Day 02.

app/Main.hs

@@ -30,4 +30,4 @@ import qualified Day24
 import qualified Day25
 
 main :: IO ()
-main = Day01.main
+main = Day02.main

input/02.txt

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src/Day02.hs

@@ -1,6 +1,16 @@
 module Day02 (main) where
 
+import Data.List (group, sort, (\\), intersect)
+
+part1 :: [String] -> Int
+part1 strs = (length . filter (count 2) $ strs) * (length . filter (count 3) $ strs)
+    where count n = any (== n) . map length . group . sort
+
+part2 :: [String] -> String
+part2 strs = head [ls `intersect` rs | ls <- strs, rs <- strs, length (ls \\ rs) == 1]
+
 main :: IO ()
 main = do
-    input <- readFile "input/02.txt"
-    print input
+    input <- lines <$> readFile "input/02.txt"
+    print    $ part1 input
+    putStrLn $ part2 input