[Haskell-cafe] Re: inserting values in a binary tree

PR Stanley wrote:

Actually, you've touched an important point there. It's balancing that I'm having difficulty with. Paul

http://en.wikipedia.org/wiki/Tree_rotation is the key to all this: It changes the tree structure without changing the tree ordering. rotr (Node (Node a p b) q c) = Node a p $ Node b q c untested, mind you.

At 23:46 09/05/2008, you wrote:

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PR Stanley wrote:

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Hi data Ord a => Tree a = Nil | Node (Tree a) a (Tree a) How would one go about inserting a value in a binary search tree of the above description?

Using a library ;)

Inserting isn't the problem, balancing is where things get interesting: have a look at

http://en.wikipedia.org/wiki/AVL_tree

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