2023-22 part 1 in haskell

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
+2,7,196~5,7,196
+2,4,84~2,7,84
+4,2,150~4,5,150
+1,3,8~2,3,8
+7,7,136~7,8,136
+3,3,238~6,3,238
+3,1,25~5,1,25
+6,5,9~6,5,11
+0,9,109~2,9,109
+3,7,44~3,7,46
+5,7,37~5,9,37
+5,1,132~5,4,132
+6,8,100~7,8,100
+3,0,186~5,0,186
+2,3,305~2,5,305
+1,6,81~1,8,81
+1,0,325~3,0,325
+0,7,145~0,9,145
+3,5,135~4,5,135
+4,0,24~4,2,24
+0,0,188~0,0,190
+7,6,170~7,8,170
+5,1,186~7,1,186
+1,2,11~4,2,11
+5,1,271~8,1,271
+1,3,171~3,3,171
+2,0,187~2,3,187
+1,0,71~4,0,71
+1,7,295~1,8,295
+9,2,74~9,3,74
+3,7,233~3,9,233
+4,8,118~7,8,118
+2,7,24~2,9,24
+9,1,68~9,2,68
+2,9,144~3,9,144
+6,7,284~8,7,284
+6,9,95~6,9,96
+1,6,54~4,6,54
+8,2,204~8,3,204
+2,4,30~4,4,30
+2,2,42~3,2,42
+5,4,209~7,4,209
+8,6,24~8,8,24
+6,7,106~8,7,106
+6,7,181~6,9,181
+6,5,213~6,6,213
+5,1,75~5,2,75
+6,8,95~8,8,95
+6,4,230~7,4,230
+2,7,207~4,7,207
+2,0,100~3,0,100
+0,5,234~0,7,234
+0,7,226~0,7,228
+1,5,154~1,7,154
+1,3,297~1,5,297
+5,0,263~5,2,263
+9,7,288~9,8,288
+0,8,276~2,8,276
+1,3,47~3,3,47
+5,0,53~8,0,53
+5,4,264~7,4,264
+4,2,75~4,4,75
+3,0,312~3,3,312
+8,7,34~8,9,34
+7,0,101~9,0,101
+1,6,55~1,8,55
+0,7,205~1,7,205
+6,6,210~8,6,210
+1,9,272~3,9,272
+3,8,74~6,8,74
+4,8,286~6,8,286
+2,6,144~5,6,144
+7,5,23~7,5,24
+9,0,42~9,2,42
+3,5,131~5,5,131
+5,9,311~6,9,311
+0,7,207~0,7,207
+4,5,51~4,7,51
+9,6,40~9,8,40
+6,2,133~8,2,133
+9,4,233~9,4,233
+6,5,92~6,7,92
+0,4,326~3,4,326
+6,7,207~6,9,207
+6,4,166~6,7,166
+4,0,38~5,0,38
+5,3,252~7,3,252
+0,1,69~3,1,69
+5,1,69~7,1,69
+6,5,83~6,6,83
+8,8,218~8,9,218
+4,2,129~6,2,129
+7,0,233~7,2,233
+9,5,28~9,8,28
+1,7,232~4,7,232
+1,9,270~3,9,270
+6,7,220~6,7,221
+3,1,33~6,1,33
+5,6,102~7,6,102
+5,2,164~6,2,164
+9,4,110~9,6,110
+1,9,317~4,9,317
+8,0,109~8,3,109
+0,5,61~0,7,61
+1,4,225~1,6,225
+4,3,328~4,3,330
+1,8,280~3,8,280
+0,3,321~0,7,321
+2,8,72~3,8,72
+4,5,60~5,5,60
+4,3,195~4,5,195
+8,5,319~8,7,319
+4,4,149~5,4,149
+3,7,52~3,7,53
+7,5,67~9,5,67
+4,0,282~6,0,282
+6,6,192~6,7,192
+6,4,151~6,7,151
+3,2,106~6,2,106
+7,7,56~7,9,56
+7,2,1~7,4,1
+4,2,325~4,5,325
+0,3,51~2,3,51
+6,1,131~6,3,131
+8,0,241~8,3,241
+3,4,245~6,4,245
+6,7,286~9,7,286
+4,2,159~4,4,159
+3,5,299~3,7,299
+6,4,171~6,6,171
+7,0,238~9,0,238
+3,5,254~3,7,254
+6,3,86~6,5,86
+2,5,201~2,8,201
+1,8,274~2,8,274
+7,3,100~7,4,100
+4,8,192~5,8,192
+5,3,207~7,3,207
+7,4,316~8,4,316
+0,6,52~0,7,52
+7,7,101~9,7,101
+6,0,254~8,0,254
+2,6,245~6,6,245
+1,4,139~3,4,139
+9,3,305~9,4,305
+3,6,108~5,6,108
+1,6,249~1,6,250
+1,9,275~2,9,275
+0,4,292~0,6,292
+5,2,109~6,2,109
+3,7,256~3,7,259
+4,5,59~4,7,59
+1,5,27~1,8,27
+3,2,53~5,2,53
+5,9,26~7,9,26
+3,3,180~3,5,180
+6,3,24~6,5,24
+6,6,283~6,8,283
+9,1,289~9,3,289
+2,4,56~2,4,58
+6,4,97~9,4,97
+2,4,206~2,6,206
+4,9,277~5,9,277
+1,0,227~2,0,227
+6,6,121~6,8,121
+4,6,136~5,6,136
+3,1,55~6,1,55
+7,3,295~9,3,295
+5,6,122~5,9,122
+3,7,239~3,8,239
+1,5,235~1,7,235
+7,4,214~7,6,214
+5,6,21~7,6,21
+6,1,99~6,1,102
+7,2,323~8,2,323
+5,4,252~7,4,252
+0,7,25~2,7,25
