入栈,一直到栈为{1,2,4}.…

这篇论文中提到的naive cube算法的实现,python写出来真的就和伪代码差不多=.= 输入大约长这样,依次是 index userid country state city topic category product sales 1 400141 3 78 3427 3 59 4967 4670.08 2 783984 1 34 9 1 5 982 5340.9 3 4945 1 47 1658 1 7 363 3065.37 4 468352 2 57 2410 2 37 3688…

#/usr/bin/python import os def travelTree(currentPath, count=0): if not os.path.exists(currentPath): print "no current Path" return if os.path.isfile(currentPath): fileName = os.path.basename(currentPath) print " "*count + "|_ &qu…