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authorJulien Dessaux2024-12-19 09:21:11 +0100
committerJulien Dessaux2024-12-19 09:21:11 +0100
commitfe10994cdea4698fa93638b474ab07636fbf9262 (patch)
treed6846df94ffac829322ac9df6d085402d154b6bb /2024
parent2024-14 in haskell (diff)
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2024-15 in haskell
Diffstat (limited to '')
-rw-r--r--2024/15-Warehouse_Woes/example10
-rw-r--r--2024/15-Warehouse_Woes/example221
-rw-r--r--2024/15-Warehouse_Woes/first.hs109
-rw-r--r--2024/15-Warehouse_Woes/input71
-rw-r--r--2024/15-Warehouse_Woes/second.hs164
5 files changed, 375 insertions, 0 deletions
diff --git a/2024/15-Warehouse_Woes/example b/2024/15-Warehouse_Woes/example
new file mode 100644
index 0000000..8163605
--- /dev/null
+++ b/2024/15-Warehouse_Woes/example
@@ -0,0 +1,10 @@
+########
+#..O.O.#
+##@.O..#
+#...O..#
+#.#.O..#
+#...O..#
+#......#
+########
+
+<^^>>>vv<v>>v<<
diff --git a/2024/15-Warehouse_Woes/example2 b/2024/15-Warehouse_Woes/example2
new file mode 100644
index 0000000..84cf1fb
--- /dev/null
+++ b/2024/15-Warehouse_Woes/example2
@@ -0,0 +1,21 @@
+##########
+#..O..O.O#
+#......O.#
+#.OO..O.O#
+#..O@..O.#
+#O#..O...#
+#O..O..O.#
+#.OO.O.OO#
+#....O...#
+##########
+
+<vv>^<v^>v>^vv^v>v<>v^v<v<^vv<<<^><<><>>v<vvv<>^v^>^<<<><<v<<<v^vv^v>^
+vvv<<^>^v^^><<>>><>^<<><^vv^^<>vvv<>><^^v>^>vv<>v<<<<v<^v>^<^^>>>^<v<v
+><>vv>v^v^<>><>>>><^^>vv>v<^^^>>v^v^<^^>v^^>v^<^v>v<>>v^v^<v>v^^<^^vv<
+<<v<^>>^^^^>>>v^<>vvv^><v<<<>^^^vv^<vvv>^>v<^^^^v<>^>vvvv><>>v^<<^^^^^
+^><^><>>><>^^<<^^v>>><^<v>^<vv>>v>>>^v><>^v><<<<v>>v<v<v>vvv>^<><<>^><
+^>><>^v<><^vvv<^^<><v<<<<<><^v<<<><<<^^<v<^^^><^>>^<v^><<<^>>^v<v^v<v^
+>^>>^v>vv>^<<^v<>><<><<v<<v><>v<^vv<<<>^^v^>^^>>><<^v>>v^v><^^>>^<>vv^
+<><^^>^^^<><vvvvv^v<v<<>^v<v>v<<^><<><<><<<^^<<<^<<>><<><^^^>^^<>^>v<>
+^^>vv<^v^v<vv>^<><v<^v>^^^>>>^^vvv^>vvv<>>>^<^>>>>>^<<^v>^vvv<>^<><<v>
+v^^>>><<^^<>>^v^<v^vv<>v^<<>^<^v^v><^<<<><<^<v><v<>vv>>v><v^<vv<>v^<<^
diff --git a/2024/15-Warehouse_Woes/first.hs b/2024/15-Warehouse_Woes/first.hs
new file mode 100644
index 0000000..63299d1
--- /dev/null
+++ b/2024/15-Warehouse_Woes/first.hs
@@ -0,0 +1,109 @@
+-- requires cabal install --lib megaparsec parser-combinators heap vector
+module Main (main) where
+
+import Control.Monad (void, when)
+import Data.Functor
+import qualified Data.List as L
+import qualified Data.Vector as V
+import Data.Void (Void)
+import Text.Megaparsec
+import Text.Megaparsec.Char
+
+exampleExpectedOutput = 2028
+example2ExpectedOutput = 10092
+
+data Tile = Wall | Box | Floor | Robot deriving (Eq, Show)
+type Line = V.Vector Tile
+type Warehouse = V.Vector Line
+data Op = N | S | E | W deriving Show
+data Input = Input Warehouse [Op] deriving Show
+
+type Parser = Parsec Void String
+
+parseTile :: Parser Tile
+parseTile = char '#' $> Wall
+ <|> char 'O' $> Box
+ <|> char '.' $> Floor
+ <|> char '@' $> Robot
+
+parseLine :: Parser Line
+parseLine = do
+ line <- some parseTile <* eol
+ return $ V.generate (length line) (line !!)
