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2023-14 in haskell

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Julien Dessaux 2024-01-12 00:03:57 +01:00
parent 2d31ebe29e
commit 1234d4b5bc
Signed by: adyxax
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10
2023/14-Parabolic_Reflector_Dish/example Normal file
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O....#....
O.OO#....#
.....##...
OO.#O....O
.O.....O#.
O.#..O.#.#
..O..#O..O
.......O..
#....###..
#OO..#....

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2023/14-Parabolic_Reflector_Dish/first.hs Normal file
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-- 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 = 136
data Tile = Cube | Empty | Round deriving (Eq)
instance Show Tile where
show Cube = "#"
show Empty = "."
show Round = "O"
type Row = [Tile]
type Input = [Row]
type Parser = Parsec Void String
parseTile :: Parser Tile
parseTile = char '#' $> Cube
<|> char '.' $> Empty
<|> char 'O' $> Round
parseRow :: Parser Row
parseRow = some parseTile <* eol
parseInput' :: Parser Input
parseInput' = some parseRow <* 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 input = sum $ map (fst . L.foldr weight (0, 1)) shiftedInput
where
transposedInput = L.transpose input
shiftedInput = map (shift 0) transposedInput
shift :: Int -> Row -> Row
shift n [] = replicate n Empty
shift n (Cube:xs) = replicate n Empty ++ Cube : shift 0 xs
shift n (Empty:xs) = shift (n+1) xs
shift n (Round:xs) = Round : shift n xs
weight :: Tile -> (Int, Int) -> (Int, Int)
weight Round (acc, i) = (acc + i, i+1)
weight _ (acc, i) = (acc, i+1)
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

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2023/14-Parabolic_Reflector_Dish/input Normal file
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...#O#O#.#...O...O...##...#..O#OO..OO....#.#OO....#.#.......O..O.#..#O.#......#.OO.....#....OO#....#
.#.##......O.O.#..#.OO..........#O.#....O.#..O............#.O.......#....OO.#.#..#O.O..#....O....O..
.#OO......O.O.O#O.#.##.....O...O....#O.O.OO.....OO...O..#O..O...O..#...O.#...#.....#O......O.....#..
O...##OO..O.O..##...O#..O#O.......#.OO..#....#...#.O....#.O..#O..#O...O.###.#....#.#..##.#...O...#.#
...#.#.....#....#O#...#..OO...#..#.......O.O..O##....O#.OOOOO.##.....O..#.O.OO..O.....O....#.O....OO
O#......O..#O##O........OO..#......#...#O..O..##.............O..#........O...##OOO.###O.O.##.O.#.O.O
.#O...OOO...#..O#.#.O.O..........#.O#..#.#....OO#O##.#...OO....#O.OO..#......#.......#...O..#.O.O##.
.#......#O..O..#..#.#.........O...#.#........O.#...O....#.O...#.......O#.O..#.#.....O...##....#.#O..
#..O..#OO...O##......#........O....O#..O.O..OO.OO....##O.OO...O##.#OO#...O..#..O....O.O.O.O...O.OO..
....##.O..OO.#.....##.#O#O.O.#..#...#..OO#......OO.......O.O.O.O..##..O.##......O...O.#..O...O.O.###
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.OOO...O....#O.#....#..O#..OO.....#.#......#OO..#........O.O.O.....#....O.O#.O.....O.OO.##O..O##....
...O#....#O...O..##..O.#..O#..OOOO#..OOO.#O#..#OO.O...O..#.#..#..#..#O..O.OO..O...O.O..OO...........
..OO###..##..#.....O....O.....O.#O.......O..O..##...O#...O#..#...O..O....O#.O##..............#....O#
.##.###.....###O....O.O..O...O.O..O.#......#O.#..O.O#.#O##O..O#.....O.#...........O..O....O...O.O...
...O.................#...........#.O.......O.....#..O.O.O.....O........##.OOO.#.....O.OO...........#
..O.O#...#O...O.#....#.OO..#O..#.....#.##.....OO....O..O...#...#..OO..O.O....#OO........#O.##....O..
