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Linux中常用命令 <一>
本笔记中记录的命令来源于 《Linux C 编程实战》 ----------------------------------------------------------------------------- 1、查看当前目录命令 pwd 2、改变当前目录 cd 3、显示目录或文件信息命令 ls ...
分类:系统相关   时间:2014-05-10 06:54:42    阅读次数:434
UVA Matrix Chain Multiplication
题目如下: Matrix Chain Multiplication Suppose you have to evaluate an expression like A*B*C*D*E where A,B,C,D and E are matrices. Since matrix multiplication is associative, the order in which m...
分类:其他好文   时间:2014-05-10 04:40:36    阅读次数:318
hust 1102 Constructing Roads
Problem DescriptionThere are N villages, which are numbered from 1 to N, and you should build some roads such that every two villages can connect to e...
分类:其他好文   时间:2014-05-10 02:28:50    阅读次数:374
【LeetCode】Best Time to Buy and Sell Stock II
Say you have an array for which theithelement is the price of a given stock on dayi.Design an algorithm to find the maximum profit. You may complete a...
分类:其他好文   时间:2014-05-10 00:24:49    阅读次数:255
Linux下SSH免密码登录(转)
搭建hadoop集群的时候一定会用到的就是SSH免密码登录[hadoop@hadoop1 ~]$ ssh-keygen -t rsaGenerating public/private rsa key pair.Enter file in which to save the key (/home/ha...
分类:系统相关   时间:2014-05-09 23:10:11    阅读次数:471
编写自己的ls命令
····要编写ls命令,首先要了解它能做什么,完成了什么工作,是如何完成这些工作的····一、ls命令能做什么? 我们在命令行输入ls,ls默认找出当前目录中所有文件的文件名,并且按照字典序排序后输出。ls命令有很多参数选项,可以决定ls的输出内容。如果参数是目录,ls列出目录的内容,如果参数是.....
分类:其他好文   时间:2014-05-09 23:04:54    阅读次数:486
java.sql.SQLException: Before start of result set
错误原因: 如API中所述 API: A table of data representing a database result set, which is usually generated by executing a statement that queries the database. A ResultSet object maintains a cursor pointi...
分类:数据库   时间:2014-05-09 21:00:43    阅读次数:423
如何获得 Windows 操作系统的版本
如何获得 Windows 操作系统的版本 很多时候我们需要知道Windows操作系统的版本,使用下面这个API函数可以做到。 Option Explicit Private Declare Function GetVersionEx Lib "kernel32" Alias "GetVersionExA" (lpVersionInformation As OSVERSIONINFO) As ...
分类:Windows程序   时间:2014-05-09 20:49:00    阅读次数:480
SXH232摄像头使用示范
It occurred to me suddenly that I wanted to program the our camera sensor for PC desktop, just like the one purchased from shop, which can make the video recording. Finally although the result seemed ...
分类:其他好文   时间:2014-05-09 14:58:02    阅读次数:373
【甘道夫】通过Mahout构建推荐系统--通过IDRescorer扩展评分规则
通过Mahout构建推荐系统时,如果我们需要加入某些过滤规则(比如:item的创建时间在一年以内),则需要用到IDRescorer接口,该接口源码如下: package org.apache.mahout.cf.taste.recommender; /**  *   * A {@link Rescorer} which operates on {@code long...
分类:其他好文   时间:2014-05-09 14:09:08    阅读次数:369
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