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data Tree a = Leaf a | Branch (Tree a) (Tree a)
main = print (height our_tree)
where
our_tree :: Tree Int
our_tree =
Branch (Branch (Leaf 1) (Branch (Branch (Leaf 1) (Leaf 1)) (Leaf 1)))
(Branch (Leaf 1) (Leaf 1))
height :: Tree a -> Int
height (Leaf _) = 1
height (Branch t1 t2) = 1 + max (height t1) (height t2)
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