-- Writeup at https://work.njae.me.uk/2022/12/04/advent-of-code-2022-day-4/
-import System.Environment
+import AoC
import Data.Text (Text)
import qualified Data.Text.IO as TIO
import Data.Attoparsec.Text hiding (Result)
print $ part1 pairs
print $ part2 pairs
-getDataFileName :: IO String
-getDataFileName =
- do args <- getArgs
- progName <- getProgName
- let baseDataName = if null args
- then progName
- else head args
- let dataFileName = "data/" ++ baseDataName ++ ".txt"
- return dataFileName
-
part1 :: [Pair] -> Int
part1 = length . (filter hasContainment)
disjoint (assignment1, assignment2) =
(assignment1 `before` assignment2) || (assignment2 `before` assignment1)
-overlaps pair = not $ disjoint pair
+overlaps = not . disjoint
contains, before :: Assignment -> Assignment -> Bool
contains (Assignment lower1 upper1) (Assignment lower2 upper2) =
(lower1 <= lower2) && (upper1 >= upper2)
-before (Assignment _lower1 upper1) (Assignment lower2 _upper2) = (upper1 < lower2)
+before (Assignment _lower1 upper1) (Assignment lower2 _upper2) =
+ (upper1 < lower2)
-- Parse the input file