O..#..O.#.O....O..#OO##.OO...O.##O..#..#.##..O#.#.OO.O........O....#O.OO.O.#O.O.#...##O##..OO..#.O..
...#.O#..........O###...#.O.#.O#.#.OO...OO#...O.....O..O..#.OO.....##...O#........#.O.O......#.O....
OO#..O.##..##OO..#....O..#.O..#..O.#...#O#.O..O###....O#O#.#..O#.##.#......#.....O..OO..........#O..
#O.##..#.....###.#O#...#O.##....#...O..#..#..##...#.#..#.#O...O.#.#O....##O..O.O...O.#.OO.##..O#.O..
#O#.....#O.....#.##.O..O....#..O.........#....#.O#.O..........#...O.O#..#.O.#....#.O..O.O#O.O.#O.#..
.O#.O..O#...#......O..#O#.O#....#...###.#.#.##.O#...#..#O#O.O...#.#...O...##.O#.#O.....O....O.......
O........O....##..##.OO.....OO...O..#..O#...O..O..OOO...O...O......#..##....O.#...O#O............#..
..#OO.OO.O..##...#........O......O.#O..O#.#O#.#...#.#...O.O....O......#....#.#..#.#............#..OO
...##O.O.......#...#O#..OO..O.O.#.#..##.........O##O..O..O#..O#.#O..O...O.......##OO..OO..#O..###O#.
.....#..O..........O.....O#...O.O#....#O#...O..#.#O#....#.#O......O....##......O..OOO#O...#...##O..#
......O##...OO.OO#.OO#..#...#...#.#...#OO...O.......#..O.O.O.##..#......O##....#......OO.#O..#O.O...
....OO....O##..O..O.O.......#....O.O....#.OO...O..#O.#..#.#O.#.....O..#.OO.OO..#....O.....O.O#O...O.
OOOO.O.#.#O#.O.........#O..O#O...O.#..#...O...O.OO..OO...#O#.##O.O.#...OO##...O..##OO..#O...O..O.OOO
#O.O.#.O.OO.O...#O#.#O.OO..O#O...O###....O....O.O.O.....O...#.OO.##....O.O..#......#..#O.O##...#.O#.
O#......O.#...O.....O.O..#.##.OO...O...O.......O.O.#...#OO..OO...OO..O.##.O...#O#.O........OO#....##
OO......O#.#..O...O...O..##O...O.###..O..OO...OO..O.#O...#.#...O.#.OO.......#.##...O......O#.....O..
.#..##.....OO...O...O..#.......O.O.#....O..#...O....O..O#...OO.......O...O.O.#..O.O....O.O.#.O.O.OO.
....O....O.#O#....#O#O..O.....#..#.O.O.O..O...O.O..O...O..#O#....O.O.............O..O...O....O......
..#.O....OOOO#OO#.#.O..O....O....O.#.#..O....#.O#.O......O...#.............O##.......#....O..######.
......OO##O..##O#.....O..OO.#..#O..##..#.O#........O.O...##OO......OO.#.#...#.OO...O.OO......O.O...#
OO..O....O..#.#.O#..O#O...###.O#.....O...##....OOO...#O..O..#OO.O#....##.O..O.........OOO.........O#
..O.O.O#O...OO..##....#.#...O...#.##.......##...#O.#O..#...##.....O.....OOO..O...O......#...OO...#.O
#O...OO.........OO.O....#OO......O##.O..##....O..#.O.O.O#.O.OO#O..O...#.#...#.#...O.OO...##.....##.O
...OOOOO.O...O#.......OO#.O..OO..#OO......O...#..O##.#....O#....O.O...#.....##.O....#..##..O..#.....
.OO.....O#....#....#O..O..OO#OOO..O#.......#O#..O.O..O..O##..O.......OO.......O.##...O.O..#........O
....O#.O......#..O.OO...OO#.#..O#....O..O#.#..#...O#..OO...#O#.....O...O.....##.#..#O.O..O#OO.O.#O.O
..O.#.#.....O#.O.....OOOO.O..#..#O.#.#O.#OO.....O..#..O..O..#O......##O.#O..#.OOO....#O.O.#O...#..O.
