30 lignes
746 B
Haskell
30 lignes
746 B
Haskell
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import Data.Map (Map, (!))
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import qualified Data.Map as Map
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loeb :: Functor f => f (f a -> a) -> f a
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loeb x = go where go = fmap ($ go) x
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loebify :: Integer -> Integer -> (Map (Integer, Integer) Integer -> Integer)
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loebify n k
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| k == 1 || k == 0 || n == 1 = const k
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| otherwise = (\m -> 1 + (minimum $ map (\i -> f m i) [1..k]))
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where
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f m i = max (m ! ((n-1),(i-1))) (m ! (n,(k-i)))
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solve :: Integer -> Integer -> Integer
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solve n k = (loeb m) ! (n,k)
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where
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f (n,k) = ((n,k), loebify n k)
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m = Map.fromList $ map f [ (x,y) | x <- [1..n], y <- [0..k]]
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-----------------
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-- gross io bs --
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-----------------
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main :: IO ()
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main = do
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l <- getLine
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let (n:k:_) = map read $ words l :: [Integer]
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putStrLn $ show $ solve n k
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