+-- import Debug.Trace
+
+import Data.Text (Text)
+import qualified Data.Text as T
+import qualified Data.Text.IO as TIO
+
+import Data.Attoparsec.Text
+-- import Data.Attoparsec.Combinator
+
+import qualified Data.Set as S
+
+main :: IO ()
+main =
+ do text <- TIO.readFile "data/advent06.txt"
+ let groups = successfulParse text
+ -- print groups
+ print $ part1 groups
+ print $ part2 groups
+
+part1 groups = sum $ map (S.size . S.unions) groups
+part2 groups = sum $ map (S.size . intersections) groups
+
+intersections :: Ord a => [S.Set a] -> S.Set a
+intersections group = foldl S.intersection (head group) group
+
+-- -- Parse the input file
+
+blankLines = skipMany1 endOfLine
+
+personP = S.fromList <$> many1 letter
+groupP = sepBy1 personP endOfLine
+
+groupsP = sepBy1 groupP blankLines
+
+-- successfulParse :: Text -> [Passport]
+successfulParse input =
+ case parseOnly groupsP input of
+ Left _err -> [] -- TIO.putStr $ T.pack $ parseErrorPretty err
+ Right groups -> groups
projects / advent-of-code-20.git / commitdiff