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  1. main = do	-- your code goes here
  2. 	print $isFlat [Node 1, Node 2, Node 3]
  3. 	print $isFlat [Node 1, Node 2, Branch [Node 3, Node 4, Node 5], Node 6]
  4.  
  5. data Tree a = Node a | Branch [Tree a]
  6.  
  7. isFlat :: [Tree a] -> Bool
  8. isFlat = all isNode where
  9. 						isNode (Node _) = True
  10. 						isNode _ = False
Success #stdin #stdout 0s 6260KB
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stdin
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Standard input is empty
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True
False
https://ideone.com/sPhRCP
language:
Haskell (ghc 8.4.4)
created:
10 years ago
visibility:
public

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