diff options
| -rw-r--r-- | 2020/18-Operation_Order/example | 2 | ||||
| -rw-r--r-- | 2020/18-Operation_Order/first.hs | 80 | ||||
| -rw-r--r-- | 2020/18-Operation_Order/input | 381 |
3 files changed, 463 insertions, 0 deletions
diff --git a/2020/18-Operation_Order/example b/2020/18-Operation_Order/example new file mode 100644 index 0000000..29b7b33 --- /dev/null +++ b/2020/18-Operation_Order/example @@ -0,0 +1,2 @@ +1 + 2 * 3 + 4 * 5 + 6 +1 + (2 * 3) + (4 * (5 + 6)) diff --git a/2020/18-Operation_Order/first.hs b/2020/18-Operation_Order/first.hs new file mode 100644 index 0000000..d09ecf0 --- /dev/null +++ b/2020/18-Operation_Order/first.hs @@ -0,0 +1,80 @@ +-- requires cabal install --lib megaparsec parser-combinators +module Main (main) where +import Control.Monad (void, when) +import Data.Either +import Data.Void (Void) +import Text.Megaparsec +import Text.Megaparsec.Char +import System.Exit (die) + +exampleExpectedOutput = 71 + 51 + +data Operation = Add | Mul deriving (Eq, Show) +data Chain = Chain [Either Int Chain] [Operation] deriving Show +type Input = [Chain] + +type Parser = Parsec Void String + +parseInt :: Parser Int +parseInt = do + n <- some digitChar + void $ optional (char ' ') + return $ read n + +parseOp :: Parser Operation +parseOp = do + op <- (char '+' *> return Add) <|> (char '*' *> return Mul) + void $ char ' ' + return op + +parseParenthesis :: Parser Chain +parseParenthesis = do + void $ char '(' + a <- parseChain + void $ char ')' + void $ optional (char ' ') + return $ a + +parseChain :: Parser Chain +parseChain = do + a <- ((Left <$> parseInt) <|> (Right <$> parseParenthesis)) + next <- (Just <$> parseOp) <|> (return Nothing) + case next of + Nothing -> return $ Chain [a] [] + Just op -> do + Chain elems ops <- parseChain + return $ Chain (a:elems) (op:ops) + +parseInput' :: Parser Input +parseInput' = do + input <- some (parseChain <* void (optional (char '\n'))) + void eof + return $ input + +parseInput :: String -> IO Input +parseInput filename = do + input <- readFile filename + case runParser parseInput' filename input of + Left bundle -> die $ errorBundlePretty bundle + Right input' -> return input' + +compute' :: Chain -> Int +compute' (Chain [Left x] []) = x +compute' (Chain [Right x] []) = compute' x +compute' (Chain (x:y:xs) (op:ops)) + | op == Add = compute' $ Chain (Left (cx+cy):xs) ops + | op == Mul = compute' $ Chain (Left (cx*cy):xs) ops + where + cx = if isLeft x then fromLeft 0 x else compute' (fromRight (Chain [] []) x) + cy = if isLeft y then fromLeft 0 y else compute' (fromRight (Chain [] []) y) + +compute :: Input -> Int +compute input = sum $ map compute' input + +main :: IO () +main = do + example <- parseInput "example" + let exampleOutput = compute example + when (exampleOutput /= exampleExpectedOutput) (die $ "example failed: got " ++ show exampleOutput ++ " instead of " ++ show exampleExpectedOutput) + input <- parseInput "input" + print $ compute input diff --git a/2020/18-Operation_Order/input b/2020/18-Operation_Order/input new file mode 100644 index 0000000..da39d13 --- /dev/null +++ b/2020/18-Operation_Order/input @@ -0,0 +1,381 @@ +(7 * (7 * 6 * 4 + 3)) * 3 + ((8 + 5 * 3 + 7 + 8) + 3 * (2 + 9 * 5 + 7 * 5 * 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