One of the things we want to help you do is identify the different classes of algorithms, what their costs are, and how you can map problems into the most efficient class to do the computation.

我们想要教会你们的事情之一就是,学会辨别不同种类的算法，它们的代价是怎么样的，以及怎么样把问题映射到,最有效的算法种类中去做计算。

麻省理工公开课 - 计算机科学及编程导论课程节选

What we really want to worry about is, as the size of the problem gets larger, how does this thing grow? How does the cost go up?

随着问题规模的变大，解决问题花费的代价是怎么增长的,因此我们将会主要地讲讲？

麻省理工公开课 - 计算机科学及编程导论课程节选