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46 lines
1.6 KiB
Haskell
46 lines
1.6 KiB
Haskell
module Main (main) where
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import System.Environment
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import Data.Char (digitToInt)
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main :: IO ()
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main = do
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args <- getArgs
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input <- readFile $ head args
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let banks = lines input
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let values = map (getDigits 12) banks
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let numberValues = map digitsToNumber values
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print numberValues
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print $ sum numberValues
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digitsToNumber :: [Int] -> Int
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digitsToNumber [] = 0
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digitsToNumber [x] = x
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digitsToNumber (x:xs) = x * 10 ^ (length xs) + digitsToNumber xs
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--
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-- highestDigits :: (Int, Int) -> [Char] -> (Int, Int)
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-- highestDigits (d1, d2) [] = (d1, d2)
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-- highestDigits (d1, d2) [h] = let digit = digitToInt h in (d1, if digit > d2 then digit else d2)
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-- highestDigits (d1, d2) (h:t)
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-- | digitToInt h > d1 = highestDigits (digitToInt h, 0) t
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-- | digitToInt h > d2 = highestDigits (d1, digitToInt h) t
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-- | otherwise = highestDigits (d1, d2) t
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--
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getDigits :: Int -> [Char] -> [Int]
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getDigits n str = getDigitsInternal [] n $ map digitToInt str
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getDigitsInternal :: [Int] -> Int -> [Int] -> [Int]
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getDigitsInternal acc 0 _ = acc
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getDigitsInternal acc n lst = let nxt = highestDigitBeforeN (0, 0) (1, length lst - n + 1) lst in
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getDigitsInternal (acc ++ [fst nxt]) (n - 1) (drop (snd nxt) lst)
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highestDigitBeforeN :: (Int, Int) -> (Int, Int) -> [Int] -> (Int, Int)
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highestDigitBeforeN acc _ [] = acc
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highestDigitBeforeN (maxDigit, maxPos) (pos, n) (x:xs)
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| pos <= n = if x > maxDigit
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then highestDigitBeforeN (x, pos) (pos + 1, n) xs
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else highestDigitBeforeN (maxDigit, maxPos) (pos + 1, n) xs
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| otherwise = (maxDigit, maxPos)
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