From 642a3c5773ee1704212cdae0a3173d9f6d8d0349 Mon Sep 17 00:00:00 2001 From: Samae Date: Sun, 1 Dec 2024 12:59:54 +0200 Subject: [PATCH] Day 1 --- inputs/day1-example.input | 6 + inputs/day1-example.solution | 1 + inputs/day1.input | 1000 ++++++++++++++++++++++++++++++++++ package.yaml | 2 + src/Day1.hs | 44 ++ 5 files changed, 1053 insertions(+) create mode 100644 inputs/day1-example.input create mode 100644 inputs/day1-example.solution create mode 100644 inputs/day1.input diff --git a/inputs/day1-example.input b/inputs/day1-example.input new file mode 100644 index 0000000..b8af9ad --- /dev/null +++ b/inputs/day1-example.input @@ -0,0 +1,6 @@ +3 4 +4 3 +2 5 +1 3 +3 9 +3 3 diff --git a/inputs/day1-example.solution b/inputs/day1-example.solution new file mode 100644 index 0000000..b4de394 --- /dev/null +++ b/inputs/day1-example.solution @@ -0,0 +1 @@ +11 diff --git a/inputs/day1.input b/inputs/day1.input new file mode 100644 index 0000000..e1e570b --- /dev/null +++ b/inputs/day1.input 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28988 diff --git a/package.yaml b/package.yaml index 22a3da7..62a9fc4 100644 --- a/package.yaml +++ b/package.yaml @@ -12,6 +12,8 @@ dependencies: - matrix - vector - containers + - text + - scientific executables: aoc24: diff --git a/src/Day1.hs b/src/Day1.hs index 558c85f..45b80e9 100644 --- a/src/Day1.hs +++ b/src/Day1.hs @@ -2,7 +2,51 @@ module Day1 where +-- import Debug.Trace + +import qualified Data.Attoparsec.Text as P +import qualified Data.Text.IO as T +import Data.Scientific (coefficient) +import Data.List (sort) +import Data.Bifunctor (bimap) +import Data.Either (fromRight) + +parseInput :: P.Parser [(Integer,Integer)] +parseInput = parseLine `P.sepBy` P.endOfLine + +parseLine :: P.Parser (Integer,Integer) +parseLine = do + num1 <- coefficient <$> P.scientific + _ <- P.many1 P.space + num2 <- coefficient <$> P.scientific + pure (num1,num2) + +-- calculating distance +solveA :: [(Integer,Integer)] -> Integer +solveA = sum + . fmap (\(x,y) -> abs (y-x)) + . uncurry zip + . bimap sort sort + . unzip + +-- calculating similarity score +solveB :: [(Integer,Integer)] -> Integer +solveB xs = sum ys + where + ys = uncurry similarity $ unzip xs + similarity as bs = map go as + where + -- Find how many occurences n of a in bs + -- Return a*n + go :: Integer -> Integer + go a = a * toInteger (length (filter (== a) bs)) + main :: IO () main = do + _input <- T.readFile "inputs/day1-example.input" + input <- T.readFile "inputs/day1.input" putStrLn "Part 1" + let xs = fromRight [] $ P.parseOnly parseInput input + print $ solveA xs putStrLn "Part 2" + print $ solveB xs