+
+parseOp :: Parser Op
+parseOp = char '^' $> N
+ <|> char 'v' $> S
+ <|> char '>' $> E
+ <|> char '<' $> W
+
+parseInput' :: Parser Input
+parseInput' = do
+ line <- some parseLine <* eol
+ ops <- some (parseOp <* optional eol) <* eof
+ return $ Input (V.generate (length line) (line !!)) ops
+
+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'
+
+type Coord = (Int, Int)
+
+next :: Coord -> Op -> Coord
+next (x, y) N = (x, y-1)
+next (x, y) S = (x, y+1)
+next (x, y) E = (x+1, y)
+next (x, y) W = (x-1, y)
+
+compute :: Input -> Int
+compute (Input warehouse ops) = V.ifoldl' scoreBoxes 0 warehouse'
+ where
+ scoreBoxes :: Int -> Int -> Line -> Int
+ scoreBoxes acc y line = V.ifoldl' (scoreBox y) acc line
+ scoreBox :: Int -> Int -> Int -> Tile -> Int
+ scoreBox y acc x Box = acc + 100 * y + x
+ scoreBox _ acc _ _ = acc
+ warehouse' = fst $ L.foldl' step (warehouse, start) ops
+ step :: (Warehouse, Coord) -> Op -> (Warehouse, Coord)
+ step a@(w, r@(x, y)) op | t == Wall = a
+ | t == Box = case push w r' op of
+ Just w' -> let line = w' V.! y'
+ line' = line V.// [(x', Floor)]
+ w'' = w' V.// [(y', line')]
+ in (w'', r')
+ Nothing -> a
+ | otherwise = (w, (x', y'))
+ where
+ r'@(x', y') = next r op
+ t = w V.! y' V.! x'
+ push :: Warehouse -> Coord -> Op -> Maybe Warehouse
+ push w r@(x, y) op | t == Wall = Nothing
+ | t == Box = push w (x', y') op
+ | otherwise = Just w'
+ where
+ (x', y') = next r op
+ t = w V.! y' V.! x'
+ line = w V.! y'
+ line' = line V.// [(x', Box)]
+ w' = w V.// [(y', line')]
+ start = V.ifoldl' findRobot (0, 0) warehouse
+ findRobot :: (Int, Int) -> Int -> Line -> (Int, Int)
+ findRobot (0, _) y line = (V.ifoldl' findRobotInLine 0 line, y)
+ findRobot a _ _ = a
+ findRobotInLine :: Int -> Int -> Tile -> Int
+ findRobotInLine 0 x Robot = x
+ findRobotInLine a _ _ = a
+
+main :: IO ()
+main = do
+ example <- parseInput "example"
+ let exampleOutput = compute example
+ when (exampleOutput /= exampleExpectedOutput) (error $ "example failed: got " ++ show exampleOutput ++ " instead of " ++ show exampleExpectedOutput)
+ example2 <- parseInput "example2"
+ let example2Output = compute example2
+ when (example2Output /= example2ExpectedOutput) (error $ "example2 failed: got " ++ show example2Output ++ " instead of " ++ show example2ExpectedOutput)
+ input <- parseInput "input"
+ print $ compute input
diff --git a/2024/15-Warehouse_Woes/input b/2024/15-Warehouse_Woes/input
new file mode 100644
index 0000000..9947572
--- /dev/null
+++ b/2024/15-Warehouse_Woes/input
@@ -0,0 +1,71 @@
+##################################################
+##...O...#OO...O.#....#....#O#O..O..O......O..O..#
+#OOOO.#.O.O.....OO#...O.OO.O....O.#..OO....O#OOO.#
+#...#.#O..O...OO......O.......#....O..O#.O..OO...#
+#.O.....O..#.........O......OO..O..OO.OO....O.O..#
+#.....O.OO.O.#.O...O..#.OOOO..#...#.O.OO.O.#.#OO##
