At least you maybe finding that and if not when you look back at the code you then have written you'll realize that in fact it just requires a few lines of code.

至少你会发现这一点，不然的话，在你写完代码，返回去,看的时候你会意识到,实际上它只需要几行代码。

哈佛公开课 - 计算机科学课程节选