Ads for it make fun of how Web searches often give people a lot of useless results.

VOA: special.2009.07.17

And then remember how you solve this 'cause otherwise completely useless exercise.

记住我是怎么解决这个问题的，否则就是一次,无意义的演练了，对吧。

哈佛公开课 - 计算机科学课程节选