Day 7

day07/Commons.hs

@@ -0,0 +1,44 @@
+module Commons where
+
+import Data.List.Utils (split)
+import GHC.IO.Handle (isEOF)
+import Data.Char (digitToInt, isDigit)
+import Data.List (sortOn)
+
+
+data Hand = Hand { values :: [Int], bid :: Int } deriving Show
+data HandValue = HandValue { hand :: Hand, value :: Int } deriving Show
+
+
+parseValues :: String -> [Int]
+parseValues (v: t) | isDigit v = digitToInt v: parseValues t
+                   | v == 'T'  = 10:           parseValues t
+                   | v == 'J'  = 11:           parseValues t
+                   | v == 'Q'  = 12:           parseValues t
+                   | v == 'K'  = 13:           parseValues t
+                   | v == 'A'  = 14:           parseValues t
+parseValues [] = []
+
+parseHand :: String -> Hand
+parseHand handRaw = let valuesRaw: bidRaw: _ = split " " handRaw
+                    in Hand {values = parseValues valuesRaw, bid = read bidRaw}
+
+parse :: IO [Hand]
+parse = do done <- isEOF
+           if done
+              then return []
+              else do line <- getLine
+                      let hand = parseHand line
+                      otherHands <- parse
+                      return $ hand: otherHands
+
+
+getHandSecondValue :: [Int] -> Int
+getHandSecondValue [a, b, c, d, e] = 100 * (100 * (100 * (100 * a + b) + c) + d) + e
+
+sortHandValues :: [HandValue] -> [HandValue]
+sortHandValues = sortOn value
+
+getWinningsFromSorted :: Int -> [Hand] -> Int
+getWinningsFromSorted _ [] = 0
+getWinningsFromSorted i (hh: t) = i * bid hh + getWinningsFromSorted (i + 1) t