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module Annans (main') where
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import qualified Data.ByteString.Lazy as BL
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import Data.List (sort)
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import Data.List.Split
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import Data.Text.Encoding (decodeUtf8)
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import Data.Text.Read (decimal)
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import Prelude
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largest3 :: [Int] -> [Int]
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largest3 = \case
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a : b : c : rest ->
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let [a', b', c'] = sort [a, b, c]
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in go a' b' c' rest
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xs -> sort xs
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where
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-- a <= b <= c
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go a b c [] = [a, b, c]
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go !a !b !c (!x : xs)
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| x >= c = go b c x xs
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| x >= b = go b x c xs
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| x >= a = go x b c xs
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| otherwise = go a b c xs
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parse :: BL.ByteString -> Int
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parse =
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(\case (Right (x, _)) -> x)
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. decimal
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. decodeUtf8
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. BL.toStrict
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parseAll :: BL.ByteString -> [[Int]]
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parseAll =
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map (map parse)
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. filter (not . null)
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. splitOn [BL.empty]
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. BL.split 0x0a
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main' :: IO ()
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main' =
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main'' "aoc_2022_day01_large_input.txt"
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process :: BL.ByteString -> [Int]
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process = largest3 . map sum . parseAll
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main'' :: FilePath -> IO ()
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main'' file = do
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[x1, x2, x3] <- process <$> BL.readFile file
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print $ x3
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print $ x1 + x2 + x3
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