[Haskell-cafe] Re: Trees

[Thomas Davie]

One could alway store a node's depth at each node -- then you must  
search for u and v, creating a list of what nodes you found at each  
depth, and finally, simply compare the lists -- O(n) in the depth of u  
and v.

Bob

On 3 Dec 2007, at 08:40, apfelmus wrote:

> Adrian Neumann wrote:
>> > data Tree a = Leaf a | Node a [Tree a]
>> But now the assignments require more than a simple top-down  
>> traversal. For example: given a tree t and two nodes u,v, find the  
>> first common ancestor.
>
> Well, this problem doesn't make much sense in Haskell. How do you  
> specify the subtrees u and v in the first place?
>
>
> Regards,
> apfelmus
>
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