Beefy Boxes and Bandwidth Generously Provided by pair Networks
Perl: the Markov chain saw
 
PerlMonks  

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.

--
F o x t r o t U n i f o r m
Found a typo in this node? /msg me
The hell with paco, vote for Erudil!


Comment on Re: An informal introduction to O(N) notation

Log In?
Username:
Password:

What's my password?
Create A New User
Node Status?
node history
Node Type: note [id://233791]
help
Chatterbox?
and the web crawler heard nothing...

How do I use this? | Other CB clients
Other Users?
Others meditating upon the Monastery: (5)
As of 2014-09-23 23:26 GMT
Sections?
Information?
Find Nodes?
Leftovers?
    Voting Booth?

    How do you remember the number of days in each month?











    Results (241 votes), past polls