+#...OO.#..O.O.#.O..OO..O....O...OO.OOO.......O...#
+##.O.....O..#O...........O..O.....O.......OO.....#
+#...O..O....O...O...O...O..O..O...O......O..OO...#
+#.O##.O.OO.....O.O.#....O#.....OO.O.O.#..O....#O.#
+#.............#.O........OOO.OO..#.............O.#
+#OOO..O.O.........OO....O.#......#.OO.......O..O.#
+#.......#...O..#O.OO...O..#O.O...##O#O......O##..#
+#O#.O..#........O....O.....O...#O..#......O.O..O.#
+#O..O..O#...#.......OO.OO..O.....O..O..O.O.O...O.#
+#...O.O...OO.......#O#O...O.##.....#..O.O.....O..#
+#.#OOOO..OO..O....O.O....OO.#.OO..O.......O....#.#
+#..O...#.....#.....OO..#O....O#.O....O..OOO.O...O#
+#.O.......OO.O.#........OO...O..O#..O.#..##...#.O#
+#.O..#..........OO.O.O..O..O.......O...O.O.OO....#
+#.O..##..........OO..O..O.....#OO#...#..O....O...#
+#O.OOOO.O..O........O#.#OO.OO...OO.#OO..OO#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..OO..O#
+#...O..##O.#....#.......O..OO#..O.O.....##O....O.#
+#....O.O...O.OOO.O.O#..O..OOOOOOOOOO#.....O...#.O#
+#O.....#O..O..#..O....O.O..OOOO.#.O.O#....#.O.O#.#
+#..O.O..#O..............O....###..O#.O.....O.#O#O#
+#O...O.O.#.#..O......OO.OO#..O...O.O....O#.O...OO#
+#..OO.O#.....O##.O##....O..#..#..#O..O.....#....O#
+#....#..O..O....O.OO...O.......OO.OO...O.O.....O.#
+#....O.O.#O.#OO.......O......O........OOO..O.....#
+#..#...##.O......##.....O..O.O#.O...O....O..#.O..#
+#...O.O..O....O..O.OOOOOO...#.O...OO.#.....OO.O..#
+#O.......O....#.OO.OO...OO...##O......O.O........#
+##.O.OO.OO...O..O#......O.O....#.............O.#.#
+#O#O...O..O..OO.O.O...OO..O.O..OOOO..O..O...O..O.#
+#..OO.O#O..O..#.O..O.#...#..O.....OO..OOO..O...O.#
+#.O.O..OO.....O...O.....O..#..O..#.O.#.OOO...O.O.#
+#.O..O.......O...OO#.#..O....O...O....O..........#
+#....O..O.OO...OO..#....#O.OO.OO##.....O.........#
+#..O..O....O...O....OO#.#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.....#OO..O..#.#.#....O.O.OO.O.O......O#.#O..#
+#.O.O..O.O.O.O...O..O..OO..................#OO...#
+#..O....O....O.....OOO...OO..OO.......O....OO....#
+#.O....OO.O................OO....O.O#O.O.........#
+##################################################
+
+>v>>>^>>v>vv^v^^v^^^<v^vv^vv<<>^v^^^<<<vv<>vv^^>v>v^^><>^<v<v><>>^>^<^^v>v<>^^v<><<^><v>v^v<<^>^>^>^>>vvv>^<<^^^^^><vv>>^>^^>^vv>><v^^v^<<<>^^<<<^^^vv^<^<<<>v<^v<v>^<>v<^>>^v^<>><><<^<>v>^>^>v>>v>vv^><v<v^v>vv>><^^<<>>vv<<^vv>^^vv>>><^v^>>v<<<<v>^<><>^>v^vv>v>><><^vvv>^><<>^<<<vvv^>^vv<<>v^^^>v<>^^vv>vv^<>^<>vvv<vvvv^^^<^vv^<v^<<vv^v<><vvvv^>vv<>><><<v>><^>v<>v<v<v>^v>^<>^v>>><^>>v<<<v^>^v>v>^^>^v<v^v^^<vv^v^><<^^<v^v>>^v>>>>>v<v^>^>^v^>vv^v^><^<v>^^<>^v^>><>>><vv<<>^v<^vvv<v^vvv^>v<<v>>^>><<^v^^v>^^>^<<<>v^^>><<v>^<v^<^>v>>>^^^<<vvv^>vvv>^><v>^>vvv^^^v^^>v^><v>><>^<v<<vv^^>>^^v>><vv>vvv>^>>>vv^><^<v<<<^^v>v^<v^^>^^<<<>v^vv<vvv>^v>v<^^>vv>v<>>vv<><v>v<^^<<^>>v<v^<>^<<v>><<vv^<<<<v^^^v^^<^<^<>v><^<>>v>v>v>v>v><v>>v<<^>>><v^v<v>>v^><^v^>>>^>^<<>>^^v><^<v^vv^<><>>v^^>v<vvv>v<>><<<<<>><<><v<>vv><^^^><vv<v<<>v^>v>>^^v^v^>vvv<v^<>><<<^>vvv><^^v>v<>v><^<v>v<^<<^<>v>>>>^<>^^^>v<v<<vv><v>>>^<^>v^><vv>^<<v<>><<^<>>>^v>><<>v^^v<^>v^v^>vvvv>vv<<>^^^<v>^<<v>>><<>>>vv^<^><><^^^>^v^<><>^<vv<^vv^^v>^<
