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  1. import Control.Monad
  2.  
  3. import Data.Array
  4.  
  5.  
  6. yoba :: (Num v, Ord v) => Array (Int, Int) (Maybe v) -> Int -> Int -> Maybe v
  7. yoba rangeArr start = \end -> minimumOp [arr ! (end, x) | x <- [0 .. sizeX]]
  8.  
  9.   where bounds' @ ((0, 0), (sizeY, sizeX)) = bounds rangeArr
  10.  
  11.         arr = listArray bounds' [value y x | y <- [0 .. sizeY], x <- [0 .. sizeX]]
  12.  
  13.         value y _ | y == start = Just 0
  14.         value _ 0              = Nothing
  15.         value y x              = minimumOp [(arr ! (n, x - 1)) `addOp` (rangeArr ! (n, y)) | n <- [0 .. sizeY]]
  16.  
  17.         addOp = liftM2 (+)
  18.  
  19.         minimumOp = foldl (\x y -> (min x y) `mplus` x `mplus` y) Nothing
  20.  
  21.  
  22.  
  23.  
  24.  
  25. main = print $ yoba (toArray2D graph) start end
  26.  
  27.   where end   = 4
  28.         start = 0
  29.  
  30.         rank = 10 ^ 10000
  31.  
  32.         graph = map (map (liftM (* rank)))
  33.               $ [[Nothing, Just  7, Just  9, Nothing, Nothing, Just 14],
  34.                  [Just  7, Nothing, Just 10, Just 15, Nothing, Nothing],
  35.                  [Just  9, Just 10, Nothing, Just 11, Nothing, Just  2],
  36.                  [Nothing, Just 15, Just 11, Nothing, Just  6, Nothing],
  37.                  [Nothing, Nothing, Nothing, Just  6, Nothing, Just  9],
  38.                  [Just 14, Nothing, Just  2, Nothing, Just  9, Nothing]]
  39.  
  40.         toArray2D source = listArray ((0, 0), (size, size)) [source !! y !! x | y <- [0 .. size], x <- [0 .. size]]
  41.  
  42.           where size = length source - 1
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[1 of 1] Compiling Main             ( prog.hs, prog.o )
Linking prog ...
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https://ideone.com/DZ0eS
language:
Haskell (ghc 8.4.4)
created:
12 years ago
visibility:
public

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