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authorJulien Dessaux2023-11-30 17:09:56 +0100
committerJulien Dessaux2023-11-30 17:09:56 +0100
commit64286f54a74d6f45a25b5aa2e31742db90f20c75 (patch)
tree7a739e268655def33332cded39f00055ecf265e2 /2022/22-Monkey-Map
parent2022-22 part 1 in haskell (diff)
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2022-22 part 2 in haskell
Diffstat (limited to '2022/22-Monkey-Map')
-rw-r--r--2022/22-Monkey-Map/folding.excalidraw.svg21
-rw-r--r--2022/22-Monkey-Map/second.hs143
2 files changed, 164 insertions, 0 deletions
diff --git a/2022/22-Monkey-Map/folding.excalidraw.svg b/2022/22-Monkey-Map/folding.excalidraw.svg
new file mode 100644
index 0000000..2aa087e
--- /dev/null
+++ b/2022/22-Monkey-Map/folding.excalidraw.svg
@@ -0,0 +1,21 @@
+<svg version="1.1" xmlns="http://www.w3.org/2000/svg" viewBox="0 0 504.9434888958724 543.0610501033734" width="504.9434888958724" height="543.0610501033734" filter="invert(93%) hue-rotate(180deg)">
+ <!-- svg-source:excalidraw -->
+ <!-- payload-type:application/vnd.excalidraw+json --><!-- payload-version:2 --><!-- payload-start 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DAwNFxucXT46Vd357D/fI6P2NFwaJZ0Pro4STf8hFx1MDAwZn6hz1x1MDAwNCRcdTAwMGY/ovxccikkT/whtpTAXHUwMDBmg0D4XHQkXHUwMDE4UN/Rpbc4NvhcdTAwMDBcdTAwMTlurlmtXGZcbja7vmNP1Vx1MDAxZINfXGL76Vx1MDAwMENcZsPh12o1ZEOuXHUwMDBiP2V1corwe7zBdSfQR1x1MDAwMtHHJs+Lk1x1MDAxOO8yv6xn8zWM+T46Z1x1MDAxN6OrbsFcdTAwMDGjjd1XfFx1MDAxZrtcdTAwMGZvXHUwMDE1fJBQJbxcdTAwMTB8XHUwMDE46Z17zuNNsE9cdTAwMTEjgSyG5VdcdTAwMWHVXHUwMDBl+4V2vXbj3Gu5w2qve3tV3C34hWWYbFx1MDAwMH5SSuV5XHUwMDAw8EHcXHUwMDBlSIPfWyxcdTAwMDRlXHUwMDFjYlx1MDAxMl16b/KgX7s/g9XLQc88XHUwMDE0w/GtdpLyXHUwMDA0pzex5lx1MDAxMPZjnMCmXGaHX1x1MDAxM9Rb61t+XG59XHUwMDA0Syo+XG75yUDyQ5BwNaD5LK9V6KtiMixpXHUwMDFkWqKdgnhcdTAwMTJ3/dtbcZRy9MXwO3RBJWisID+trqhr/YBcdTAwMWZcdTAwMDCEkI/j9spA8kOAMUYxRdG1t3rTcoZcdTAwMTcjUqyx0eFQg19cdTAwMWLmuJNu+MV5XHUwMDE0flx1MDAwM/Dz3Dxlbyf/7pZ0wFx1MDAwZsHAW21cYjGBXGKNcaetXGZEc4yqJ7hwhonFndtyrmumXHUwMDFifW/udoQ5XHUwMDFlyaNcdTAwMGZcdTAwMTHsJTl8mKBcdTAwMGJcdTAwMGJ++akgROB5XHUwMDFieFx1MDAxNfog75/fVfFAa+/nSt+/Zq9uu/XT3UJfmN+xXHUwMDAxw48hTpX6flx1MDAxNLeDXHUwMDA3glx1MDAwZnovXHUwMDBlXHUwMDE3XHUwMDEykOjKW79cdTAwMWFccr5/zaPH8nNcdTAwMTbv48uaQa/X+u9S0vnYffLog0yxXHUwMDAxZztp+H16TZrMaL3epauazPx6YWTmydCf80tDXHUwMDA03peXfDlcdTAwMDGvXHUwMDA3XHUwMDEwffJqzJ+ffv5cdTAwMWabOqdcdTAwMDIifQ==<!-- payload-end -->
+ <defs>
+ <style class="style-fonts">
+ @font-face {
+ font-family: "Virgil";
+ src: url("https://excalidraw.com/Virgil.woff2");
+ }
+ @font-face {
+ font-family: "Cascadia";
+ src: url("https://excalidraw.com/Cascadia.woff2");
+ }
+ @font-face {
+ font-family: "Assistant";
+ src: url("https://excalidraw.com/Assistant-Regular.woff2");
+ }
+ </style>
+
+ </defs>
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diff --git a/2022/22-Monkey-Map/second.hs b/2022/22-Monkey-Map/second.hs
new file mode 100644
index 0000000..82752cd
--- /dev/null
+++ b/2022/22-Monkey-Map/second.hs
@@ -0,0 +1,143 @@
+-- requires cabal install --lib megaparsec parser-combinators vector
+module Main (main) where
+import Control.Monad (void, when)
+import Data.Functor
+import Data.List qualified as L
+import Data.Maybe
+import Data.Vector qualified as V
+import Data.Void (Void)
+import Text.Megaparsec
+import Text.Megaparsec.Char
+import System.Exit (die)
+
+exampleExpectedOutput = 5031
+
+type Line = V.Vector Char
+type Map = V.Vector Line
+data Instruction = Move Int | L | R deriving Show
+data Input = Input Map [Instruction] deriving Show
+
+type Parser = Parsec Void String
+
+parseMapLine :: Parser Line
+parseMapLine = do
+ line <- some (char '.' <|> char ' ' <|> char '#') <* char '\n'
+ return $ V.generate (length line) (line !!)
