For each element we need to identify the best source for it.
对于每个元素,我们需要确定它的最佳来源。
Consider the hierarchy for each element.
考虑每个元素的层次结构。
For each element, you can describe the availability in two ways.
对每一个元素,您可以用两种方式描述其可用性。
That one's not so obvious. So let's think about this for a second. To sort a list in linear time, would say, I have to look at each element in the list at most a constant number of times.
所以让我们来思考一会,要在线性时间能排序,列表里每个元素最多被使用常数次,不一定是一次,对吧。
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