Pieces of gypsum broke off. The wind wore them away to a size small enough to pick up and carry for short distances.

VOA: special.2010.01.04

Down here, I've just got two things to merge, and then I've got things of size two to merge and then things of size four to merge. But notice a trade off. I have n operations if you like down there of size one.

但是n的大小是不同的，是吗？在这里我们只要合并两个元素,然后是合并长度为2的列表,接下来是合并长度为4的列表,但是观察一下之间的权衡关系。

麻省理工公开课 - 计算机科学及编程导论课程节选