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Diffstat (limited to '')
| -rw-r--r-- | 2023/22-Sand_Slabs/example | 7 | ||||
| -rw-r--r-- | 2023/22-Sand_Slabs/first.hs | 109 | ||||
| -rw-r--r-- | 2023/22-Sand_Slabs/input | 1280 |
3 files changed, 1396 insertions, 0 deletions
diff --git a/2023/22-Sand_Slabs/example b/2023/22-Sand_Slabs/example new file mode 100644 index 0000000..43a7fc5 --- /dev/null +++ b/2023/22-Sand_Slabs/example @@ -0,0 +1,7 @@ +1,0,1~1,2,1 +0,0,2~2,0,2 +0,2,3~2,2,3 +0,0,4~0,2,4 +2,0,5~2,2,5 +0,1,6~2,1,6 +1,1,8~1,1,9 diff --git a/2023/22-Sand_Slabs/first.hs b/2023/22-Sand_Slabs/first.hs new file mode 100644 index 0000000..91b4d49 --- /dev/null +++ b/2023/22-Sand_Slabs/first.hs @@ -0,0 +1,109 @@ +-- requires cabal install --lib megaparsec parser-combinators heap vector +module Main (main) where + +import Control.Applicative.Permutations +import Control.Monad (void, when) +import qualified Data.Char as C +import Data.Either +import Data.Functor +import qualified Data.Heap as H +import qualified Data.List as L +import qualified Data.Map as M +import Data.Maybe +import qualified Data.Set as S +import qualified Data.Vector as V +import qualified Data.Vector.Unboxed as VU +import Data.Void (Void) +import Text.Megaparsec +import Text.Megaparsec.Char + +import Debug.Trace + +exampleExpectedOutput = 5 + +type Coord = (Int, Int, Int) +data Brick = Brick Coord Coord deriving (Eq, Show) +instance Ord Brick where + (Brick (_, _, z1) (_, _, z2)) `compare` (Brick (_, _, c1) (_, _, c2)) = min z1 z2 `compare` min c1 c2 +type Input = [Brick] + +type Parser = Parsec Void String + +parseNumber :: Parser Int +parseNumber = read <$> some digitChar <* optional (char ',') + +parseCoord :: Parser Coord +parseCoord = (,,) <$> parseNumber + <*> parseNumber + <*> parseNumber + +parseBrick :: Parser Brick +parseBrick = Brick <$> parseCoord <* char '~' + <*> parseCoord <* eol + +parseInput' :: Parser Input +parseInput' = some parseBrick <* 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' + +type Height = (Int, Maybe Int) -- (Height, BrickId that achieved that height - 1) +type HeightMap = V.Vector (V.Vector Height) +type SupportMap = M.Map Int [Int] -- BrickId -> [supports brickIds] + +compute :: Input -> Int +compute input = L.length $ L.filter (not . isSupportBrick) [0..(length input - 1)] + where + isSupportBrick :: Int -> Bool + isSupportBrick brickId = L.any isSoleSupport $ M.elems supportMap + where + isSoleSupport :: [Int] -> Bool + isSoleSupport [l] = brickId == l + isSoleSupport _ = False + (_, settledInput, heightMap, supportMap) = L.foldl' settle (0, [], startingHeightMap, M.empty) startingInput + where + settle :: (Int, Input, HeightMap, SupportMap) -> Brick -> (Int, Input, HeightMap, SupportMap) + settle (brickId, acc, hm, sm) (Brick (x1, y1, z1) (x2, y2, z2)) = (brickId+1, (Brick (a1, b1, height) (a2, b2, height-c1+c2)):acc, hm', sm') + where + (a1, a2, b1, b2, c1, c2) = (min