From 9228bbabbd79f83d99dd8d15a4c3b89a789bdc72 Mon Sep 17 00:00:00 2001 From: Stephan Stanisic Date: Thu, 8 Dec 2022 22:04:08 +0100 Subject: [PATCH] Day 8! Took me longer than I'd like to admit --- 2022/aoc2022.cabal | 2 +- 2022/app/Day8/Main.hs | 59 ++++++++++++++++++++++++++ 2022/app/Day8/example | 5 +++ 2022/app/Day8/input | 99 +++++++++++++++++++++++++++++++++++++++++++ 2022/app/Main.hs | 2 + 5 files changed, 166 insertions(+), 1 deletion(-) create mode 100644 2022/app/Day8/Main.hs create mode 100644 2022/app/Day8/example create mode 100644 2022/app/Day8/input diff --git a/2022/aoc2022.cabal b/2022/aoc2022.cabal index 8ebb1c9..947b910 100644 --- a/2022/aoc2022.cabal +++ b/2022/aoc2022.cabal @@ -9,4 +9,4 @@ executable aoc2022 build-depends: base ^>=4.16.2.0, split ^>=0.2.3.5, regex-tdfa ^>=1.3.2, containers ^>=0.6.6 hs-source-dirs: app default-language: Haskell2010 - other-modules: Day1.Main Day2.Main Day3.Main Day4.Main Day5.Main Day6.Main Day7.Main + other-modules: Day1.Main Day2.Main Day3.Main Day4.Main Day5.Main Day6.Main Day7.Main, Day8.Main diff --git a/2022/app/Day8/Main.hs b/2022/app/Day8/Main.hs new file mode 100644 index 0000000..ff8295b --- /dev/null +++ b/2022/app/Day8/Main.hs @@ -0,0 +1,59 @@ +module Day8.Main where + +import System.IO +import Data.List + +main :: IO () +main = do + putStrLn "Day 8" + + handle <- openFile "app/Day8/input" ReadMode + contents <- hGetContents handle + + let r1 = part1 contents + putStrLn $ "part 1: " ++ show r1 + + let r2 = part2 contents + putStrLn $ "part 2: " ++ show r2 + +type Tree = (Int,[Int],[Int],[Int],[Int]) -- Self, N, E, S, W + +enumerate :: [a] -> [(Int, a)] +enumerate = zip [0..] + +parseData :: String -> [[Int]] +parseData contents = (map . map) (read . singleton :: Char -> Int) $ lines contents + +toTrees :: [[Int]] -> [Tree] +toTrees rows = [(tree, north r c, east r c, south r c, west r c) | (r, line) <- enumerate rows, (c, tree) <- enumerate line] + where + columns = transpose rows + east r c = drop (c + 1) $ rows !! r + west r c = reverse $ take c $ rows !! r + north r c = reverse $ take r $ columns !! c + south r c = drop (r + 1) $ columns !! c + +isVisible :: Int -> [Int] -> Bool +isVisible _ [] = True +isVisible t ts = all (< t) ts + +invisibleFromOutside :: Tree -> Bool +invisibleFromOutside (t,n,e,s,w) = all (not . isVisible t) [n,e,s,w] + +part1 :: String -> Int +part1 = length . filter (not . invisibleFromOutside) . toTrees . parseData + +-- Includive version of takeWhile (because lentgh takeWhile + 1 doesn't work for when the outer border is the reason you can't see further) +takeWhileI :: (a -> Bool) -> [a] -> [a] +takeWhileI _ [] = [] +takeWhileI p (x:xs) = + x : if p x then takeWhileI p xs else [] + +viewingDistance :: Int -> [Int] -> Int +viewingDistance t ts = length $ takeWhileI (< t) ts + +scenicScore :: Tree -> Int +scenicScore (t,n,e,s,w) = product $ map (viewingDistance t) [n,e,s,w] + +part2 :: String -> Int +part2 = maximum . map scenicScore . toTrees . parseData diff --git a/2022/app/Day8/example b/2022/app/Day8/example new file mode 100644 index 0000000..16d6fbd --- /dev/null +++ b/2022/app/Day8/example @@ -0,0 +1,5 @@ +30373 +25512 +65332 +33549 +35390 diff --git a/2022/app/Day8/input b/2022/app/Day8/input new file mode 100644 index 0000000..ffdd5b1 --- /dev/null +++ b/2022/app/Day8/input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