2024-20 part 1 in haskell

This commit is contained in:
Julien Dessaux 2025-06-15 00:37:36 +02:00
parent cc7e97348b
commit cfde33a57b
Signed by: adyxax
GPG key ID: F92E51B86E07177E
3 changed files with 238 additions and 0 deletions

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-- requires cabal install --lib megaparsec parser-combinators heap vector
module Main (main) where
import Control.Monad (void, when)
import Data.Functor
import qualified Data.List as L
import qualified Data.Map as M
import Data.Maybe
import qualified Data.Vector as V
import Data.Void (Void)
import Text.Megaparsec
import Text.Megaparsec.Char
import Debug.Trace
exampleExpectedOutput = 5
data Tile = Wall | Floor | Start | End deriving (Eq, Show)
type Line = V.Vector Tile
type Input = V.Vector Line
type Parser = Parsec Void String
parseTile :: Parser Tile
parseTile = char '#' $> Wall
<|> char '.' $> Floor
<|> char 'E' $> End
<|> char 'S' $> Start
parseLine :: Parser Line
parseLine = do
line <- some parseTile <* eol
return $ V.generate (length line) (line !!)
parseInput' :: Parser Input
parseInput' = do
line <- some parseLine <* eof
return $ V.generate (length line) (line !!)
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'
type Coord = (Int, Int)
type Visited = M.Map Coord Int
type Cost = Int
compute :: Input -> Int -> Int
compute input minGains = trace (show findAllShortcutCosts) $ length $ filter (>= minGains) findAllShortcutCosts
where
findAllShortcutCosts :: [Int]
findAllShortcutCosts = M.foldrWithKey findShortcutCostsFrom [] costs
findShortcutCostsFrom :: Coord -> Int -> [Int] -> [Int]
findShortcutCostsFrom (x, y) c acc = acc ++ catMaybes [ if and [input V.! y V.! (x+1) == Wall, M.member (x+2, y) costs] then Just (costs M.! (x+2, y) - c - 2) else Nothing
, if and [input V.! y V.! (x-1) == Wall, M.member (x-2, y) costs] then Just (costs M.! (x-2, y) - c - 2) else Nothing
, if and [input V.! (y+1) V.! x == Wall, M.member (x, y+2) costs] then Just (costs M.! (x, y+2) - c - 2) else Nothing
, if and [input V.! (y-1) V.! x == Wall, M.member (x, y-2) costs] then Just (costs M.! (x, y-2) - c - 2) else Nothing]
(costs, len) = walk M.empty 0 (sx, sy)
where
walk :: Visited -> Int -> Coord -> (Visited, Int)
walk m c (x, y) | t == End = (m', c)
| otherwise = walk m' (c+1) next
where
[next] = filter (\p@(i, j) -> and [input V.! j V.! i /= Wall, not $ M.member p m']) candidates
candidates = [(x-1, y), (x+1, y), (x, y-1), (x, y+1)]
m' = M.insert (x, y) c m
t = input V.! y V.! x
height = V.length input
width = V.length (input V.! 0)
sx = fst $ (V.filter (\(_, t) -> t == Start) $ V.indexed $ input V.! sy) V.! 0
sy = fst $ (V.filter (\(_, v) -> V.length (V.filter (== Start) v) == 1) $ V.indexed input) V.! 0
main :: IO ()
main = do
example <- parseInput "example"
let exampleOutput = compute example 20
when (exampleOutput /= exampleExpectedOutput) (error $ "example failed: got " ++ show exampleOutput ++ " instead of " ++ show exampleExpectedOutput)
input <- parseInput "input"
print $ compute input 100

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