X-Git-Url: https://git.njae.me.uk/?a=blobdiff_plain;f=advent04.hs;fp=advent04.hs;h=0000000000000000000000000000000000000000;hb=7267c0fa74db510564dc59587dd076372640114f;hp=b8c095ed4ca033040652a89564093a72a69e4c09;hpb=b66f0f79e01057fcb153ac16ce13ff50943a6d02;p=advent-of-code-16.git

diff --git a/advent04.hs b/advent04.hs
deleted file mode 100644
index b8c095e..0000000
--- a/advent04.hs
+++ /dev/null
@@ -1,66 +0,0 @@
-module Main(main) where
-
-import Data.List (last, intersperse, sortBy, intercalate, isInfixOf, init)
-import Data.List.Split (splitOn)
-import Data.Char (isLetter, ord, chr)
-import qualified Data.Map.Lazy as Map
-
-data Room = Room { name :: String
-                 , sector :: Int
-                 , checksum :: String
-                 } deriving (Show)
-
-main :: IO ()
-main = do 
-        instrText <- readFile "advent04.txt" 
-        let rooms = map (parseLine) $ lines instrText
-        part1 rooms
-        part2 rooms
-
-
-part1 :: [Room] -> IO ()
-part1 rooms = do 
-    print $ sum $ map (sector) validRooms
-    where 
-        validChecksum room = (checksum room) == makeChecksum (name room)
-        validRooms = filter (validChecksum) rooms
-
-part2 :: [Room] -> IO ()
-part2 rooms = do 
-    print $ fst $ head $ filter (\sn -> isInfixOf "north" (snd sn)) sectorNames
-    where 
-        validChecksum room = (checksum room) == makeChecksum (name room)
-        validRooms = filter (validChecksum) rooms
-        sectorNames = [((sector r),
-            shiftWord (sector r) (name r)) | r <- validRooms]
-
-
-parseLine :: String -> Room
-parseLine line = Room {name=name, sector=sector, checksum=checksum}
-    where components = splitOn "-" line
-          name = intercalate "-" $ init components
-          sector = read $ head $ splitOn "[" $ last components
-          checksum = filter (isLetter) $ last components
-
-countedLetters :: String -> [(Char, Int)]
-countedLetters name = sortBy sortCLetter $ unsortedCountedLetters name
-    where unsortedCountedLetters name = 
-            Map.toList $ Map.fromListWith (+) [(c, 1) | c <- filter (isLetter) name]
-
-sortCLetter :: (Char, Int) -> (Char, Int) -> Ordering
-sortCLetter (l1, n1) (l2, n2)
-    | n1 < n2 = GT
-    | n1 > n2 = LT
-    | n1 == n2 = compare l1 l2
-
-makeChecksum :: String -> String
-makeChecksum name = [l | (l, _) <- take 5 $ countedLetters name]
-
-
-shiftWord :: Int -> String -> String
-shiftWord shift letters = map (shiftLetter shift) letters
-
-shiftLetter :: Int -> Char -> Char
-shiftLetter shift letter
-    | isLetter letter = chr $ (ord letter - ord 'a' + shift) `mod` 26 + ord 'a'
-    | otherwise = ' '