+<^>vv>v>^^>^vvvv<<^><^<>>^<v>v>>^^<v><^<>><<<>^vv<>v<v^>>>^<<^<><<>^^vv^^<<><<vvv>v^^>vv^<v<<>>v><^>v^>>^^v<<<<^v<v<<>>v><v^>vv^<vv^>^v>^^>>><>v<><^v><vvvv^v<<>>^^v><>>vv^>v>v^>^>v<><^v>v^^<<>^v^>^>v<><^v<^^vv<>^^^v^>>><<><<<<v^v^><v<v<^^^><><^<<^^^vv<^^<^<v>v<<v^>>v<>>^<vv<^<v><>^<^v^>^v>>>^v>>v^>^^v^>><<v>>^<v>^vvv<v<<<v>^<>vv<^<v<>^<>v^v^>vv^v>><^>><>^^^<<v<vv^<vv>>v<^^^>vv<^^>vv^^^^<<^<v^>v<v>vvv<v<<^^><v<<^>^^<>v>>v><^v^<v>vv^<v<<v>v>vvv^>v<vv>>>>>^^v<<>^><>v^^^>^^>^>^^vvvv^v<v>>^^^v>>^<v<^^v>>><<>^^><<<^>v^^^v><v<v<v^v^><>^>v<v<^^^>>>vv><<^>><v>><<v<<vv><^^^<<^<>v>^v^v><<<<<<>>vv^<<<><<><><<^<^>^<v<^v>>>^>v^>^v>^v^<^>^v>><<<v>v^^vvv><<^>v^^<><v^>><<v><^^>>v<<<<<^>>><><vv>v<<>>^v<><<^>>v<<<^<^>>^>v^>^v<v>^v>>v<^>><<>><>vvv<<>vv^>v>><><<^><vvv>v><^>^<^v><>>v><v><^v^vv><>^^>>>v<^v^<^v>^v><vv<<v<<v><>>><v<vv<>>v^^>>>vv><v<<<<><v^^>>v>^<v^^>^v<<<><v>v>>^^<vv<v^v>><^<^^<>><v>^<^^<><^^^><>^<v^^^<v<^>>^v>vv^^<^v>><<vv><<v>><v>>>^>>><<<v<<><^vvv^<v>^>vvv^v>>v><<>v><<v<vvvvv^>^>><v^>vv^>>^
+vvv^v^><<v<>><><><<<^v>^v^><>^vvv<<^<<v^v<>>v<v^^>>^>v<v>^v<v^v>^<<vvv<^^v<<<<>v^v<<<v<^>><v^vv^vvvv^v><><v<<^>v>v^v^<v<v<^<><^>^vv<^^v<^^>vv<<>^^<>><<<<^^>>>^<^^>vv<>>>^^^^vv^>^v^v^^>^<<<>v^<v>^^^>v<^^<<^<v><^vvv>v>v>v<^>><^<^<>>>^^<<<vv^>>><>>v><>^<>^^<v^><<vv>vv^v<<>^>v><vvv>v^>>v^^^v<<>>^v><^<>^>^<^>^^<vv<>>><v^v^>>>^^>>^v^^^>>^v>v><^^^v<>>vv>>v^^<><^^v>v<^>>v<v^v^v^v^vv^vvv>v^vv>^v>vv<vv<^<<<v^v><<v>v<<^>vvv^^^^>>^>v>^^<>vv<>^^v><v<<^v><><><^<vv^>v^^>>>^^vv>^v>^<>vvv^v<^vv^<<^<^^<>>^<<><vv^>^>^^v^<v><v^>><^^>><<><<<<<<^>^><^v>^v>><v><v<>vvv>^^<^<<>v>>vv<v<><^<<^<>v<v>><><>^v><v<^^^<>>vvv>^^>>>v><v><^^>><<^<v><<^<v<<vv>>^vv<>v>^><><<<<<v>>>v^^v>^<>^<>v^^>>^<>>v^>^<>>>><>><v^v>>v>^<<^v^><<>>^v>><>><>>>><>vv<<>>^>v^v^<vvvvvvv^>v<<<^^<>vvvv^<<><<v^<<vv^^^v^^<<><v>v^^<^^v^^<>^v<>vvv>>^^v^^^<v>v^^vv<^^^<<>^v^>>^^<<^^v^^v<<vv^<<>>>v<>vv<v^v<<>vvv>^<v>v>^v<^^v<>^>^<><<v>v<>v^>v^v>><<><v><>>>>v^<^<^><>^v^<^><<v<^v><>>^v^^^v^><>^v>v<<^v>>^<<v<>v<^<<<<>>^><<<vv<^v^<^>^^><^^vvv^><v<><^^<>^v^>
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diff --git a/2024/15-Warehouse_Woes/second.hs b/2024/15-Warehouse_Woes/second.hs
new file mode 100644
index 0000000..5f5f948
--- /dev/null
+++ b/2024/15-Warehouse_Woes/second.hs
@@ -0,0 +1,164 @@
+-- requires cabal install --lib megaparsec parser-combinators heap vector
+module Main (main) where
+
+import Control.Monad (void, when)
+import Data.Functor
+import qualified Data.List as L
+import qualified Data.Vector as V
+import Data.Void (Void)
+import Text.Megaparsec
+import Text.Megaparsec.Char
+
+exampleExpectedOutput = 9021
+