x1 x2, max x1 x2, min y1 y2, max y1 y2, min z1 z2, max z1 z2) + (height, supports) = V.foldl' heightLine (0, []) (V.ifilter (\i _ -> i>= b1 && i <= b2) hm) + where + heightLine :: (Int, [Int]) -> V.Vector Height -> (Int, [Int]) -- height, [support] + heightLine acc line = V.foldl' heightElt acc (V.ifilter (\i _ -> i >= a1 && i <= a2) line) + where + heightElt :: (Int, [Int]) -> Height -> (Int, [Int]) + heightElt a@(hacc, _) (1, Nothing) | hacc > 1 = a + | otherwise = (1, []) + heightElt a@(hacc, sacc) (h, Just p) | hacc == h = (hacc, if elem p sacc then sacc else p:sacc) + | hacc > h = a + | otherwise = (h, [p]) + hm' = V.imap updateLine hm + where + updateLine :: Int -> V.Vector Height -> V.Vector Height + updateLine y line | y < b1 || y > b2 = line + | otherwise = V.imap updateElt line + where + updateElt :: Int -> Height -> Height + updateElt x z | x < a1 || x > a2 = z + | otherwise = (height+c2-c1+1, Just brickId) + sm' = M.insert brickId supports sm + startingHeightMap = V.replicate (ymax+1) (V.replicate (xmax+1) (1, Nothing)) + where + (xmax, ymax) = L.foldl' findBounds (xs, ys) input -- xmin and ymin are 0 for both example and input + where + Brick (xs, ys, _) _ = head input + findBounds :: (Int, Int) -> Brick -> (Int, Int) + findBounds (a, b) (Brick (x1, y1, _) (x2, y2, _)) = (maximum [a, x1, x2], maximum [b, y1, y2]) + startingInput = L.sort input + +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 diff --git a/2023/22-Sand_Slabs/input b/2023/22-Sand_Slabs/input new file mode 100644 index 0000000..30e822f --- /dev/null +++ b/2023/22-Sand_Slabs/input @@ -0,0 +1,1280 @@ +7,0,231~7,2,231 +3,8,44~4,8,44 +4,2,331~4,4,331 +4,3,236~4,4,236 +4,6,155~4,8,155 +7,5,141~7,7,141 +7,7,72~7,9,72 +4,8,190~6,8,190 +6,2,107~8,2,107 +0,4,122~0,5,122 +6,1,177~6,3,177 +5,5,247~5,8,247 +0,1,184~3,1,184 +5,3,306~5,4,306 +1,2,13~3,2,13 +0,7,198~2,7,198 +5,7,333~8,7,333 +5,6,281~5,6,282 +3,6,8~5,6,8 +2,2,277~2,3,277 +2,4,229~3,4,229 +1,3,121~2,3,121 +5,4,317~7,4,317 +4,4,103~5,4,103 +3,6,200~3,8,200 +3,2,248~3,2,250 +3,4,162~3,7,162 +6,7,169~6,9,169 +0,9,148~1,9,148 +6,0,190~7,0,190 +6,3,247~6,5,247 +0,0,289~0,1,289 +0,2,228~3,2,228 +8,8,230~8,8,233 +2,4,221~2,6,221 +4,0,215~4,0,217 +3,4,250~6,4,250 +9,3,205~9,3,205 +1,2,227~1,4,227 +1,5,322~4,5,322 +7,4,18~7,5,18 +7,9,220~8,9,220 +0,9,326~1,9,326 +9,6,90~9,8,90 +0,1,62~0,3,62 +4,6,264~6,6,264 +5,0,100~7,0,100 +4,0,212~7,0,212 +2,5,289~2,7,289 +8,6,67~9,6,67 +7,5,20~7,5,22 +6,4,27~7,4,27 +0,3,225~0,4,225 +3,2,161~5,2,161 +4,8,269~5,8,269 +3,9,115~4,9,115 +6,7,222~6,7,224 +8,1,78~8,1,80 +9,3,301~9,5,301 +4,6,35~6,6,35 +0,6,14~0,8,14 +3,6,9~3,7,9 +6,6,99~8,6,99 +2,1,150~2,4,150 +5,5,248~5,7,248 +3,4,110~6,4,110 +5,6,65~5,8,65 +8,6,46~8,8,46 +6,7,168~8,7,168 +0,4,23~1,4,23 +9,3,14~9,5,14 +4,2,30~4,2,32 +7,1,244~7,2,244 +2,5,179~2,8,179 +0,2,44~0,3,44 +6,2,7~6,5,7 +3,8,39~5,8,39 +3,7,117~5,7,117 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