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  1. data Tree a = Val a | Tarai (Tree a) (Tree a) (Tree a) deriving Show
  2.  
  3. tri a b c = Tarai (Val a) (Val b) (Val c)
  4.  
  5. tri_next (Val a) = Val a
  6. tri_next (Tarai (Val a) (Val b) (Val c)) | a <= b = (Val b)
  7. tri_next (Tarai (Val a) (Val b) (Val c)) = Tarai (tri (a-1) b c) (tri (b-1) c a) (tri (c-1) a b)
  8. tri_next (Tarai (Val a) (Val b) c) = Tarai (Val a) (Val b) (tri_next c)
  9. tri_next (Tarai (Val a) b c) = Tarai (Val a) (tri_next b) c
  10. tri_next (Tarai a b c) = Tarai (tri_next a) b c
  11.  
  12. tri_loop (Val a) = do
  13. 	print (Val a)
  14.  
  15. tri_loop (Tarai a b c) = do
  16. 	print (Tarai a b c)
  17. 	tri_loop (tri_next (Tarai a b c))
  18.  
  19. main = do
  20. 	tri_loop (tri 2 1 0)
  21.  
  22.  
Success #stdin #stdout 0s 4656KB
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Standard input is empty
stdout
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Tarai (Val 2) (Val 1) (Val 0)
Tarai (Tarai (Val 1) (Val 1) (Val 0)) (Tarai (Val 0) (Val 0) (Val 2)) (Tarai (Val (-1)) (Val 2) (Val 1))
Tarai (Val 1) (Tarai (Val 0) (Val 0) (Val 2)) (Tarai (Val (-1)) (Val 2) (Val 1))
Tarai (Val 1) (Val 0) (Tarai (Val (-1)) (Val 2) (Val 1))
Tarai (Val 1) (Val 0) (Val 2)
Tarai (Tarai (Val 0) (Val 0) (Val 2)) (Tarai (Val (-1)) (Val 2) (Val 1)) (Tarai (Val 1) (Val 1) (Val 0))
Tarai (Val 0) (Tarai (Val (-1)) (Val 2) (Val 1)) (Tarai (Val 1) (Val 1) (Val 0))
Tarai (Val 0) (Val 2) (Tarai (Val 1) (Val 1) (Val 0))
Tarai (Val 0) (Val 2) (Val 1)
Val 2
https://ideone.com/63bZSE
language:
Haskell (ghc 8.4.4)
created:
8 years ago
visibility:
public

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