......#.O...O.O#....OO#..O#....#..O...O.......#OO...#...##O#O##.O...O...O......O##.O.O#.#OO.OO.O#...
....O...O.O..#..O........O..OO...OO#...OO.......O#.OOO#...OO#OO#O.O.O#OO.....O.###O..O#.O...#.......
#O.#OO.....##O.O....O..O.OO.#...O...#.O.O..O.OOO#.....O....#.....O...##...#...#..#........#..#.O..O.
...O#......O..O.#.......#....#O...OOOO...O..O.O.O.#O....#.....O..#...O..#..O..............#O....OO..
OO....O.#..O.#..#.#OO#...OO...O.#O...OO......#..O#..O..O#O...#OOO#..#.O...##.......#.#OO.O.###.O...#
.OO...#.O...#O.O.....O...##.#..O.#O.O.....O..O.....##...OO...O..#O..........#OO.#......O#...O#...O..
.O.#.O.O..........O...O.#.##OO....##........O.#.....O#O...#.O.....OOO#..........#..O..#..O.#O.#..O..
.O..#.....#O......O....O....O....#..#.....O...O...OO#...O..#...O...#...O.##OO.#.O#.OOO#OO#...#....#.
.OOO#.....O.O.#.OO.........#O##.OO##O..#..#OO.OOOO...O..#.#..O#....OO..#...O#O....#OOO.#...O.#..#...
...O#...#..#.#...O.#O..#.......#...#...O#......#O.O.#.OO.O#O.O.#.O....##..O#O.##.#.....OO..O......O.
..#.#.O.O.#..O..#.O....OO....O##.O.#...#O...O.OO.O......#..O.....#........O.#......O.#.##..OO...OO.#
....O...##....OO#O#O..#.O.##..O....##OO....O..OOO..#O..#.O...#.......O#.......OO.O.#..#.OO.O..#OO...
.#.....#O#.#OO#.#.#O##.O#....#.....#.##..O...#.....O#.O.O...O.O....#........#O...#..OO..O.#.OOOOO.O#
O....#O......O...O..O#..#.O..O.OO.....#.O.OO.O...#O.OOO....O.........#....#.#.O.##.#O...O.O#O.O#..#.
.OO.O..OOOO#.#.......O..................O......#..#...O.#O#O.....#..O..#O.#..........##.#O#.O..##...
..O...O.OO#.O##.##.#O....O....#...#...O...OOO........O.O..#.##......###.........##...O..O...OO...O.#
OOOO......#.O..OO.OO#..#...O.##.#O..O#.OO#.......#.O.O.OO.O.#OO#O.#...#......O#O..O.O....#O##.O..O.#
.......O..O...OO.#O..O....O#..#.##.......O...........#..#.....O......#.#..O.......O.O#..#.O.#O.OOO#.
#.#.O...##.......O...O..O.#..#....O##......O.##OO......OO.....O.O.##.#....#...O....#O#.#....#.O#..#.
O.O......O#.....#...#..#.O#..##O..O#O......O.......##..O.....#O.O...O..#..O..O...#.O.#..O..#.O#.#.O.
.#...OO#.O#.#.O.O.O..OO....OO....O...O#.O.#......#.O#.OO#.O..O.OO.O.#.O...OO.....###O..#.O.....O.O#O
..##OO...#..##.O#.......#......#.......O..OO.....O...OO...#..O..O..O..OO.O.O.O......O#...O.#..O.O#..
...#.O..#...O.#.##.O.OO..OO.....#..#..O..#..O.#..O..OO..O.#.#...##......#...#O.#....#O#...OOO#...#..
.......#O...#......O..O...#..O..#....#.O..O.##........#.....O....O...#O#OOOOOO..O.....##..O..#O.O...
