竹影林风-优快云博客

原创关于迅速上手Pychart的简单介绍

博主在项目中使用python画图时，初碰Pychart，网上关于Pychart的使用说明较少，因此，碰到了几个新手容易出现的问题，现在把经验分享一下，好让这样的Pychart的菜鸟少走些弯路。步骤一：安装Pychart官方下载地址：http://home.gna.org/pychart/1.解压文件到你工作目录下，例如/Users/lmm/Documents/baidu/python

2016-03-29 11:34:55 4368

原创 php在foreach中使用引用赋值&可能遇到的问题

楼主在写项目的时候，由于初涉PHP的赋值引用操作，觉得这个功能非常强大，用时一时爽，没有深入了解过其中的原理，导致了一些当时觉得不可思议的BUG，废话不都说，我举个例子详细的描述一下这个问题。代码：$test=array('a','b','c');foreach($test as &$value){ echo $value;}echo $value;foreach($

2015-12-28 19:53:02 5512 1

原创 leetcode Implement strStr()

题目：mplement strStr().Returns the index of the first occurrence of needle in haystack, or -1 if needle is not part of haystack.方法一：解题思路：普通的算法思路很简单，直接两个指针遍历就ok了，但是效率一般，比较出名的是KMP算法。代码

2015-03-14 14:18:30 431

原创 leetcode Remove Element

题目：Given an array and a value, remove all instances of that value in place and return the new length.The order of elements can be changed. It doesn't matter what you leave beyond the new len

2015-03-13 14:48:47 400

原创 leetcode Remove Duplicates from Sorted Array

题目：Given a sorted array, remove the duplicates in place such that each element appear only once and return the new length.Do not allocate extra space for another array, you must do this in p

2015-03-13 14:25:12 438

原创 leetcode Reverse Nodes in k-Group

题目：Given a linked list, reverse the nodes of a linked list k at a time and return its modified list.If the number of nodes is not a multiple of k then left-out nodes in the end should remain

2015-03-12 16:38:31 469

原创 leetcode Swap Nodes in Pairs

题目：Given a linked list, swap every two adjacent nodes and return its head.For example,Given 1->2->3->4, you should return the list as 2->1->4->3.Your algorithm should use only constant

2015-03-12 14:37:49 378

原创 leetcode Merge k Sorted Lists

题目：Merge k sorted linked lists and return it as one sorted list. Analyze and describe its complexity.解题思路：利用一个优先队列实现程序的模拟，优先队列根据ListNode的val值大小进行排序。代码：public ListNode mergeKLists(Array

2015-03-12 13:04:14 377

原创 leetcode Generate Parentheses

题目：Given n pairs of parentheses, write a function to generate all combinations of well-formed parentheses.For example, given n = 3, a solution set is:"((()))", "(()())", "(())()", "()(()

2015-03-10 19:45:03 367

原创 leetcode Valid Parentheses

题目：Given a string containing just the characters '(', ')', '{', '}', '[' and ']', determine if the input string is valid.The brackets must close in the correct order, "()" and "()[]{}" are

2015-03-10 17:11:45 420

原创 leetcode Remove Nth Node From End of List

题目：Given a linked list, remove the nth node from the end of list and return its head.For example, Given linked list: 1->2->3->4->5, and n = 2. After removing the second node from the

2015-03-10 14:44:04 472

原创 leetcode 4Sum

题目：Given an array S of n integers, are there elements a, b, c, and d in S such that a + b + c + d = target? Find all unique quadruplets in the array which gives the sum of target.Note:

2015-03-09 21:01:09 364

原创 leetcode Letter Combinations of a Phone Number

题目：Given a digit string, return all possible letter combinations that the number could represent.A mapping of digit to letters (just like on the telephone buttons) is given below.Input

2015-03-09 11:19:29 525

原创 leetcode 3Sum Closest

题目：Given an array S of n integers, find three integers in S such that the sum is closest to a given number, target. Return the sum of the three integers. You may assume that each input would hav

2015-03-09 09:59:16 376

原创 leetcode 3Sum

题目：Given an array S of n integers, are there elements a, b, c in S such that a + b + c = 0? Find all unique triplets in the array which gives the sum of zero.Note:Elements in a tripl

2015-03-08 19:35:20 491

原创 leetcode Longest Common Prefix

题目：Write a function to find the longest common prefix string amongst an array of strings.解题思路：最长的公共字符串肯定不会超过第一个字符串的长度，所以以第一个为比较的基础，每次比较时，length都会逐步缩短。代码： public String longestCommonPrefi

2015-03-08 15:16:51 363

原创 leetcode Roman to Integer

题目：Given a roman numeral, convert it to an integer.Input is guaranteed to be within the range from 1 to 3999.基本字符IVXLCDM相应的阿拉伯

2015-03-08 14:03:57 554

原创 leetcode Integer to Roman

题目：Given an integer, convert it to a roman numeral.Input is guaranteed to be within the range from 1 to 3999.基本字符IVXLCDM相应的阿拉伯数字

2015-03-08 13:35:10 378

原创 leetcode Container With Most Water

题目：Given n non-negative integers a1, a2, ..., an, where each represents a point at coordinate (i, ai). n vertical lines are drawn such that the two endpoints of line i is at (i, ai) and (i,

2015-03-07 18:50:35 403

原创 leetcode Regular Expression Matching

题目：Implement regular expression matching with support for '.' and '*'.'.' Matches any single character.'*' Matches zero or more of the preceding element.The matching should cover the entire

2015-03-07 16:48:20 395

原创 leetcode Palindrome Number

题目：Determine whether an integer is a palindrome. Do this without extra space.解题思路：负数不是回文数字，想办法在不增加额外空间的情况下将数字反转。代码：public boolean isPalindrome(int x) { int copy = x; int

