commit 362f0cc711b33ba2075e439612e6909ed3b44b73 · drubery.com/aoc2025

+20 -2
src/Day3.hs
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       module Day3 where

     

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       import Data.Char

     

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       parse :: String -> [[Int]]

     

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       parse input = map (map digitToInt) (lines input)

     

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       maxJoltages :: [Int] -> [Int]

     

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       maxJoltages bank =

     

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         let update states k = zipWith max states (0 : [10*s + k | s <- states])

     

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          in foldl update (repeat 0) bank

     

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       part1 :: String -> String

     

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       part1 _ = "Day 3 part 1"

     

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       part1 input =

     

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         show $

     

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         sum $

     

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         map (\bank -> (maxJoltages bank) !! 2) $

     

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         parse input

     

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       part2 :: String -> String

     

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       part2 _ = "Day 3 part 2"

     

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       part2 input =

     

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         show $

     

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         sum $

     

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         map (\bank -> (maxJoltages bank) !! 12) $

     

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         parse input