diff options
Diffstat (limited to '')
| -rw-r--r-- | 2023/03-Gear_Ratios/example | 10 | ||||
| -rw-r--r-- | 2023/03-Gear_Ratios/first.hs | 71 | ||||
| -rw-r--r-- | 2023/03-Gear_Ratios/input | 140 | ||||
| -rw-r--r-- | 2023/03-Gear_Ratios/second.hs | 79 |
4 files changed, 300 insertions, 0 deletions
diff --git a/2023/03-Gear_Ratios/example b/2023/03-Gear_Ratios/example new file mode 100644 index 0000000..b20187f --- /dev/null +++ b/2023/03-Gear_Ratios/example @@ -0,0 +1,10 @@ +467..114.. +...*...... +..35..633. +......#... +617*...... +.....+.58. +..592..... +......755. +...$.*.... +.664.598.. diff --git a/2023/03-Gear_Ratios/first.hs b/2023/03-Gear_Ratios/first.hs new file mode 100644 index 0000000..9926363 --- /dev/null +++ b/2023/03-Gear_Ratios/first.hs @@ -0,0 +1,71 @@ +-- very slow with runghc, use ghc -O3 -o first first.hs +-- requires cabal install --lib megaparsec parser-combinators +module Main (main) where + +import Control.Applicative.Permutations +import Control.Monad (void, when) +import Data.Char qualified as C +import Data.Either +import Data.List qualified as L +import Data.Map qualified as M +import Data.Maybe +import Data.Set qualified as S +import Data.Void (Void) +import Text.Megaparsec +import Text.Megaparsec.Char + +exampleExpectedOutput = 4361 + +data Number = Number Int Int Int Int deriving Show -- Value x1 x2 y1 +data Symbol = Symbol Int Int deriving (Eq, Ord, Show) -- x y +data Input = Input [Number] [Symbol] deriving Show + +type Parser = Parsec Void String + +parseNumber :: Parser Number +parseNumber = do + (SourcePos _ y' x1') <- getSourcePos + value <- read <$> some digitChar + (SourcePos _ _ x2') <- getSourcePos + let (x1, x2, y) = (unPos x1', unPos x2' - 1, unPos y') + return $ Number value x1 x2 y + +parseSymbol :: Parser Symbol +parseSymbol = do + (SourcePos _ y' x') <- getSourcePos + void asciiChar + let (x, y) = (unPos x', unPos y') + return $ Symbol x y + +parseNumbersAndSymbols :: Parser (Either Number Symbol) +parseNumbersAndSymbols = do + many $ void (char '.') <|> void eol + something <- (Left <$> parseNumber) <|> (Right <$> parseSymbol) + many $ void (char '.') <|> void eol + return something + +parseInput' :: Parser Input +parseInput' = do + things <- some parseNumbersAndSymbols <* eof + return $ Input (lefts things) (rights things) + +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 (Input nums syms) = sum . map (\(Number v _ _ _) -> v) $ L.filter process nums + where + process :: Number -> Bool + process (Number _ x1 x2 y) = not . S.null $ S.fromList [Symbol x y|x<-[x1-1..x2+1],y<-[y-1..y+1]] `S.intersection` S.fromList syms + +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/2023/03-Gear_Ratios/input b/2023/03-Gear_Ratios/input new file mode 100644 index 0000000..15cb53f --- /dev/null +++ b/2023/03-Gear_Ratios/input @@ -0,0 +1,140 @@ +....401.............425.......323......791......697...............963............................................420........................ +...*..................................%......#.....*....290.........................492.............656...@953.....................+830..... 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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.List qualified as L +import Data.Map qualified as M +import Data.Maybe +import Data.Set qualified as S +import Data.Void (Void) +import Text.Megaparsec +import Text.Megaparsec.Char + +exampleExpectedOutput = 467835 + +data Number = Number Int Int Int Int deriving Show -- Value x1 x2 y1 +data Symbol = Symbol Int Int deriving (Eq, Ord, Show) -- x y +data Input = Input [Number] [Symbol] deriving Show + +type Parser = Parsec Void String + +parseNumber :: Parser Number +parseNumber = do + (SourcePos _ y' x1') <- getSourcePos + value <- read <$> some digitChar + (SourcePos _ _ x2') <- getSourcePos + let (x1, x2, y) = (unPos x1', unPos x2' - 1, unPos y') + return $ Number value x1 x2 y + +parseSymbol :: Parser Symbol +parseSymbol = do + (SourcePos _ y' x') <- getSourcePos + void $ char '*' + let (x, y) = (unPos x', unPos y') + return $ Symbol x y + +parseNumbersAndSymbols :: Parser (Either Number Symbol) +parseNumbersAndSymbols = do + many $ void (char '.' <|> symbolChar <|> char '#' <|> char '%' <|> char '@' <|> char '-' <|> char '/' <|> char '&') <|> void eol + something <- (Left <$> parseNumber) <|> (Right <$> parseSymbol) + many $ void (char '.') <|> void eol + return something + +parseInput' :: Parser Input +parseInput' = do + things <- some parseNumbersAndSymbols <* eof + return $ Input (lefts things) (rights things) + +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 (Input nums syms) = sum $ map process syms + where + process :: Symbol -> Int + process sym = case L.foldl' process' [] nums of + [a, b] -> a * b + _ -> 0 + where + process' :: [Int] -> Number -> [Int] + process' acc (Number v x1 x2 y') | not . S.null $ S.fromList [Symbol x y|x<-[x1-1..x2+1],y<-[y'-1..y'+1]] `S.intersection` S.singleton sym = v:acc + | otherwise = acc + +main :: IO () +main = do + example <- parseInput "example" + print example + let exampleOutput = compute example + when (exampleOutput /= exampleExpectedOutput) (error $ "example failed: got " ++ show exampleOutput ++ " instead of " ++ show exampleExpectedOutput) + input <- parseInput "input" + print $ compute input + |