Files
advent-of-code-2023/day07/Commons.hs
2023-12-07 15:28:32 +01:00

54 lines
2.2 KiB
Haskell

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
getHandValueTypeFromSorted :: [Int] -> Int
getHandValueTypeFromSorted [a, b, c, d, e] | a == e = 6
| a == d || b == e = 5
| a == c && d == e || a == b && c == e = 4
| a == c || b == d || c == e = 3
| a == b && (c == d || d == e) || b == c && d == e = 2
| a == b || b == c || c == d || d == e = 1
| otherwise = 0
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