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data Tree a = Empty | Node a (Tree a) (Tree a) | |
deriving Show | |
type IntTree = Tree Int | |
collapse :: IntTree -> [Int] | |
collapse t = | |
case t of | |
Empty -> [-1] | |
Node a Empty r -> a : -1 : collapse r | |
Node a l Empty -> a : collapse l ++ [-1] | |
Node a l r -> a : collapse l ++ collapse r | |
main = | |
-- 1 | |
-- \ | |
-- 2 | |
-- / \ | |
-- 3 4 | |
-- \ | |
-- 5 | |
-- | |
let tree :: Tree Int = Node 1 (Empty) (Node 2 (Node 3 Empty Empty) (Node 4 Empty (Node 5 Empty Empty))) | |
in | |
print $ collapse tree | |
-- Prints: [1,-1,2,3,-1,-1,4,-1,5,-1,-1] |
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