diff options
Diffstat (limited to '2024/07-Bridge_Repair')
-rw-r--r-- | 2024/07-Bridge_Repair/example | 9 | ||||
-rw-r--r-- | 2024/07-Bridge_Repair/first.hs | 50 | ||||
-rw-r--r-- | 2024/07-Bridge_Repair/input | 850 | ||||
-rw-r--r-- | 2024/07-Bridge_Repair/second.hs | 51 |
4 files changed, 960 insertions, 0 deletions
diff --git a/2024/07-Bridge_Repair/example b/2024/07-Bridge_Repair/example new file mode 100644 index 0000000..fc6e099 --- /dev/null +++ b/2024/07-Bridge_Repair/example @@ -0,0 +1,9 @@ +190: 10 19 +3267: 81 40 27 +83: 17 5 +156: 15 6 +7290: 6 8 6 15 +161011: 16 10 13 +192: 17 8 14 +21037: 9 7 18 13 +292: 11 6 16 20 diff --git a/2024/07-Bridge_Repair/first.hs b/2024/07-Bridge_Repair/first.hs new file mode 100644 index 0000000..ba85958 --- /dev/null +++ b/2024/07-Bridge_Repair/first.hs @@ -0,0 +1,50 @@ +-- requires cabal install --lib megaparsec parser-combinators heap vector +module Main (main) where + +import Control.Applicative.Permutations +import Control.Monad (void, when) +import Data.Void (Void) +import Text.Megaparsec +import Text.Megaparsec.Char + +exampleExpectedOutput = 3749 + +data Equation = Equation Int [Int] deriving Show +type Input = [Equation] + +type Parser = Parsec Void String + +parseNumber :: Parser Int +parseNumber = read <$> some digitChar <* optional hspace + +parseEquation :: Parser Equation +parseEquation = Equation <$> parseNumber <* string ": " + <*> some parseNumber + +parseInput' :: Parser Input +parseInput' = some (parseEquation <* eol) <* eof + +parseInput :: String -> IO Input +parseInput filename = do + input <- readFile filename + case runParser parseInput' filename input of + Left bundle -> error $ errorBundlePretty bundle + Right input' -> return input' + +compute :: Input -> Int +compute = sum . map total . filter valid + where + total (Equation t _) = t + valid (Equation total numbers) = elem total $ combinations numbers + combinations [x] = [x] + combinations l = let x = last l + xs = init l + in concatMap (\n -> [x+n, x*n]) $ combinations xs + +main :: IO () +main = do + example <- parseInput "example" + let exampleOutput = compute example + when (exampleOutput /= exampleExpectedOutput) (error $ "example failed: got " ++ show exampleOutput ++ " instead of " ++ show exampleExpectedOutput) + input <- parseInput "input" + print $ compute input diff --git a/2024/07-Bridge_Repair/input b/2024/07-Bridge_Repair/input new file mode 100644 index 0000000..71a891e --- /dev/null +++ b/2024/07-Bridge_Repair/input @@ -0,0 +1,850 @@ +88045337: 4 7 80 453 37 +1607806: 4 348 49 228 92 1 14 +327264767: 58 8 992 711 +11278498: 658 7 169 25 374 95 1 +49032: 9 3 5 36 588 9 +7218: 6 599 4 2 9 2 +515788378563: 534 195 972 49 26 4 +95881986: 8 78 8 46 4 986 756 3 6 +24033: 77 3 5 3 5 4 33 1 +17081838: 1 588 29 827 8 +96767: 8 4 91 65 576 +277518129: 6 968 74 6 550 347 7 +36228: 36 130 81 7 9 +698187755: 997 4 1 7 756 +34951709: 7 6 7 2 8 765 9 97 1 9 1 7 +25662399: 1 60 7 6 4 23 9 6 +57179207: 14 1 50 2 1 463 89 +320286213: 5 6 99 75 95 5 3 3 1 6 2 7 +25533792: 557 53 1 3 40 55 4 4 9 8 +582217174: 350 467 90 8 5 166 89 +1435524: 31 4 41 52 2 +89048732059840: 908 846 69 69 71 2 40 +6437556: 34 67 9 6 1 5 1 3 2 9 179 +183858813930: 9 702 1 72 3 97 30 +374759592: 73 8 5 1 3 571 2 7 1 59 1 +383620: 220 2 1 9 192 4 1 +14632564: 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b/2024/07-Bridge_Repair/second.hs new file mode 100644 index 0000000..9535eac --- /dev/null +++ b/2024/07-Bridge_Repair/second.hs @@ -0,0 +1,51 @@ +-- requires cabal install --lib megaparsec parser-combinators heap vector +-- very slow with runghc, use ghc -O3 -o second second.hs and get the result in seconds +module Main (main) where + +import Control.Applicative.Permutations +import Control.Monad (void, when) +import Data.Void (Void) +import Text.Megaparsec +import Text.Megaparsec.Char + +exampleExpectedOutput = 11387 + +data Equation = Equation Int [Int] deriving Show +type Input = [Equation] + +type Parser = Parsec Void String + +parseNumber :: Parser Int +parseNumber = read <$> some digitChar <* optional hspace + +parseEquation :: Parser Equation +parseEquation = Equation <$> parseNumber <* string ": " + <*> some parseNumber + +parseInput' :: Parser Input +parseInput' = some (parseEquation <* eol) <* eof + +parseInput :: String -> IO Input +parseInput filename = do + input <- readFile filename + case runParser parseInput' filename input of + Left bundle -> error $ errorBundlePretty bundle + Right input' -> return input' + +compute :: Input -> Int +compute = sum . map total . filter valid + where + total (Equation t _) = t + valid (Equation total numbers) = elem total $ combinations numbers + combinations [x] = [x] + combinations l = let x = last l + xs = init l + in concatMap (\n -> [x+n, x*n, read (show n ++ show x)]) $ combinations xs + +main :: IO () +main = do + example <- parseInput "example" + let exampleOutput = compute example + when (exampleOutput /= exampleExpectedOutput) (error $ "example failed: got " ++ show exampleOutput ++ " instead of " ++ show exampleExpectedOutput) + input <- parseInput "input" + print $ compute input |