diff --git a/2023/day05/day05.hs b/2023/day05/day05.hs new file mode 100644 index 0000000..8a9f3f5 --- /dev/null +++ b/2023/day05/day05.hs @@ -0,0 +1,34 @@ +import Control.Arrow +import Data.Ix +import Data.List.Split + +type SeedMap = [((Int, Int), Int)] + +main :: IO () +main = do + input <- map (map words . lines) . splitOn "\n\n" <$> readFile "input" + let (seeds, maps) = parse input + print $ day5a maps seeds + +parse :: [[[String]]] -> ([Int], [SeedMap]) +parse = parseSeeds &&& map parseMap . tail + where + parseSeeds = map read . tail . head . head + +parseMap :: [[String]] -> SeedMap +parseMap = map (f . map read) . tail + where + f [x, y, z] = ((y, y + pred z), x - y) + +applyMap :: Int -> SeedMap -> Int +applyMap x m = + if null filtered + then x + else x + snd (head filtered) + where + filtered = filter ((`inRange` x) . fst) m + +day5a :: [SeedMap] -> [Int] -> Int +day5a maps = minimum . map f + where + f x = foldl applyMap x maps diff --git a/2023/day05/input 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