From: Neil Smith Date: Thu, 8 Dec 2022 07:59:28 +0000 (+0000) Subject: Done day 8 X-Git-Url: https://git.njae.me.uk/?a=commitdiff_plain;h=19047d8d6b457c8cc47d61cc7694cdd120e38def;p=advent-of-code-22.git Done day 8 --- diff --git a/advent-of-code22.cabal b/advent-of-code22.cabal index 4ad8da0..0f7e6b5 100644 --- a/advent-of-code22.cabal +++ b/advent-of-code22.cabal @@ -136,3 +136,8 @@ executable advent07 import: common-extensions, build-directives main-is: advent07/Main.hs build-depends: text, attoparsec, containers, path-tree, rosezipper + +executable advent08 + import: common-extensions, build-directives + main-is: advent08/Main.hs + -- build-depends: text, attoparsec, containers, path-tree, rosezipper diff --git a/advent08/Main.hs b/advent08/Main.hs new file mode 100644 index 0000000..12f0b21 --- /dev/null +++ b/advent08/Main.hs @@ -0,0 +1,83 @@ +-- Writeup at https://work.njae.me.uk/2022/12/07/advent-of-code-2022-day-7/ + +import AoC +-- import Data.Char +import Data.List + + +data Tree = Tree Int Bool -- height, isVisible + deriving (Show, Eq) +type Forest = [[Tree]] + +main :: IO () +main = + do dataFileName <- getDataFileName + text <- readFile dataFileName + let forest = fmap (fmap readTree) $ lines text + -- print forest + -- print $ findVisibilityOrient forest + -- print $ findVisibilityForest forest + -- print $ countVisible $ findVisibilityForest forest + print $ part1 forest + print $ part2 forest + -- print $ part1 sizedTree + -- print $ part2 sizedTree + +part1 :: Forest -> Int +part1 = countVisible . findVisibilityForest +-- part1, part2 :: STree -> Integer +-- part1 = foldTree (\x xs -> sum (x:xs)) . fmap cancelLarge + +readTree :: Char -> Tree +readTree h = Tree (read [h]) False + +findVisibility :: [Tree] -> [Tree] +findVisibility row = snd $ foldl' vis (-1, []) row + where vis (highest, tagged) (Tree height visible) + | height > highest = (height, tagged ++ [Tree height True]) + | otherwise = (highest, tagged ++ [Tree height visible]) + +findVisibilityOrient :: Forest -> Forest +findVisibilityOrient = fmap findVisibility + +findVisibilityForest :: Forest -> Forest +findVisibilityForest forest = foldl' f forest [1..4] + where f trees _ = findVisibilityOrient (rotate trees) + rotate = (fmap reverse) . transpose + +countVisible :: Forest -> Int +countVisible forest = length $ filter isVisible $ foldl' (++) [] forest + +isVisible :: Tree -> Bool +isVisible (Tree _ v) = v + +treeHeight :: Tree -> Int +treeHeight (Tree h _) = h + +part2 :: Forest -> Int +part2 forest = maximum scores + where nrows = length forest + ncols = length $ head forest + scores = [scenicScore forest r c | r <- [0 .. (nrows - 1)], c <- [0 .. (ncols - 1)]] + +viewDistance :: Int -> [Tree] -> Int +viewDistance h trees = length $ takeUntil (< h) $ fmap treeHeight trees + +takeUntil :: (a -> Bool) -> [a] -> [a] +takeUntil f [] = [] +takeUntil f (x:xs) + | f x == True = x : (takeUntil f xs) + | otherwise = [x] + +tracks :: Forest -> Int -> Int -> [[Tree]] +tracks forest row col = [reverse l, drop 1 r, reverse u, drop 1 d] + where (l, r) = splitAt col (forest !! row) + -- r = drop 1 r' + (u, d) = splitAt row ((transpose forest) !! col) + -- d = drop 1 d' + +scenicScore :: Forest -> Int -> Int -> Int +scenicScore forest row col = foldl' (*) 1 $ fmap (viewDistance h) directions + where directions = tracks forest row col + h = treeHeight $ (forest!!row)!!col + diff --git a/data/advent08.txt b/data/advent08.txt new file mode 100644 index 0000000..d27a06c --- /dev/null +++ b/data/advent08.txt @@ -0,0 +1,99 @@ +202210010310302121322210423201220000314024242432211425434422230130411300321324302223011311211020120 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