[Haskell-cafe] Re: Trees
apfelmus at quantentunnel.de
Mon Dec 3 06:22:20 EST 2007
Thomas Davie wrote:
> apfelmus wrote
>> Well, this problem doesn't make much sense in Haskell.
>> How do you specify the subtrees u and v in the first place?
> 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.
Huh? I mean, are u and v node labels of type a? Or are they subtrees? In
any case, they aren't "pointers" into the tree.
In the case of node labels, a breath first search will take
O(number of nodes of depth <= min (depth u) (depth v))
steps which is
O(size of the tree)
in the worst case.
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