Day 22, with stack build system

[advent-of-code-16.git] / advent14c.hs

diff --git a/advent14c.hs b/advent14c.hs
deleted file mode 100644 (file)
index af8a4af..0000000
--- a/advent14c.hs
+++ /dev/null
@@ -1,45 +0,0 @@
-import Data.List (nub, tails)
-import Data.ByteString.Char8 (pack)
-import Crypto.Hash (hash, Digest, MD5)
-
-salt = "yjdafjpo"
--- salt = "abc"
-
-main :: IO ()
-main = do 
-        part1 
-        part2
-
-part1 :: IO ()
-part1 = print $ head $ drop 63 $ filter (\i -> possibleKey sq i && confirmKey sq i) [0..]
-    where sq = md5sequence
-
-part2 :: IO ()
-part2 = print $ head $ drop 63 $ filter (\i -> possibleKey sq i && confirmKey sq i) [0..]
-    where sq = md5sequenceS
-
-getHash :: String -> String
-getHash bs = show (hash $ pack bs :: Digest MD5)
-
-md5sequence :: [String]
-md5sequence = [makeMd5 i | i <- [0..]]
-    where makeMd5 i = getHash (salt ++ show i)
-
-md5sequenceS :: [String]
-md5sequenceS = [makeMd5 i | i <- [0..]]
-    where makeMd5 i = stretch $ getHash (salt ++ show i)
-          stretch h0 = foldr (\_ h -> getHash h) h0 [1..2016]
-
-possibleKey :: [String] -> Int-> Bool
-possibleKey s = not . null . repeats 3 . ((!!) s)
-
-confirmKey :: [String] -> Int -> Bool
-confirmKey s i = any (confirmation) $ take 1000 $ drop (i+1) s
-    where c = head $ repeats 3 $ s!!i
-          confirmation m = c `elem` (repeats 5 m)
-                              
-repeats :: Int -> String -> [String]
-repeats n = filter (null . tail) . map (nub) . substrings n
-
-substrings :: Int -> [a] -> [[a]]
-substrings l = filter (\s -> (length s) == l) . map (take l) . tails