diff options
Diffstat (limited to '')
| -rw-r--r-- | 2023/13-Point_of_Incidence/example | 16 | ||||
| -rw-r--r-- | 2023/13-Point_of_Incidence/first.hs | 73 | ||||
| -rw-r--r-- | 2023/13-Point_of_Incidence/input | 1380 |
3 files changed, 1469 insertions, 0 deletions
diff --git a/2023/13-Point_of_Incidence/example b/2023/13-Point_of_Incidence/example new file mode 100644 index 0000000..b056c34 --- /dev/null +++ b/2023/13-Point_of_Incidence/example @@ -0,0 +1,16 @@ +#.##..##. +..#.##.#. +##......# +##......# +..#.##.#. +..##..##. +#.#.##.#. + +#...##..# +#....#..# +..##..### +#####.##. +#####.##. +..##..### +#....#..# + diff --git a/2023/13-Point_of_Incidence/first.hs b/2023/13-Point_of_Incidence/first.hs new file mode 100644 index 0000000..b7f19bc --- /dev/null +++ b/2023/13-Point_of_Incidence/first.hs @@ -0,0 +1,73 @@ +-- requires cabal install --lib megaparsec parser-combinators +module Main (main) where + +import Control.Applicative.Permutations +import Control.Monad (void, when) +import Data.Char qualified as C +import Data.Either +import Data.Functor +import Data.List qualified as L +import Data.Map qualified as M +import Data.Maybe +import Data.Set qualified as S +import Data.Vector qualified as V +import Data.Void (Void) +import Text.Megaparsec +import Text.Megaparsec.Char + +import Debug.Trace + +exampleExpectedOutput = 405 + +data Tile = Ash | Rock deriving (Eq) +instance Show Tile where + show Ash = "." + show Rock = "#" +type Row = [Tile] +type Pattern = [Row] +type Input = [Pattern] + +type Parser = Parsec Void String + +parseTile :: Parser Tile +parseTile = char '.' $> Ash + <|> char '#' $> Rock + +parseRow :: Parser Row +parseRow = some parseTile <* eol + +parsePattern :: Parser Pattern +parsePattern = some parseRow <* eol + +parseInput' :: Parser Input +parseInput' = some parsePattern <* eof + +parseInput :: String -> IO Input +parseInput filename = do + input <- readFile filename + case runParser parseInput' filename input of + Left bundle -> error $ errorBundlePretty bundle + Right input' -> return input' + +compute :: Input -> Int +compute = sum . map findMirror + where + findMirror :: Pattern -> Int + findMirror xs = 100 * findMirrors xs 1 + findMirrors (L.transpose xs) 1 + findMirrors :: Pattern -> Int -> Int + findMirrors xs i | i == length xs = 0 + | not identical = next + | otherwise = i + where + (is, ts) = L.splitAt i xs + next = findMirrors xs (i+1) + is' = reverse is -- we need to flip the left side + identical = and $ zipWith (==) is' ts + +main :: IO () +main = do + example <- parseInput "example" + let exampleOutput = compute example + when (exampleOutput /= exampleExpectedOutput) (error $ "example failed: got " ++ show exampleOutput ++ " instead of " ++ show exampleExpectedOutput) + input <- parseInput "input" + print $ compute input diff --git a/2023/13-Point_of_Incidence/input b/2023/13-Point_of_Incidence/input new file mode 100644 index 0000000..62f9d20 --- /dev/null +++ b/2023/13-Point_of_Incidence/input @@ -0,0 +1,1380 @@ +##..#..#......# +.........#..#.. +.####.#.######. +#....#.###..### +..##..#.#.##.#. +######...#..#.. +#.##.#.#.#..#.# +#....#..######. +.#..#...#.##.#. +#....#....##... +.#..#.#..####.. +......#.######. +##..##.#.####.# + +.#...##.. 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