Write Test Case for ACM

When resolving a ACM problem, it's not a good idea to simply write a compilable algorithm and submit to the ACM system in the hope of getting AC (accept). This way, we re relying on the system to provide some secret test cases to validate the

Product quality issue

Having invested so much time on the web server, it still seems to be buggy. Based on feedback from qa team, the number of bugs is keeping on climbing. So, what's the problem with it?1. The requirement isn't clear enoughWe've got an design document

Minimize Code Explosion of Generic Type

Generic is added to .net framework since version 2, which highly increase the re-usability of commonly used algorithms. It's well known that jit compiler will generate concrete type with given generic type argument at run time. So, it's possible

openoffice exports better pdf than word

I generated a pdf file from a word document with word 2007. But the pdf file looks very uncomfortable in my pdf viewer. So I looked it closely to see what makes me feel so. The culprit is the spacing between characters. As shown in the image blow,

describe intention directly before ask a question

Before asking a question, it's a good habit to describe your intention clearly. Below is a real story happened between me and a coworker.  CW: hey, do you know how to do B on windows?  ME: o, yes. You can:       1. Blah blah      2. Blah blah      3.

一個人的路,很累!

   

SQLSERVER中的網路設定

關於sqlserver中的網路設定,以前也用sqlserver2005做過東西,有時串連出錯時,不是baidu就是google,對於這些常見的東西,一點都不明白是什麼意思,慚愧啊,今天看了本書,寫的不錯,跟大家分享下.SQLSERVER的網路通訊協定有四個,分別是Shared Memory,Named Pipes,TCP/IP,VIA.在安裝SQLserver時,預設的一般是Shared Memory已經啟用了,但這四個協議到底有什麼用呢,讓我們來看一下.(1)Shared

大家一年花多少錢來買技術方面的書?

我一直喜歡買技術方面的書,大部分都是國外被翻譯過來的,特別是XX出版社的,宿舍的人都說我你是不是特有錢啊,我都不知道怎麼回答?總感覺看電子書不爽,其實有的書我並沒有從頭到尾都仔細的看了,但是大概總是看過一遍的,遇到問題,知道在書上什麼地方,大家一年都花多少錢在購買技術書籍上,做個調查,希望大家配合一下,聲明一下,沒有什麼目的,就是好奇。回答的格式如下:x元/年,月收入:y元,當然如果你不想透露你的工資資訊,可以不寫,呵呵!

Override CheckMediaType with care

A problem I encountered while developing my source filter's output pin is that inside FillBuffer method, the media type and size of the media sample is not exactly the same as the one I proposed in GetMediaType method. The strange thing is my pin

.NET中的程式集

現在是虛擬機器時代了,Java稱作JVM(JAVA 虛擬機器),.NET稱作 FrameWork(架構)。對照著兩個體系,當中有很多異同,不過我感興趣的是.NET中稱作“AppDomain”(應用程式定義域)的東東。這個概念如何準確的理解,對於.NET開發來講有何意義?使用它需要注意些什嗎? 微軟的.NET文檔中appDomain的解釋相當簡略(卻不是很清楚J): “一個應用程式在其中執行的獨立環境”。為執行Managed

Use google.com instead of google.com.hk

After google moved their service from china mainland to hongkong, I can't access google.com or google.cn from mainland anymore. I always get redirected to google.com.hk. Based off my experience with google.com.hk, it shows more noise information

用過 VS 的朋友, VSHOST.exe 是什嗎?

當你看到這個題目時,你也許會對VS有一個重新的認識,這是MSDN上的一篇原文,雖然我的英語很爛,但感覺還能看懂,各位大俠看起來肯定比我要理解的深的多。VSHOST -- the Hosting Process If you have been using the new Visual Studio 2005 beta you have noticed a few new files showing up in the "bin" folder with the word "vshost" in

Ex5.1-2 of introduction to algorithms

A friend asked my idea about the exercise 5.1-2 of introduction to algorithms. Here is the original question:Question:Describe an implementation of the procedure RANDOM(a, b) that only makes calls to RANDOM(0, 1). What is the expected running time

avoid memory leak in osip

I was debugging memory leak bugs recently. The bug was caused by incorrect usage of the osip library. It's not uncommon that we meet problems when we rely on a library or framework that we don't fully understand. Symptom and debuggingThe symptom is

why I prefer wireshark to network monitor

Personally, I prefer wireshark to network monitor for:Wireshark runs on many platforms including windows, linux, mac os x, etc. I need to work both on linux and windows, and I'd like to keep my toolbox as compact as possible. Wireshark uses a widely

公開金鑰的加密

   對於加密,必須區分對稱式加密和公開金鑰/私密金鑰加密。   在對稱式加密時,可以使用同一個密鑰進行加密和解密。但公開金鑰/私密金鑰不是這樣的。如果使用一個公開金鑰進行加密,就應使用相應的私密金鑰進行解密,而不是公開金鑰進行解密。同樣,如果使用一個私密金鑰進行加密,就應使用對應的公開金鑰進行解密,而是不私密金鑰進行解密。   公開金鑰/私密金鑰總是成對的建立的。公開金鑰可以由任何人使用,但私密金鑰必須安全的加鎖。  

draw uml with latex&metauml

I've used and enjoyed the benefits of reversion control system for several years. RCS makes my life a lot easier. And it pushes me to highly prefer text format files over binary files, because text files can be managed by RCS more easily. metauml

AssemblyInfo.cs檔案的作用

C# AssemblyInfo.cs主要用來設定產生的有關程式集的常規資訊dll檔案的一些參數請看以下具體說明://標題:  [assembly:AssemblyTitle("PP126.net")]//備忘: 

GoAhead Web Server Hang

Symptom:Recently, we are experiencing process hang with the goAhead web server. The symptom can be reproduced if we disconnect the network cable while the browser is loading a page. When it occurs, we can see that the process doesn't occupy any cpu

why can we use printf without including stdio.h

I read the c programming language again to mourn Dennis Ritchie who passed away recently. I noticed below statements in section "4.2 Functions Returning Non-integers", which explains the question, why can we use printf without including stdio.h.The

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