On Mon, 02 Mar 2009 15:18:17 +0100, friggin friggin
http://hpaste.org/fastcgi/hpaste.fcgi/view?id=1989#a1990
Is the algorithm wrong ar am I using it wrong?
The second parameter of extractTree is of type Tree a, you didn't suply a line specifying what to do with the value (Leaf a), so you didn't cover all possibilities of this type; that's why you get the message "Non-exhaustive patterns in function extractTree".
Also, is the second argument to shuffle supposed to eb random numbers, ie the function should be used in the IO Monad?
If you supply a prefabricated random list of Integers, this function can be pure (i.e. not in the IO monad) -- Met vriendelijke groet, Henk-Jan van Tuyl -- http://functor.bamikanarie.com http://Van.Tuyl.eu/ --