+
+parseMap :: Parser Map
+parseMap = do
+ lines <- some parseMapLine <* char '\n'
+ return $ V.generate (length lines) (lines !!)
+
+parseInstruction :: Parser Instruction
+parseInstruction = (Move . read <$> some digitChar)
+ <|> (char 'L' $> L)
+ <|> (char 'R' $> R)
+
+parseInput' :: Parser Input
+parseInput' = do
+ m <- parseMap
+ i <- some parseInstruction
+ void $ optional (char '\n') <* eof
+ return $ Input m i
+
+parseInput :: String -> IO Input
+parseInput filename = do
+ input <- readFile filename
+ case runParser parseInput' filename input of
+ Left bundle -> die $ errorBundlePretty bundle
+ Right input' -> return input'
+
+data Heading = N | S | E | W deriving (Eq, Show)
+data Cursor = Cursor Int Int Heading
+
+isOut :: Map -> Int -> Int -> Bool
+isOut m x y = isNothing line || isNothing tile || tile == Just ' '
+ where
+ line = m V.!? y
+ tile = fromJust line V.!? x
+
+stepOutside :: Map -> Int -> Int -> Int -> Heading -> Int -> Cursor
+stepOutside m s x y h i | (t, h) == (a, N) = proceed fw (fn + rx) E
+ | (t, h) == (a, W) = proceed dw (ds - ry) E
+ | (t, h) == (b, N) = proceed (fw + rx) fs N
+ | (t, h) == (b, E) = proceed ee (es - ry) W
+ | (t, h) == (b, S) = proceed ce (cn + rx) W
+ | (t, h) == (c, W) = proceed (dw + ry) dn S
+ | (t, h) == (c, E) = proceed (bw + ry) bs N
+ | (t, h) == (d, N) = proceed cw (cn + rx) E
+ | (t, h) == (d, W) = proceed aw (as - ry) E
+ | (t, h) == (e, E) = proceed be (bs - ry) W
+ | (t, h) == (e, S) = proceed fe (fn + rx) W
+ | (t, h) == (f, W) = proceed (aw + ry) an S
+ | (t, h) == (f, S) = proceed (bw + rx) bn S
+ | (t, h) == (f, E) = proceed (ew + ry) es N
+ where
+ (tx, rx) = x `divMod` s
+ (ty, ry) = y `divMod` s
+ t = (tx, ty)
+ proceed :: Int -> Int -> Heading -> Cursor
+ proceed x' y' h' = case m V.! y' V.! x' of
+ '.' -> step m s (Cursor x' y' h') (Move $ i - 1)
+ '#' -> Cursor x y h
+ a = (ax, ay)
+ b = (bx, by)
+ c = (cx, cy)
+ d = (dx, dy)
+ e = (ex, ey)
+ f = (fx, fy)
+ (ax, ay) = (1, 0)
+ (bx, by) = (2, 0)
+ (cx, cy) = (1, 1)
+ (dx, dy) = (0, 2)
+ (ex, ey) = (1, 2)
+ (fx, fy) = (0, 3)
+ (an, as, aw, ae) = (ay * s, (ay+1)*s-1, ax *s, (ax+1)*s-1)
+ (bn, bs, bw, be) = (by * s, (by+1)*s-1, bx *s, (bx+1)*s-1)
+ (cn, cs, cw, ce) = (cy * s, (cy+1)*s-1, cx *s, (cx+1)*s-1)
+ (dn, ds, dw, de) = (dy * s, (dy+1)*s-1, dx *s, (dx+1)*s-1)
+ (en, es, ew, ee) = (ey * s, (ey+1)*s-1, ex *s, (ex+1)*s-1)
+ (fn, fs, fw, fe) = (fy * s, (fy+1)*s-1, fx *s, (fx+1)*s-1)
+
+step :: Map -> Int -> Cursor -> Instruction -> Cursor
+step _ _ (Cursor x y N) L = Cursor x y W
+step _ _ (Cursor x y S) L = Cursor x y E
+step _ _ (Cursor x y E) L = Cursor x y N
+step _ _ (Cursor x y W) L = Cursor x y S
+step _ _ (Cursor x y N) R = Cursor x y E
+step _ _ (Cursor x y S) R = Cursor x y W
+step _ _ (Cursor x y E) R = Cursor x y S
+step _ _ (Cursor x y W) R = Cursor x y N
+step m _ c (Move 0) = c
+step m s (Cursor x y h) (Move i) | isOut m x' y' = stepOutside m s x y h i
+ | tile == '.' = step m s (Cursor x' y' h) (Move $ i - 1)
+ | tile == '#' = Cursor x y h
+ where
+ (x', y') = case h of
+ N -> (x, y-1)
+ S -> (x, y+1)
+ E -> (x+1, y)
+ W -> (x-1, y)
+ tile = m V.! y' V.! x'
+
+compute :: Input -> Int
+compute (Input m i) = 1000 * (y+1) + 4 * (x+1) + hv
+ where
+ xmin = length (V.filter (== ' ') (m V.! 0))
+ startingCursor = Cursor xmin 0 E
+ s = length (m V.! 0) `div` 3
+ Cursor x y h = L.foldl' (step m s) startingCursor i
+ hv = case h of
+ E -> 0
+ S -> 1
+ W -> 2
+ N -> 3
+
+main :: IO ()
+main = do
+ -- not doing the example, this solution is dependent on the shape of the input cube and sadly the example does not match it
+ -- 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