本笔记中记录的命令来源于 《Linux C 编程实战》
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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
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...
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其他好文 时间:
2014-05-10 04:40:36
阅读次数:
318
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...
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其他好文 时间:
2014-05-10 02:28:50
阅读次数:
374
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...
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其他好文 时间:
2014-05-10 00:24:49
阅读次数:
255
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
····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.....
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其他好文 时间:
2014-05-09 23:04:54
阅读次数:
486
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
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 ...
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
...
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其他好文 时间:
2014-05-09 14:58:02
阅读次数:
373
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...
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其他好文 时间:
2014-05-09 14:09:08
阅读次数:
369