+3,0,278~4,0,278
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+5,2,133~5,3,133
+4,3,152~6,3,152
+2,5,232~4,5,232
+3,1,181~3,4,181
+1,1,152~1,2,152
+4,4,251~6,4,251
+3,4,324~4,4,324
+5,3,60~5,3,60
+4,7,189~5,7,189
+5,2,36~7,2,36
+3,6,315~3,9,315
+6,8,104~6,8,106
+8,1,110~9,1,110
+2,8,42~2,9,42
+5,9,34~7,9,34
+7,0,288~7,3,288
+8,8,37~9,8,37
+5,7,90~5,9,90
+6,4,307~6,7,307
+9,5,233~9,8,233
+0,2,293~0,2,294
+9,2,45~9,2,45
+5,5,15~7,5,15
+1,2,41~3,2,41
+5,0,166~5,3,166
+6,5,105~6,7,105
+5,3,173~8,3,173
+4,6,115~4,8,115
+1,1,237~1,4,237
+6,5,194~9,5,194
+0,7,107~0,8,107
+5,1,142~6,1,142
+4,4,254~4,6,254
+4,6,134~6,6,134
+5,4,259~5,4,261
+4,3,297~4,4,297
+9,3,65~9,5,65
+1,3,52~2,3,52
+3,5,2~3,7,2
+7,2,270~7,4,270
+5,4,323~5,7,323
+3,1,150~3,2,150
+7,0,56~7,2,56
+9,0,35~9,3,35
+2,3,181~2,3,184
+2,7,185~5,7,185
+7,7,123~8,7,123
+8,4,294~8,7,294
+0,0,222~2,0,222
+4,0,254~5,0,254
+7,2,228~7,4,228
+5,1,260~5,2,260
+1,3,329~3,3,329
+9,5,153~9,7,153
+6,7,194~8,7,194
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+0,7,210~0,7,211
+8,8,49~8,9,49
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+0,7,204~3,7,204
+7,9,227~9,9,227
+3,2,242~3,2,243
+5,0,193~7,0,193
+0,5,47~0,5,50
+7,9,136~9,9,136
+0,4,293~0,4,297
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+7,4,146~7,5,146
+5,2,335~7,2,335
+1,9,322~4,9,322
+7,7,75~7,9,75
+9,9,140~9,9,141
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+4,1,324~4,2,324
+8,7,297~8,9,297
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+5,1,52~5,3,52
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+1,2,184~4,2,184
+2,7,62~5,7,62
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+7,9,37~7,9,39
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+7,0,52~9,0,52
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+0,3,13~0,4,13
+5,1,169~7,1,169
+3,5,59~3,8,59
+1,4,248~1,7,248
+0,4,88~2,4,88
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+0,8,49~0,8,52
+7,0,6~7,3,6
+2,5,31~4,5,31
+6,5,260~6,6,260
+4,4,285~7,4,285
+6,4,313~8,4,313
+3,3,149~3,6,149
+2,6,272~4,6,272
+7,1,182~9,1,182
+6,4,215~9,4,215
+7,1,181~7,1,181
+3,6,92~3,6,92
+3,7,263~6,7,263
+0,0,38~1,0,38
+0,4,226~0,4,228
+7,1,234~7,1,234
+5,8,18~8,8,18
+9,4,232~9,5,232
+6,3,288~6,6,288
+6,3,325~7,3,325
+4,2,122~4,3,122
+4,1,102~4,4,102
+4,1,105~5,1,105
+6,8,3~6,9,3
+3,1,155~6,1,155
+2,3,118~2,5,118
+5,5,209~8,5,209
+6,1,229~6,3,229
+2,4,122~4,4,122
+2,8,111~2,9,111
+3,5,126~3,7,126
+7,9,36~9,9,36
+7,0,210~9,0,210
+3,2,241~5,2,241
+1,7,56~1,9,56
+1,7,60~1,9,60
+4,2,120~4,4,120
+2,7,177~4,7,177
+1,2,232~2,2,232
+2,0,38~2,2,38
+5,9,4~7,9,4
+6,5,265~6,7,265
+2,8,5~4,8,5
+0,0,9~2,0,9
+3,7,42~3,9,42
+7,1,241~7,2,241
+4,7,216~7,7,216
+2,8,311~5,8,311
+2,1,9~3,1,9
+8,4,15~9,4,15
+5,3,94~5,3,97
+1,0,77~3,0,77
+1,9,202~5,9,202
+3,6,313~3,9,313
+2,8,45~4,8,45
+3,4,322~5,4,322
+1,3,182~1,5,182
+6,3,201~9,3,201
+2,5,291~2,5,292
+5,7,91~5,8,91
+3,0,318~5,0,318
+3,1,245~3,3,245
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