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  1. isPrefix :: Eq a => [a] -> [a] -> Bool
  2. isPrefix   []     _     =  True
  3. isPrefix   _      []    =  False
  4. isPrefix (x:xs) (y:ys)  =  x == y && isPrefix xs ys
  5.  
  6. result xs ys zs = isPrefix xs ys && isPrefix (reverse xs) (reverse zs)
  7.  
  8. main = do
  9. 	print $ result [1,2] [1,2,3] [3,1,2]
  10. 	print $ result [1,2] [1,2,3] [3,2,2]
  11. 	print $ result [1,2] [1,3,3] [3,1,2]
  12. 	print $ result [1,2] [1,2,3] [1]
  13.  
Success #stdin #stdout 0s 4544KB
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stdin
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Standard input is empty
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True
False
False
False
https://ideone.com/Hr1vF7
language:
Haskell (ghc 8.4.4)
created:
10 years ago
visibility:
public

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