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Refactor day 16

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RhiobeT Chan
2023-12-16 15:56:38 +01:00
parent 322b2b50c0
commit 928cdccac1
2 changed files with 56 additions and 39 deletions
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11
advent-of-code-2023.cabal
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@@ -110,8 +110,9 @@ executable day15
default-language: Haskell2010
executable day16
main-is: Main.hs
other-modules: Commons Part1 Part2
build-depends: base ^>=4.15.1.0, array, containers
hs-source-dirs: day16
default-language: Haskell2010
main-is: Main.hs
other-modules: Commons Part1 Part2
build-depends: base ^>=4.15.1.0, array, containers
hs-source-dirs: day16
default-language: Haskell2010
default-extensions: LambdaCase

84
day16/Commons.hs
View File

@@ -11,12 +11,12 @@ type Cavern = Array (Int, Int) Tile
parseLine :: String -> [Tile]
parseLine [] = []
parseLine ('/': t) = Mirror: parseLine t
parseLine ('\\': t) = AntiMirror: parseLine t
parseLine ('-': t) = HSplitter: parseLine t
parseLine ('|': t) = VSplitter: parseLine t
parseLine ('.': t) = Empty: parseLine t
parseLine = map (\case
'/' -> Mirror
'\\' -> AntiMirror
'-' -> HSplitter
'|' -> VSplitter
'.' -> Empty)
parseCavern :: IO [[Tile]]
parseCavern = do done <- isEOF
@@ -32,36 +32,52 @@ parse = do cavern <- parseCavern
return (listArray ((1, 1), (length cavern, length $ head cavern)) $ concat cavern)
lightBeamEast :: (Int, Int) -> Direction -> Set (Int, Int, Direction) -> Cavern -> Set (Int, Int, Direction)
lightBeamEast (y, x) d en = lightBeam (y, x + 1) d (insert (y, x, East) en)
lightBeamSouth :: (Int, Int) -> Direction -> Set (Int, Int, Direction) -> Cavern -> Set (Int, Int, Direction)
lightBeamSouth (y, x) d en = lightBeam (y + 1, x) d (insert (y, x, South) en)
lightBeamWest :: (Int, Int) -> Direction -> Set (Int, Int, Direction) -> Cavern -> Set (Int, Int, Direction)
lightBeamWest (y, x) d en = lightBeam (y, x - 1) d (insert (y, x, West) en)
lightBeamNorth :: (Int, Int) -> Direction -> Set (Int, Int, Direction) -> Cavern -> Set (Int, Int, Direction)
lightBeamNorth (y, x) d en = lightBeam (y - 1, x) d (insert (y, x, North) en)
lightBeam :: (Int, Int) -> Direction -> Set (Int, Int, Direction) -> Cavern -> Set (Int, Int, Direction)
lightBeam (y, x) East en c
| member (y, x, East) en = en
| not (inRange (bounds c) (y, x + 1)) = insert (y, x, East) en
| let t = c ! (y, x + 1) in t == Empty || t == HSplitter = lightBeam (y, x + 1) East (insert (y, x, East) en) c
| c ! (y, x + 1) == Mirror = lightBeam (y, x + 1) North (insert (y, x, East) en) c
| c ! (y, x + 1) == AntiMirror = lightBeam (y, x + 1) South (insert (y, x, East) en) c
| c ! (y, x + 1) == VSplitter =
let en2 = lightBeam (y, x + 1) North (insert (y, x, East) en) c in lightBeam (y, x + 1) South en2 c
| member (y, x, East) en = en
| not $ inRange (bounds c) (y, x + 1) = insert (y, x, East) en
| otherwise =
case c ! (y, x + 1) of
Mirror -> lightBeamEast (y, x) North en c
AntiMirror -> lightBeamEast (y, x) South en c
VSplitter -> lightBeamEast (y, x) South (lightBeamEast (y, x) North en c) c
_ -> lightBeamEast (y, x) East en c
lightBeam (y, x) West en c
| member (y, x, West) en = en
| not (inRange (bounds c) (y, x - 1)) = insert (y, x, West) en
| let t = c ! (y, x - 1) in t == Empty || t == HSplitter = lightBeam (y, x - 1) West (insert (y, x, West) en) c
| c ! (y, x - 1) == Mirror = lightBeam (y, x - 1) South (insert (y, x, West) en) c
| c ! (y, x - 1) == AntiMirror = lightBeam (y, x - 1) North (insert (y, x, West) en) c
| c ! (y, x - 1) == VSplitter =
let en2 = lightBeam (y, x - 1) North (insert (y, x, West) en) c in lightBeam (y, x - 1) South en2 c
| member (y, x, West) en = en
| not $ inRange (bounds c) (y, x - 1) = insert (y, x, West) en
| otherwise =
case c ! (y, x - 1) of
Mirror -> lightBeamWest (y, x) South en c
AntiMirror -> lightBeamWest (y, x) North en c
VSplitter -> lightBeamWest (y, x) South (lightBeamWest (y, x) North en c) c
_ -> lightBeamWest (y, x) West en c
lightBeam (y, x) South en c
| member (y, x, South) en = en
| not (inRange (bounds c) (y + 1, x)) = insert (y, x, South) en
| let t = c ! (y + 1, x) in t == Empty || t == VSplitter = lightBeam (y + 1, x) South (insert (y, x, South) en) c
| c ! (y + 1, x) == Mirror = lightBeam (y + 1, x) West (insert (y, x, South) en) c
| c ! (y + 1, x) == AntiMirror = lightBeam (y + 1, x) East (insert (y, x, South) en) c
| c ! (y + 1, x) == HSplitter =
let en2 = lightBeam (y + 1, x) West (insert (y, x, South) en) c in lightBeam (y + 1, x) East en2 c
| member (y, x, South) en = en
| not $ inRange (bounds c) (y + 1, x) = insert (y, x, South) en
| otherwise =
case c ! (y + 1, x) of
Mirror -> lightBeamSouth (y, x) West en c
AntiMirror -> lightBeamSouth (y, x) East en c
HSplitter -> lightBeamSouth (y, x) East (lightBeamSouth (y, x) West en c) c
_ -> lightBeamSouth (y, x) South en c
lightBeam (y, x) North en c
| member (y, x, North) en = en
| not (inRange (bounds c) (y - 1, x)) = insert (y, x, North) en
| let t = c ! (y - 1, x) in t == Empty || t == VSplitter = lightBeam (y - 1, x) North (insert (y, x, North) en) c
| c ! (y - 1, x) == Mirror = lightBeam (y - 1, x) East (insert (y, x, North) en) c
| c ! (y - 1, x) == AntiMirror = lightBeam (y - 1, x) West (insert (y, x, North) en) c
| c ! (y - 1, x) == HSplitter =
let en2 = lightBeam (y - 1, x) West (insert (y, x, North) en) c in lightBeam (y - 1, x) East en2 c
| member (y, x, North) en = en
| not $ inRange (bounds c) (y - 1, x) = insert (y, x, North) en
| otherwise =
case c ! (y - 1, x) of
Mirror -> lightBeamNorth (y, x) East en c
AntiMirror -> lightBeamNorth (y, x) West en c
HSplitter -> lightBeamNorth (y, x) East (lightBeamNorth (y, x) West en c) c
_ -> lightBeamNorth (y, x) North en c