+data Tile = Wall | Box | Lbox | Rbox | Floor | Robot deriving (Eq, Show)
+type Line = V.Vector Tile
+type Warehouse = V.Vector Line
+data Op = N | S | E | W deriving (Eq, Show)
+data Input = Input Warehouse [Op] deriving Show
+
+type Parser = Parsec Void String
+
+parseTile :: Parser Tile
+parseTile = char '#' $> Wall
+ <|> char 'O' $> Box
+ <|> char '.' $> Floor
+ <|> char '@' $> Robot
+
+parseLine :: Parser Line
+parseLine = do
+ line <- some parseTile <* eol
+ return $ V.generate (length line) (line !!)
+
+parseOp :: Parser Op
+parseOp = char '^' $> N
+ <|> char 'v' $> S
+ <|> char '>' $> E
+ <|> char '<' $> W
+
+parseInput' :: Parser Input
+parseInput' = do
+ line <- some parseLine <* eol
+ ops <- some (parseOp <* optional eol) <* eof
+ return $ Input (V.generate (length line) (line !!)) ops
+
+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'
+
+type Coord = (Int, Int)
+
+next :: Coord -> Op -> Coord
+next (x, y) N = (x, y-1)
+next (x, y) S = (x, y+1)
+next (x, y) E = (x+1, y)
+next (x, y) W = (x-1, y)
+
+showWarehouse :: Warehouse -> String
+showWarehouse w = V.foldl' showOne [] w
+showOne acc line = acc ++ (V.foldl' showTile [] line) ++ "\n"
+showTile acc Wall = acc ++ "#"
+showTile acc Lbox = acc ++ "["
+showTile acc Rbox = acc ++ "]"
+showTile acc Floor = acc ++ "."
+showTile acc Robot = acc ++ "@"
+showTile acc Box = acc ++ "O"
+
+compute :: Input -> Int
+compute (Input warehouse ops) = V.ifoldl' scoreBoxes 0 warehouse''
+ where
+ scoreBoxes :: Int -> Int -> Line -> Int
+ scoreBoxes acc y line = V.ifoldl' (scoreBox y) acc line
+ scoreBox :: Int -> Int -> Int -> Tile -> Int
+ scoreBox y acc x Lbox = acc + 100 * y + x
+ scoreBox _ acc _ _ = acc
+ warehouse'' = fst $ L.foldl' step (warehouse', start) ops
+ step :: (Warehouse, Coord) -> Op -> (Warehouse, Coord)
+ step a@(w, r@(x, y)) op | t == Wall = a
+ | t == Lbox = case push w r' op of
+ Just w' -> (w', r')
+ Nothing -> a
+ | (op == N || op == S) && t == Rbox = case push w (x'-1, y') op of -- we want to always push boxes from their left side to reduce push cases
+ Just w' ->(w', r')
+ Nothing -> a
+ | t == Rbox = case push w (x', y') op of
+ Just w' -> (w', r')
+ Nothing -> a
+ | otherwise = (w, (x', y'))
+ where
+ r'@(x', y') = next r op
+ t = w V.! y' V.! x'
+ push :: Warehouse -> Coord -> Op -> Maybe Warehouse
+ push w r@(x, y) op | t == Wall = Nothing
+ | (op == N || op == S) && tr == Wall = Nothing
+ | (op == N || op == S) && t == Lbox = case push w (x, y') op of -- pushing a boxes that matches ours
+ Just w' -> let l1 = w' V.! y
+ l1' = l1 V.// [(x, Floor), (x+1, Floor)]
+ l2 = w' V.! y'
+ l2' = l2 V.// [(x, Lbox), (x+1, Rbox)]
+ in Just (w' V.// [(y, l1'), (y', l2')])
+ Nothing -> Nothing
+ | (op == N || op == S) && t == Rbox = case push w (x-1, y') op of
+ Just w' -> if tr == Lbox then case push w' (x+1, y') op of -- are we pushing two boxes?
