Day 22, with stack build system

[advent-of-code-16.git] / adventofcode16 / app / advent06-old.hs

diff --git a/adventofcode16/app/advent06-old.hs b/adventofcode16/app/advent06-old.hs
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+module Main(main) where
+
+import Data.List (transpose)
+import Data.Char (isLetter)
+import qualified Data.Map.Lazy as Map
+
+main :: IO ()
+main = do 
+    text <- readFile "advent06.txt" 
+    let message = lines text
+    part1 message
+    part2 message
+
+part1 :: [String] -> IO ()
+part1 message = do 
+    print $ map (fst) $ map (mostCommon) $ map (countedLetters) $ transpose message
+
+part2 :: [String] -> IO ()
+part2 message = do 
+    print $ map (fst) $ map (leastCommon) $ map (countedLetters) $ transpose message
+
+
+countedLetters :: String -> Map.Map Char Int
+countedLetters name = Map.fromListWith (+) [(c, 1) | c <- filter (isLetter) name]
+
+mostCommon = Map.foldlWithKey (mostCommonP) ('a', 0)
+
+mostCommonP (letter0, count0) letter count
+    | count > count0 = (letter, count)
+    | otherwise = (letter0, count0)
+
+leastCommon = Map.foldlWithKey (leastCommonP) ('a', maxBound :: Int)
+
+leastCommonP (letter0, count0) letter count
+    | count < count0 = (letter, count)
+    | otherwise = (letter0, count0)
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