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Re: An informal introduction to O(N) notation

by FoxtrotUniform (Prior)
on Feb 08, 2003 at 23:26 UTC ( #233791=note: print w/replies, xml ) Need Help??


in reply to An informal introduction to O(N) notation

    The infamous Bubble Sort is O(N2).

So is quicksort, in the worst case. :-) Mergesort and heapsort are both O(N log N) in the worst case.

Most of the time, there's no difference in asymptotic order between the average- and worst-case inputs, but every once in a while, something (like quicksort) comes along and bites you on the ass on certain inputs. Quicksort expects its input to be mostly random; ordered input will mess it up. (Think about building a binary tree from ordered input: you'll get a linear list, which is O(N) nodes deep, not a nice bushy tree, which would be O(log N) nodes deep.) Something to think about when building divide and conquer algorithms.

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[hippo]: Why not?
[1nickt]: That's good! I suppose the cpanfile would be the same however the app distro is structured ...
[1nickt]: hippo no reason why not other than wanting to check an assumption :-)
[hippo]: For a self-contained application which can therefore ensure thread safety it seems like a sensible approach.
[choroba]: No, if there are no threads, then the user wants to use MCE. If there are threads, the user can choose.
[1nickt]: choroba Understood. I'm wondering about the logic in a cpanfile. If the perl doesn't support threads, it's easy: require MCE. If the perl does support threads, as you say the user has a choice, so require both? Or, assume that irrespective of the choide

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