2020 day24/haskell: add solution

2020/README.md

@@ -25,5 +25,10 @@ https://adventofcode.com/2020/
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+|24 |        |  `**`   |      |
 
 `test.sh` can be used to run all solutions and automatically compares them to (my) puzzle inputs and the expected outputs.

2020/data/day24.expected

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+512
+4120

2020/data/day24.input

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2020/day24/day24.hs

@@ -0,0 +1,33 @@
+module Day24 where
+
+import AoC
+import Conway
+
+import Data.List
+import qualified Data.Set as S
+import Optics.Core hiding (Index)
+import Optics.TH
+
+data Coord = Coord { east :: Int
+                   , northeast :: Int
+                   } deriving (Eq, Ord)
+
+instance Index Coord where
+    neighbours c = map (addIndex c . uncurry Coord) offsets
+        where offsets = [(0, -1), (0, 1), (1, -1), (1, 0), (-1, 0), (-1, 1)]
+    addIndex (Coord x1 y1) (Coord x2 y2) = Coord (x1 + x2) (y1 + y2)
+
+parseSteps :: String -> Coord
+parseSteps [] = Coord 0 0
+parseSteps xs = case xs of
+                  ('n':'w':xs) -> go (-1, 1) xs
+                  ('w':xs)     -> go (-1, 0) xs
+                  ('s':'w':xs) -> go (0, -1) xs
+                  ('n':'e':xs) -> go (0, 1) xs
+                  ('e':xs)     -> go (1, 0) xs
+                  ('s':'e':xs) -> go (1, -1) xs
+    where go (e, ne) xs = addIndex (Coord e ne) $ parseSteps xs
+
+main = runAoC (onlySet . map parseSteps . lines) length (length . conwayN 100 . S.fromList)
+    where onlySet = map head . filter (odd . length) . group . sort
+          conwayN n = last . take n . tail . iterate (update (==2) (`notElem` [1, 2]))