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O(N2) says that the algorithm's performance is proportional to the square of the data set size. This happens when the algorithm processes each element of a set, and that processing requires another pass through the set. The infamous Bubble Sort is O(N2).
Shouldn't bubble sort be O(NN) as you might have to process the entire thing once for each element, if it was sorted backwords for example?

In reply to Re: An informal introduction to O(N) notation by BUU
in thread An informal introduction to O(N) notation by dws

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