2015-03-07 14:07:24 340

原创 leetcode String to Integer (atoi)

题目：Implement atoi to convert a string to an integer.Hint: Carefully consider all possible input cases. If you want a challenge, please do not see below and ask yourself what are the possible

2015-03-07 13:19:19 360

原创 leetcode Reverse Integer

题目：Reverse digits of an integer.Example1: x = 123, return 321Example2: x = -123, return -321解题思路：这里需要注意几个问题，一是x尾数为0的情况，二是x反过来的时候溢出的情况。代码：public int reverse(int x) { long su

2015-03-05 16:08:29 402

原创 leetcode ZigZag Conversion

题目：The string "PAYPALISHIRING" is written in a zigzag pattern on a given number of rows like this: (you may want to display this pattern in a fixed font for better legibility)P A H NA

2015-03-05 14:27:59 362

原创 leetcode Longest Palindromic Substring

题目：Given a string S, find the longest palindromic（回文） substring in S. You may assume that the maximum length of S is 1000, and there exists one unique longest palindromic substring.方法一：解题思

2015-03-04 20:46:45 402

原创 leetcode Median of Two Sorted Arrays

题目：There are two sorted arrays A and B of size m and n respectively. Find the median of the two sorted arrays. The overall run time complexity should be O(log (m+n)).解题思路：该方法的核心是将原问题转变成一个寻找第

2015-03-04 17:34:01 508

原创 leetcode Longest Substring Without Repeating Characters

题目：Given a string, find the length of the longest substring without repeating characters. For example, the longest substring without repeating letters for "abcabcbb" is "abc", which the length is

2015-03-04 17:31:00 394

原创 leetcode Add Two Numbers

题目：You are given two linked lists representing two non-negative numbers. The digits are stored in reverse order and each of their nodes contain a single digit. Add the two numbers and return it as

2015-03-04 17:23:23 374

原创 leetcode TwoSum

题目如下：Given an array of integers, find two numbers such that they add up to a specific target number.The function twoSum should return indices of the two numbers such that they add up to the ta

2015-03-04 17:18:46 524

原创 cookie和session的区别

参考百度知道！具体来说cookie机制采用的是在客户端保持状态的方案，而session机制采用的是在服务器端保持状态的方案。同时我们也看到，由于采用服务器端保持状态的方案在客户端也需要保存一个标识，所以session机制可能需要借助于cookie机制来达到保存标识的目的，但实际上它还有其他选择。 cookie机制。正统的cookie分发是通过扩展HTTP协议来实现的，服务器

2013-11-02 21:52:15 429

原创 java编写的简陋的三子棋游戏

LZ最近在准备保研，因为去年上机题是三子棋问题，所以无聊时写了一下，程序实现了基本的功能，但是比较简陋。下面贴出代码，读者可以借鉴，自行修改！package cn.edu.nju.software;import java.awt.GridLayout;import java.awt.event.ActionEvent;import java.awt.event.ActionListener

2013-09-09 20:10:02 5201

原创求解最大子序列和

从一串数据中算出最大的子序列和，这里提供了三种方法，方案一到方案三中算法由劣到优。例如：-2,11，-4,13，-5，-2，答案为20（从A2到A4）方案一：public static int maxSubSum(int a []){ int maxSum=0; for(int i=0; i for(int j=i; j

2013-04-09 21:16:27 536

首先需要说明的是，LZ只是说明一下最简单的创建一个普通列表的方式。关于GTK的GtkTreeView的使用非常复杂，它不像QT，直接可以拖一个表格就可以了，所以，提供过于灵活的使用方式带来的负面影响就是不容易掌控。LZ因为在写一个售票的系统，所以在显示车次、车票等信息时，必然会用到列表显示数据，建一个最普通的列表耗费了LZ好长时间的学习代价。如果读者也只是简单的想创建一个列表的话，不妨可以借鉴一下

2013-03-13 14:59:22 2044 1

原创 GTK+3.0加Glade3 编程时可能遇到的问题详解

LZ在写作业时，自己切身遇到的问题以及最终经过研究得出的解决方案。所做实验的代码test.c如下：#include void on_mainLoginWindow_destroy(){}int main(int argc, char *argv[]) { GtkBuilder *builder; GtkWidget *window; g

2013-03-03 15:11:53 2671 1

原创 Ubuntu下安装、配置MySQL与使用实践

安装MySQL1：安装MySQLLZ采用的是懒人方法，避免了自己配置的麻烦。如果读者想自己安装然后在改配置的话，可以参考下面的文章：http://blog.youkuaiyun.com/xianqiang1/article/details/8121446http://www.haogongju.net/art/1489854方法一：打开Ubuntu软件中心，搜索栏中搜索mysql，

2013-02-28 11:05:12 384

原创 Ubuntu上安装eclipse与jdk的配置

LZ近期写了一个模拟火车订票系统的程序，开发语言使用的是C。由于Linux自带的文本编辑器写代码很是蛋疼，所以IDE选择了Eclipse，下面就是Eclipse的下载安装与jdk的详细配置过程。1：下载Eclipse与JDKEclipse下载地址：Eclipse IDE for C/C++ Developers JDK下载地址：JAVA SE Development K

2013-02-27 20:13:53 380

原创 gcc编译c语言(访问数据库mysql)时可能遇到的问题

问题1：错误：mysql.h:没有那个文件或目录解决方案1：如果你的头文件是#include 改为#include试试解决方案1：楼主可能没有安装开发包，采用如下命令安装开发包： sudo apt-get install libmysqlclient-dev问题2：错误： In function 'login':ticketSystem

2013-02-22 16:10:03 741

扫雷（HTML+JS+CSS）

windows下galde3-3.6.7安装程序

空空如也