Zirui Wang's blog 王子睿的博客

原创 uHunt

sudo npm --registry https://registry.npm.taobao.org install -g uva-nodehttps://www.npmjs.com/package/uva-nodehttps://github.com/felix-halim/uhunt-componentshttps://cdnjs.cloudflare.com/ajax/libs/jquery/1.11.2/jquery.min.js

原创 On the Number of Primes Less Than a Given Magnitude (by Bernhard Riemann)

I believe I can best express my gratitude for the honor which the Academy has bestowed on me in naming me as one of its correspondents by immediately availing myself of the privilege this entails to c...

原创 A problem in an exam

Yesterday I took part in Peking University’s Masters Entrance Exam. It’s really inspiring! Here is a problem that I understand, have tried true, but don’t know how to solve.∑k=0m(−1)k(mk)1k+n+1=∑k=0n...

原创 I want to make a website

What should it be? It should make money. Books. Let's focus on books. PDFs are perfect. How do you deal with copyright? Make a search engine for PDF.

原创 Problems by Topic @ acm.pku.edu.cn

DFS ＋ Memoisation : 1088Big integer : 1519

原创 Use of Legacy Source Code

Source code is a valuable resource, especially for those who do not know themselves. 

原创 Programming Methodology?

Stroustrup: "Good design and the absence of errors cannot be guaranteed merely by the presence or the absence of specific language features." http://www.pbm.com/~lindahl/real.programmers.html

原创 [GCC] 4.1.1 is different

G++ 4.1.1 is a lot more stricter, and makes more sense. My old sloppy code no longer compiles, and thank goodness -- they made me believe that C++ is hopeless. 

原创 [C++] Use Endl Judiciously

Do you know that the statement cout is about 4 times as slow as cout , because endl performs an fflush(stdout)?

原创 What Exactly Is the Error?

In C++, the statement cout is about 4 times as slow as cout , because endl performs an fflush(stdout).Test after coding. Read, understand, design, code, test--for a small unit, the process goes like

原创 Divide & Conquer 分治策略

interface and implementationanalysis and design

原创 Do You Use Maple?

If you use Maple, then you should certainly try Pascal. They are from the same family, so one language is not difficult to learn once the other is familiar to you. Experience the speed of Pascal (or t

原创 Software but a Bubble

"Is it possible that software is not like anything else, that it is meant to be discarded: that the whole point is to always see it as a soap bubble? -- Alan J. Perlis, as quoted in Structure and Inte

原创 I think I've found the best font type for programming.

原创 Diagram-Drawing in Design

Its all about visualisation. See this.But I am against formal pictures: Drawing should just emphasize the key elements.

原创 Top-Down!!!

自顶向下 逐步求精“本书不仅全面介绍了标准 PASCAL 语言,而且通过介绍 PASCAL 语言讲述了自顶向下逐步求精的结构化程序设计的基本思想和基本方法。学习程序设计必须理论联系实际,本书在介绍基本概念的同时,列举了大量典型而有意义的例题和习题。”－－郑启华《PASCAL 程序设计》    http://www.china-pub.com/computers/common/info.asp?id

原创 Durability should be a key consideration in designing a storage medium.

I am thinking of paper.IBM notebook. Data protection. Recovery.Security is not. "Information wants to free," as they say.