2020-22 part 1 in haskell
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13
2020/22-Crab_Combat/example
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2020/22-Crab_Combat/example
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Player 1:
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9
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2
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6
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3
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1
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Player 2:
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5
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8
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4
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7
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10
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61
2020/22-Crab_Combat/first.hs
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2020/22-Crab_Combat/first.hs
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-- requires cabal install --lib megaparsec parser-combinators
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module Main (main) where
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import Control.Monad (void, when)
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import Data.List qualified as L
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import Data.Map qualified as M
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import Data.Maybe (catMaybes)
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import Data.Set qualified as S
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import Data.Void (Void)
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import Text.Megaparsec
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import Text.Megaparsec.Char
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import System.Exit (die)
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exampleExpectedOutput = 306
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type Card = Int
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type Deck = [Card]
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type Input = (Deck, Deck)
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type Parser = Parsec Void String
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parseCard :: Parser Card
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parseCard = do
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n <- some digitChar
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void $ optional (char '\n')
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return $ read n
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parseDeck :: Parser Deck
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parseDeck = string "Player " *> digitChar *> string ":\n" *> some parseCard
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parseInput' :: Parser Input
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parseInput' = do
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p1 <- parseDeck
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void $ char '\n'
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p2 <- parseDeck
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void $ eof
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return (p1, p2)
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parseInput :: String -> IO Input
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parseInput filename = do
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input <- readFile filename
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case runParser parseInput' filename input of
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Left bundle -> die $ errorBundlePretty bundle
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Right input' -> return input'
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computeScore :: Deck -> Int
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computeScore d = sum $ zipWith (*) d (reverse $ take (length d) [1..])
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compute :: Input -> Int
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compute ([], d) = computeScore d
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compute (d, []) = computeScore d
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compute (a:as, b:bs)
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| a > b = compute (as ++ [a, b], bs)
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| otherwise = compute (as, bs ++ [b, a])
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main :: IO ()
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main = do
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example <- parseInput "example"
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let exampleOutput = compute example
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when (exampleOutput /= exampleExpectedOutput) (die $ "example failed: got " ++ show exampleOutput ++ " instead of " ++ show exampleExpectedOutput)
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input <- parseInput "input"
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print $ compute input
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53
2020/22-Crab_Combat/input
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2020/22-Crab_Combat/input
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Player 1:
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48
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23
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9
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34
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37
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36
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40
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26
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49
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7
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12
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20
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6
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45
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14
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42
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18
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31
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39
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47
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44
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15
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43
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10
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35
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Player 2:
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13
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19
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21
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32
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27
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16
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11
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29
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41
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46
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33
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1
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30
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22
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5
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4
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50
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2
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3
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8
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25
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24
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