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【机器学习算法-python实现】决策树-Decision tree(1) 信息熵划分数据集
(转载请注明出处:http://blog.csdn.net/buptgshengod)1.背景 决策书算法是一种逼近离散数值的分类算法,思路比較简单,并且准确率较高。国际权威的学术组织,数据挖掘国际会议ICDM (the IEEE International Conference on Da...
分类:编程语言   时间:2014-06-26 22:33:33    阅读次数:410
《python源代码剖析》笔记 python中的Dict对象
本文为senlie原创,转载请保留此地址:http://blog.csdn.net/zhengsenlie1.PyDictObject对象 --> C++ STL中的map是基于RB-tree的,搜索时间复杂度是O(logN)PyDictObject採用了hash表,时间复杂度是O(1)typede...
分类:编程语言   时间:2014-06-26 16:35:13    阅读次数:175
linux实操常用命令总结
1. linux目录操作命令------目录的增、删、改、查------cd, pwd, ls, mkdir, mv, ls(du, df, tree)切换目录,跟window的使用类似cd 显示目录的详细信息ls -ld直接切换到根目录cd /在根目录下创建oracle目录mkdir /oracl...
分类:系统相关   时间:2014-06-26 16:33:22    阅读次数:301
leetcode 题解:Binary Tree Preorder Traversal (二叉树的先序遍历)
题目:Given a binary tree, return thepreordertraversal of its nodes' values.For example:Given binary tree{1,#,2,3}, 1 \ 2 / 3return[1,2,3]....
分类:其他好文   时间:2014-06-26 16:03:52    阅读次数:296
leetcode 题解:Binary Tree Inorder Traversal (二叉树的中序遍历)
题目:Given a binary tree, return theinordertraversal of its nodes' values.For example:Given binary tree{1,#,2,3}, 1 \ 2 / 3return[1,3,2].N...
分类:其他好文   时间:2014-06-26 16:02:42    阅读次数:172
【Leetcode】Search in Rotated Sorted Array
Suppose a sorted array is rotated at some pivot unknown to you beforehand. (i.e., 0 1 2 4 5 6 7 might become 4 5 6 7 0 1 2). You are given a target value to search. If found in the array retur...
分类:其他好文   时间:2014-06-26 13:58:53    阅读次数:203
【Leetcode】Search in Rotated Sorted Array II
Follow up for "Search in Rotated Sorted Array": What if duplicates are allowed? Would this affect the run-time complexity? How and why? Write a function to determine if a given target is in the...
分类:其他好文   时间:2014-06-26 07:09:01    阅读次数:213
hdu1671Phone List(字典树)
#include #include #include #include using namespace std; typedef struct Node { struct Node *next[10]; int flag; }Node,*Tree; int flag1; void Cre...
分类:其他好文   时间:2014-06-25 11:27:43    阅读次数:154
RemoveXss函数主要用于跨站脚本的过滤
//Remove the exploer'bug XSSfunction RemoveXSS($val) { $val = preg_replace('/([\x00-\x08,\x0b-\x0c,\x0e-\x19])/', '', $val); $search = 'abcdefghijklmn...
分类:其他好文   时间:2014-06-25 09:54:13    阅读次数:225
LeetCode: Sum Root to Leaf Numbers [129]
【题目】 Given a binary tree containing digits from 0-9 only, each root-to-leaf path could represent a number. An example is the root-to-leaf path 1->2->3 which represents the number 123. Find the total sum of all root-to-leaf numbers. For example, 1 ...
分类:其他好文   时间:2014-06-25 07:32:27    阅读次数:209
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