+ Just w'' -> let l1 = w'' V.! y
+ l1' = l1 V.// [(x, Floor), (x+1, Floor)]
+ l2 = w'' V.! y'
+ l2' = l2 V.// [(x, Lbox), (x+1, Rbox)]
+ in Just (w'' V.// [(y, l1'), (y', l2')])
+ Nothing -> Nothing
+ else let l1 = w' V.! y -- or just one on our left
+ l1' = l1 V.// [(x, Floor), (x+1, Floor)]
+ l2 = w' V.! y'
+ l2' = l2 V.// [(x, Lbox), (x+1, Rbox)]
+ in Just (w' V.// [(y, l1'), (y', l2')])
+ Nothing -> Nothing
+ | (op == N || op == S) && tr == Lbox = case push w (x+1, y') op of -- or just one on our right
+ Just w' -> let l1 = w' V.! y
+ l1' = l1 V.// [(x, Floor), (x+1, Floor)]
+ l2 = w' V.! y'
+ l2' = l2 V.// [(x, Lbox), (x+1, Rbox)]
+ in Just (w' V.// [(y, l1'), (y', l2')])
+ Nothing -> Nothing
+ | (op == N || op == S) = let l1 = w V.! y -- free space
+ l1' = l1 V.// [(x, Floor), (x+1, Floor)]
+ l2 = w V.! y'
+ l2' = l2 V.// [(x, Lbox), (x+1, Rbox)]
+ in Just (w V.// [(y, l1'), (y', l2')])
+ | t == Lbox || t == Rbox = case push w (x', y) op of -- East-West movements are simpler
+ Just w' -> let l = w' V.! y
+ l' = l V.// [(x, Floor), (x', to)]
+ in Just (w' V.// [(y, l')])
+ Nothing -> Nothing
+ | otherwise = let l = w V.! y -- free space
+ l' = l V.// [(x, Floor), (x', to)]
+ in Just (w V.// [(y, l')])
+ where
+ (x', y') = next r op
+ t = w V.! y' V.! x'
+ tr = w V.! y' V.! (x'+1)
+ to = w V.! y V.! x
+ start = V.ifoldl' findRobot (0, 0) warehouse'
+ findRobot :: (Int, Int) -> Int -> Line -> (Int, Int)
+ findRobot (0, _) y line = (V.ifoldl' findRobotInLine 0 line, y)
+ findRobot a _ _ = a
+ findRobotInLine :: Int -> Int -> Tile -> Int
+ findRobotInLine 0 x Robot = x
+ findRobotInLine a _ _ = a
+ wideWidth = 2 * V.length (warehouse V.! 0)
+ warehouse' = V.map widen warehouse
+ widen line = V.ifoldl' widenOne (V.replicate wideWidth Floor) line
+ widenOne acc x Wall = acc V.// [(2*x, Wall), (2*x+1, Wall)]
+ widenOne acc x Box = acc V.// [(2*x, Lbox), (2*x+1, Rbox)]
+ widenOne acc x Robot = acc V.// [(2*x, Robot)]
+ widenOne acc _ _ = acc
+
+main :: IO ()
+main = do
+ example <- parseInput "example2"
+ let exampleOutput = compute example
+ when (exampleOutput /= exampleExpectedOutput) (error $ "example failed: got " ++ show exampleOutput ++ " instead of " ++ show exampleExpectedOutput)
+ input <- parseInput "input"
+ print $ compute input