#.O...OOO..O.O.###.#..O..OO.O....O##...#.O....OO.......O..........##...O...#.#.OO.###...O..........O
#....O#OO.OO#O..............#.#.#...O#OO.##.#...O.O....O....#O.#..#......O.....O..O.O#O......OO....O
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...OO.##.OOO...OO..O.O...#......O.....O.......O.O.OO..#O#O.O#....#....#..O##O....#OO#.......O..#...#
O.O..O#O....O.O#O.OO.O.....OOO..O...O.O.##.O.#O.O#.#.#O#......O.#.O..O.#.O....OO##.....#...O.#OOO...
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#.O.#.O#..#...O....O..O.O.OO##..........#..O...#.O#OO..O.O.#.........O#.O...O.....#O.O.O...#O...O.##
....#O...O....##.#.O.##O...#..#.#..O.O#..O..#O.#......#.......OO..O.....OOO#O....OO..#O.....O..#..O.
.OO#.....#.OOO....#.....#O###....O.##O...#.##..O.....O......O..O.OOOO.#...O.#..#.###...O..#..O..OO.#
...#O#..O#.O....O.OO.O.#.O..#...........O..#O.....O.....#OO.O#.O....O...#..O..O.#.O..##....##....O.O
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..O.#.......O.....#..#....O.O.#.O#OO...#.#.#.....#OO.#..#......#...#...#..#.......O#.....O####OO.#.O
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...#...O.....O...#....O...#...OO#.O#..#....O...........###.O#.....O.##O.O....O...O#....#...#.O...#..
...#..#....#.O.O..#O.#O.........##O....O.#OOO#.O##.#..O....#..#.O....O...OO#O..O.O.#....#.....#O#O#O
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O.O...#..#O...O##..#..O.#............#..#...##O.O.O....O..O.O...O##.#..O...O..OO..#...O........#....
#.O##..#.....OOO.O..##O...#.O...####.OOO...#...O..#..#......O...#.....#.O.O.O...O##......#...O....#.
...###O.#.O.OO.........O##.#...O..#......O#.#...##O........O.O..O#....O..#.#.O.#.##.O.O#O#....O#.O#O
O...O.O..O.#.......O..O.O....O..O..#..#.........#O.OO..O..O.#O..O.....O.....#O.........#..O.#.#..O..
..O#...#......O..OO...O.#.##O.OO.#...OO..#OO#....#.#.O#..#O.#.OO..O...O#.OO.O...O.#.#.....O..#O....#
....O..#.....#..#.#O.O.OO.#...#.O...#.....##.#..#...OO........O#..O.OO..O.O..O.#...#....O..##..O....

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-- 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 = 64
data Tile = Cube | Empty | Round deriving (Eq, Ord)
instance Show Tile where
show Cube = "#"
show Empty = "."
show Round = "O"
type Row = [Tile]
type Input = [Row]
type Parser = Parsec Void String
parseTile :: Parser Tile
parseTile = char '#' $> Cube
<|> char '.' $> Empty
<|> char 'O' $> Round
parseRow :: Parser Row
parseRow = some parseTile <* eol
parseInput' :: Parser Input
parseInput' = some parseRow <* 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 input = sum $ map (fst . L.foldr weight (0, 1)) (allPossibilities L.!! theOne)
where
transposedInput = L.transpose input
shift :: Int -> Row -> Row
shift n [] = replicate n Empty
shift n (Cube:xs) = replicate n Empty ++ Cube : shift 0 xs
shift n (Empty:xs) = shift (n+1) xs
shift n (Round:xs) = Round : shift n xs
weight :: Tile -> (Int, Int) -> (Int, Int)
weight Round (acc, i) = (acc + i, i+1)
weight _ (acc, i) = (acc, i+1)
theOne = start + (1_000_000_000 - start) `rem` (end - start)
(start, end) = cycle M.empty 0 allPossibilities
allPossibilities = iterate process transposedInput
process = step 4 (L.transpose . map (reverse . shift 0))
step :: Int -> (a -> a) -> a -> a
step 0 _ x = x
step n f x = step (n-1) f $ f x
cycle :: M.Map Input Int -> Int -> [Input] -> (Int, Int)
cycle m i (x:xs) = case M.lookup x m of
Just j -> (j, i)
Nothing -> cycle (M.insert x i m) (i+1) xs
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