2020-03 in haskell
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2020/03-Toboggan_Trajectory/example
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2020/03-Toboggan_Trajectory/example
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2020/03-Toboggan_Trajectory/first.hs
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2020/03-Toboggan_Trajectory/first.hs
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-- requires cabal install --lib megaparsec
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module Main (main) where
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import Control.Monad (void, when)
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import Data.List (foldl')
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import Data.Void
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import Text.Megaparsec
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import Text.Megaparsec.Char
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import System.Exit (die)
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exampleExpectedOutput = 7
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type Line = [Bool]
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type Field = [Line]
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type Parser = Parsec Void String
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parseElt :: Parser Bool
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parseElt = do
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c <- (char '#') <|> (char '.')
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return $ c == '#'
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parseLine :: Parser Line
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parseLine = some parseElt <* char '\n'
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parseField :: Parser Field
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parseField = some parseLine <* eof
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parseInput :: String -> IO Field
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parseInput filename = do
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input <- readFile filename
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case runParser parseField filename input of
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Left bundle -> die $ errorBundlePretty bundle
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Right field -> return field
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compute :: Field -> Int
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compute field = snd $ foldl' tree (0, 0) field
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where
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tree :: (Int, Int) -> Line -> (Int, Int)
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tree (index, trees) l = (next index, trees + if l !! index then 1 else 0)
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next n = (n + 3) `mod` fieldLen
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fieldLen = length $ field !! 0
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main :: IO ()
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main = do
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example <- parseInput "example"
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let exampleOutput = compute example
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when (exampleOutput /= exampleExpectedOutput) (die $ "example failed: got " ++ show exampleOutput ++ " instead of " ++ show exampleExpectedOutput)
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input <- parseInput "input"
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print $ compute input
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2020/03-Toboggan_Trajectory/input
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2020/03-Toboggan_Trajectory/input
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.....#...#..##....#......#.....
|
||||
#..#..#....#.#...#..###.......#
|
||||
.....#.....#....#..#...#.#..##.
|
||||
#####........#...#..#..##..#.#.
|
||||
.#..#...#.##....#.#..#......###
|
||||
#.###.#..#.....##..##....#...#.
|
||||
.#...#.#####....##..........##.
|
||||
60
2020/03-Toboggan_Trajectory/second.hs
Normal file
60
2020/03-Toboggan_Trajectory/second.hs
Normal file
|
|
@ -0,0 +1,60 @@
|
|||
-- requires cabal install --lib megaparsec
|
||||
module Main (main) where
|
||||
|
||||
import Control.Monad (void, when)
|
||||
import Data.List (foldl')
|
||||
import Data.Void
|
||||
import Text.Megaparsec
|
||||
import Text.Megaparsec.Char
|
||||
import System.Exit (die)
|
||||
|
||||
exampleExpectedOutput = 336
|
||||
|
||||
type Line = [Bool]
|
||||
type Field = [Line]
|
||||
|
||||
type Parser = Parsec Void String
|
||||
|
||||
parseElt :: Parser Bool
|
||||
parseElt = do
|
||||
c <- (char '#') <|> (char '.')
|
||||
return $ c == '#'
|
||||
|
||||
parseLine :: Parser Line
|
||||
parseLine = some parseElt <* char '\n'
|
||||
|
||||
parseField :: Parser Field
|
||||
parseField = some parseLine <* eof
|
||||
|
||||
parseInput :: String -> IO Field
|
||||
parseInput filename = do
|
||||
input <- readFile filename
|
||||
case runParser parseField filename input of
|
||||
Left bundle -> die $ errorBundlePretty bundle
|
||||
Right field -> return field
|
||||
|
||||
computeOne :: Field -> Int-> Int
|
||||
computeOne field step = snd $ foldl' tree (0, 0) field
|
||||
where
|
||||
tree :: (Int, Int) -> Line -> (Int, Int)
|
||||
tree (index, trees) l = (next index, trees + if l !! index then 1 else 0)
|
||||
next n = (n + step) `mod` fieldLen
|
||||
fieldLen = length $ field !! 0
|
||||
|
||||
steps = [1, 3, 5, 7]
|
||||
|
||||
compute :: Field -> Int
|
||||
compute field = foldr (*) 1 (computeOne (skipEveryOtherLine field) 1 : map (computeOne field) steps)
|
||||
where
|
||||
skipEveryOtherLine :: Field -> Field
|
||||
skipEveryOtherLine [] = []
|
||||
skipEveryOtherLine (x:[]) = []
|
||||
skipEveryOtherLine (x:y:xs) = x : skipEveryOtherLine xs
|
||||
|
||||
main :: IO ()
|
||||
main = do
|
||||
example <- parseInput "example"
|
||||
let exampleOutput = compute example
|
||||
when (exampleOutput /= exampleExpectedOutput) (die $ "example failed: got " ++ show exampleOutput ++ " instead of " ++ show exampleExpectedOutput)
|
||||
input <- parseInput "input"
|
||||
print $ compute input
|
||||
Loading…
Add table
Reference in a new issue