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Can i use binary search tree in an unordered array?

Posted on 2013-01-25
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Hi there,

I have unordered array content and i want to have a search on that. So is it true that i have to sort my array first, "before" populating the tree?

Regards.
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Question by:jazzIIIlove
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7 Comments
 
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CEHJ earned 800 total points
ID: 38818306
It is true. Binary ordering/searching functionality has to be performed on sorted objects
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by:d-glitch
d-glitch earned 400 total points
ID: 38818332
No.  In a binary search, every test should reduce the search range by half.
If the array is unordered, your test doesn't tell you which way to go.
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by:AndyAinscow
AndyAinscow earned 400 total points
ID: 38818361
I agree with CEHJ - yes, you need to sort it first.
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by:d-glitch
ID: 38818371
I agree with CEHJ as well.

The No in my comment refers to the question in the title.
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by:jazzIIIlove
ID: 38818385
Thanks, but a question,
http://www.youtube.com/watch?v=a0o7AWhKKCM
 In 0.06 of the video, the elements in the array are not presorted. I am a little confused.

Regards.
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by:CEHJ
CEHJ earned 800 total points
ID: 38818447
The video i see is solely devoted to showing the ordering of the numbers
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by:Valeri
Valeri earned 400 total points
ID: 38818479
This video shows only the right way to build the binary tree, nothing more! :-)
You dont need to order the source array at the begining, but it's good to do that in order to choose the right element to put as a root of the tree. In the video root element "5" is chosen as a root "randomly" but it is very important because the rest 6 elemnts are : 3 bigger than 5 and 3 less than 5, so the tree is BALANCED by default.
If your array is not sorted at the beginning, you will be able to build the tree, but after that you need to balance it, in orer to have best performance for search operation.
see this: http://en.wikipedia.org/wiki/Self-balancing_binary_search_tree
Btw, Java offers implementatio of this structure, but yes, it's good to know how it works.
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