计算机科学导论

Unit 1: How to get started: your first program

Our biggest goal tho is to learn about computer science. Computer science is about how to solve problems.  计算机科学是关于如何解决问题的科学。

Like building a search engine, by breaking them into smaller pieces. And then precisely and mechanically describing a sequence of steps that you can use to solve each piece. And those steps can be executed by computer. 

What the most important thing is in building an search engine?

1-3单元 Web Crawler

歧义性 Ambiguity “Natural language are inherently ambiguous.Different people can interpret..”

Grammer 巴克斯构造

光速计算

查找子字符串

如果寻找的字符串不存在，find将会显示”-1“

使用数字线查找