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  1. import Data.Word
  2. import Data.Array.Unboxed
  3.  
  4. crack :: Int -> [Word64]
  5. crack n = helper n 0 0
  6.   where helper 0 _ acc
  7.           | acc == f acc = [acc]
  8.           | otherwise    = []
  9.         helper k n acc = concat [ helper (k-1) c (acc + ps!c) | c <- [n..9]]
  10.         ps = listArray (0,9) (map (^13) [0..9]) :: UArray Int Word64
  11.         f 0 = 0
  12.         f a = (ps ! fromIntegral (a`mod`10)) + f (a`div`10)
  13.  
  14. main = mapM_ print (crack 15)
Success #stdin #stdout 2.13s 6244KB
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https://ideone.com/bvC34p
language:
Haskell (ghc 8.4.4)
created:
12 years ago
visibility:
secret

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