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[haskell] Solve Day 3

main
Akshay Mankar 2023-12-03 21:24:32 +01:00
parent 8dad919572
commit b58db2d3c0
Signed by: axeman
GPG Key ID: CA08F3AB62369B89
8 changed files with 245 additions and 2 deletions
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4
answers.nix
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@ -7,4 +7,8 @@
part1 = "2406";
part2 = "78375";
};
day3 = {
part1 = "531932";
part2 = "73646890";
};
}

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default.nix Normal file
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2
haskell/aoc2023.cabal
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@ -19,8 +19,10 @@ library
default-language: GHC2021
build-depends: base ^>=4.17.2.0
, containers
, fingertree
exposed-modules: Day1
, Day2
, Day3
executable aoc2023
import: warnings

2
haskell/app/Main.hs
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@ -5,10 +5,12 @@ module Main where
import Day1 qualified
import Day2 qualified
import System.Environment (getArgs)
import qualified Day3
main :: IO ()
main = do
getArgs >>= \case
["day1"] -> Day1.run
["day2"] -> Day2.run
["day3"] -> Day3.run
args -> error $ "Invlaid args: " <> show args

4
haskell/default.nix
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@ -1,11 +1,11 @@
{ mkDerivation, base, containers, lib }:
{ mkDerivation, base, containers, fingertree, lib }:
mkDerivation {
pname = "aoc2023";
version = "0.1.0.0";
src = ./.;
isLibrary = true;
isExecutable = true;
libraryHaskellDepends = [ base containers ];
libraryHaskellDepends = [ base containers fingertree ];
executableHaskellDepends = [ base ];
homepage = "https://git.pub.solar/axeman/aoc2023";
description = "Advent of Code 2023";

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haskell/src/Day3.hs Normal file
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@ -0,0 +1,85 @@
module Day3 where
import Data.Char
import Data.Containers.ListUtils (nubOrd)
import Data.IntervalMap.FingerTree (Interval (..), IntervalMap)
import Data.IntervalMap.FingerTree qualified as IntervalMap
import Data.Map (Map)
import Data.Map.Lazy qualified as Map
import Data.Maybe (mapMaybe)
import Data.Set qualified as Set
run :: IO ()
run = do
(parts, numbers) <- readInput
putStrLn $ "Part 1 Answer: " <> show (part1 parts numbers)
putStrLn $ "Part 2 Answer: " <> show (part2 parts numbers)
part1 :: PartsMap -> NumbersMap -> Int
part1 parts numbers = do
let partCoords = Map.keysSet parts
potentialPartNumberCoords =
Set.unions $ Set.map (Set.fromList . neighbours) partCoords
partNumberWithCoords =
Set.unions $
Set.map
(\c -> Set.fromList $ IntervalMap.search c numbers)
potentialPartNumberCoords
partNumbers = map snd $ Set.toList partNumberWithCoords
sum partNumbers
neighbours :: Coord -> [Coord]
neighbours (x, y) =
[ (x1, y1)
| x1 <- [x - 1 .. x + 1],
y1 <- [y - 1 .. y + 1]
]
part2 :: PartsMap -> NumbersMap -> Int
part2 parts numbers =
let starPartCoords = Map.keys $ Map.filter (== '*') parts
gearRatios = mapMaybe (gearRatio numbers) starPartCoords
in sum gearRatios
gearRatio :: NumbersMap -> Coord -> Maybe Int
gearRatio numbers gearCoord =
let neighbourNums = nubOrd $ concatMap (\c -> nubOrd $ IntervalMap.search c numbers) (neighbours gearCoord)
in case neighbourNums of
[(_, n1), (_, n2)] -> Just (n1 * n2)
_ -> Nothing
type Coord = (Int, Int)
type PartsMap = Map Coord Char
type NumbersMap = IntervalMap Coord Int
readInput :: IO (PartsMap, NumbersMap)
readInput = do
ls <- lines <$> getContents
pure $ foldr parseLine (mempty, mempty) $ zip [0 ..] ls
parseLine :: (Int, String) -> (PartsMap, NumbersMap) -> (PartsMap, NumbersMap)
parseLine (x, line) (accParts, accNumbers) =
(parsePartsLine x line accParts, parseNumbersLine x line accNumbers)
parsePartsLine :: Int -> String -> PartsMap -> PartsMap
parsePartsLine x line acc =
let withIndices = zip [0 ..] line
parts = filter (\c -> snd c `notElem` "0123456789.\n") withIndices
partsWithX = map (\(y, c) -> ((x, y), c)) parts
in acc <> Map.fromList partsWithX
parseNumbersLine :: Int -> String -> NumbersMap -> NumbersMap
parseNumbersLine x = go 0 Nothing
where
go :: Int -> Maybe (Int, Int) -> [Char] -> NumbersMap -> NumbersMap
go _ Nothing [] m = m
go curY Nothing (c : rest) m
| isDigit c = go (curY + 1) (Just (curY, digitToInt c)) rest m
| otherwise = go (curY + 1) Nothing rest m
go curY (Just (startY, curNum)) [] m =
IntervalMap.insert (Interval (x, startY) (x, curY - 1)) curNum m
go curY (Just (startY, curNum)) (c : rest) m
| isDigit c = go (curY + 1) (Just (startY, curNum * 10 + digitToInt c)) rest m
| otherwise = go (curY + 1) Nothing rest $ IntervalMap.insert (Interval (x, startY) (x, curY - 1)) curNum m

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