# BST

How do i construct BST based on the following:
12, 11, 8, 16, 5, 7, 13, 9, 2

I have been thinking about this for quite some time. Inorder traversal is not suitable as it returns a list of ascending numbers. I have also tried preorder and postorder traversal....but it doesn't seem to work. Pls help.

I just need a diagram to illustrate the BST.
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Commented:
>> ok, thanks. what will the result be if it is the first one?

A BST that looks like what ozo showed. You can of course balance the tree out, but you will not be able to get the values out the same order you put them in there (unless by chance).
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Software ArchitectCommented:
Have a look to this tutorial:
http://en.wikipedia.org/wiki/Binary_search_tree
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Author Commented:
i think it shld be a preorder since postorder and inorder starts with 2. right? i have seen the tutorial.. :( not very useful pls help
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Commented:
Depending on what you mean by "based" it could be
12
11             16
8                13
5      9
2   7
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Software ArchitectCommented:
I have not clear your question.
Traversal is done AFTER tree is created. Tree internal shape will depend how you have inserted the nodes into it.
In-order traversal will always give you an ordered result.
pre-order and post-order will give you "unordered" result but exact sequence will depend on internal shape.
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Author Commented:
12, 11, 8, 16, 5, 7, 13, 9, 2 is the sequence from left to right after a traversal is done. It may be preorder, postorder or inorder traversal. Based on the sequence, how can i construct a BST?
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Commented:
You want to store the values 12, 11, 8, 16, 5, 7, 13, 9, 2 in a BST in that exact order ? Why use a BST then ? Why not just an array or a vector ?

There's no point. A BST's strength is that it makes searching of an ORDERED series a lot faster. You'd have to add a second index value that acts as key into the BST, and store the value as data. Sounds a bit overkill to me. Just take an array or vector.
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Author Commented:
no that's not what i meant. I want a diagram like what mr. ozo has given me earlier. Construct a BST based on the list of numbers The numners are to be processed from left to right.
12, 11, 8, 16, 5, 7, 13, 9, 2

Not a program. Just a diagram.
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Commented:
Yes, but there's two orders :

1) the order you put the values into the BST
2) the order you get them out of the BST

Which are you referring to when you want to get this order : 12, 11, 8, 16, 5, 7, 13, 9, 2 ?
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Author Commented:
the second one...
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Commented:
>> the second one...

Then I repeat : there's no point in using a BST - just use a simple array or vector.
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Author Commented:
ok, thanks. what will the result be if it is the first one?
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