Does it really matter to you whether your code is going to take 300 years or 900 years to run?

或者900年区别大么？,这个数字的规模才是问题关键所在？

麻省理工公开课 - 计算机科学及编程导论课程节选

So if you know the answer and know what the fix is don't answer this.

如果知道答案,知道问题的关键所在，先不要说出来。

哈佛公开课 - 计算机科学课程节选