目录: [C#小知识]C#中一些易混淆概念总结 [C#小知识]C#中一些易混淆概念总结(二) [C#小知识]C#中一些易混淆概念总结(三) ----------------------------------分割线-------------------------------------- 这几天在温习结构体和类的时候遇到一个问题.发现一个奇怪的现象,一直找不到合理的答案.但是今天终于找到了合理的答案,所以拿来和大家分享一下. 我们首先来看下面的一段代码: class Program { sta…

第一步:数据库->属性->选项->限制访问:SINGLE_USER 第二步:ALTER DATABASE [数据库名称] collate Chinese_PRC_CI_AI 第三步:数据库->属性->选项->限制访问:MULTI_USER   版权声明:本文为博主原创文章,未经博主允许不得转载.…

以下代码使用平台是Windows7 64bits+VS2012. sizeof是C/C++中的一个操作符(operator),其作用就是返回一个对象或者类型所占的内存字节数,使用频繁,有必须对齐有个全面的了解. 1.sizeof的基本语法 sizeof有三种语法形式,如下: (1)sizeof( object ); // sizeof( 对象 ); (2) sizeof( type_name ); // sizeof( 类型 ); (3)sizeof object; // sizeof 对象;…

Matlab是矩阵语言,如果运算可以用矩阵实现,其运算速度非常快.但若运算中涉及到大量循环,Matlab的速度令人难以忍受的.当必须使用for循环且找不到对应的矩阵运算来等效时,可以将耗时长的函数用C语言实现,并编译成Mex文件,Matlab便可以像调用内建函数一样调用C编写的函数.Mex文件其实是一种动态链接库,旧版本Matlab可以直接调用.dll,新版本要调用.mexw32或.mexw64文件. 编译过程需要C语言编译器,在Matlab中键入mex –setup进行安装与配置. MEX文件…

Mahout 是一个很强大的数据挖掘工具,是一个分布式机器学习算法的集合,包括:被称为Taste的分布式协同过滤的实现.分类.聚类等.Mahout最大的优点就是基于hadoop实现,把很多以前运行于单机上的算法,转化为了MapReduce模式,这样大大提升了算法可处理的数据量和处理性能. 一.Mahout安装.配置 1.下载并解压Mahout http://archive.apache.org/dist/mahout/ tar -zxvf mahout-distribution-0.9.tar.…

The 3n + 1 problem Time Limit: 1000MS   Memory Limit: 10000K Total Submissions: 53927   Accepted: 17142 Description Problems in Computer Science are often classified as belonging to a certain class of problems (e.g., NP, Unsolvable, Recursive). In th…

Speed Limit Time Limit: 1000MS   Memory Limit: 30000K Total Submissions: 17967   Accepted: 12596 Description Bill and Ted are taking a road trip. But the odometer in their car is broken, so they don't know how many miles they have driven. Fortunately…

A Plug for UNIX Time Limit: 1000MS Memory Limit: 65536K Total Submissions: 14786 Accepted: 4994 Description You are in charge of setting up the press room for the inaugural meeting of the United Nations Internet eXecutive (UNIX), which has an interna…

Optimal Milking Time Limit: 2000MS Memory Limit: 30000K Total Submissions: 13968 Accepted: 5044 Case Time Limit: 1000MS Description FJ has moved his K (1 <= K <= 30) milking machines out into the cow pastures among the C (1 <= C <= 200) cows.…

Shuffle'm Up Time Limit: 1000MS Memory Limit: 65536K Total Submissions: 7529 Accepted: 3466 Description A common pastime for poker players at a poker table is to shuffle stacks of chips. Shuffling chips is performed by starting with two stacks of pok…