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
