From 9834a8f0d845bcde04e3f9b9248a9bf02c17281d Mon Sep 17 00:00:00 2001 From: tomsmeding Date: Tue, 19 Dec 2017 10:11:10 +0100 Subject: Day 19 --- 2017/19.hs | 73 ++++++++++++++++++++++ 2017/19.in | 201 +++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++ 2 files changed, 274 insertions(+) create mode 100644 2017/19.hs create mode 100644 2017/19.in diff --git a/2017/19.hs b/2017/19.hs new file mode 100644 index 0000000..d6b2d47 --- /dev/null +++ b/2017/19.hs @@ -0,0 +1,73 @@ +import Prelude hiding (Right, Left, flip) +import Control.Monad +import Data.Array.Unboxed +import Data.Char + + +type Idx = (Int, Int) +type Chart = UArray Idx Char +data Dir = Up | Right | Down | Left + deriving (Show, Eq) + +add :: Idx -> Dir -> Idx +add (y, x) dir = case dir of + Up -> (y - 1, x) + Right -> (y, x + 1) + Down -> (y + 1, x) + Left -> (y, x - 1) + +flip :: Dir -> Dir +flip Down = Up +flip Up = Down +flip Right = Left +flip Left = Right + +corresponds :: Char -> Dir -> Bool +corresponds '|' dir = dir `elem` [Down, Up] +corresponds '-' dir = dir `elem` [Right, Left] +corresponds '+' _ = True +corresponds c _ | isAlpha c = True +corresponds ' ' _ = False +corresponds c d = error ("corresponds: " ++ show c ++ " " ++ show d) + +steer :: Chart -> Idx -> Char -> Dir -> Dir +steer _ _ '|' Down = Down +steer _ _ '|' Up = Up +steer _ _ '|' dir = dir +steer _ _ '-' Right = Right +steer _ _ '-' Left = Left +steer _ _ '-' dir = dir +steer chart idx '+' dir = + let [newdir] = [dir' | dir' <- [Up, Right, Down, Left], + dir' /= flip dir, + corresponds (chart ! add idx dir') dir'] + in newdir +steer _ idx ' ' dir = error ("Went into spaces with direction " ++ show dir ++ " at " ++ show idx) + +follow :: Chart -> Idx -> Dir -> ([Char], Int) +follow chart idx dir = + if isAlpha (chart ! idx) + then if chart ! add idx dir == ' ' + then ([chart ! idx], 1) + else let (str, count) = follow chart (add idx dir) dir + in (chart ! idx : str, count + 1) + else let newdir = steer chart idx (chart ! idx) dir + in fmap succ $ follow chart (add idx newdir) newdir + +findStart :: Chart -> Idx +findStart chart = + let ((0, 0), (_, w')) = bounds chart + [x] = [i | i <- [0..w'], chart ! (0, i) /= ' '] + in (0, x) + +main :: IO () +main = do + input <- (readFile "19.in") + let w = length (head (lines input)) + h = length (lines input) + chart = listArray ((0, 0), (h-1, w-1)) (filter (/= '\n') input) + + let start = findStart chart + (str, count) = follow chart start Down + putStrLn str + print count diff --git a/2017/19.in b/2017/19.in new file mode 100644 index 0000000..18567e4 --- /dev/null +++ b/2017/19.in @@ -0,0 +1,201 @@ + | + +-------------------+ +-+ +-------+ +-------------------+ | +---+ +-----+ +---+ + | | | | | | | | | | | | | | | + | +---+ | +---------------|-------|-----------------------+ +-----------------------------+ | | | | | | + | | | | | | | | | | | | | | | | | | | | | + | | +---------------------|-----------------------------------|-------------------------------------------------------------------|-----------------+ +-----------------------+ | + | | | | | | | | | | | | | | | | | | | | | + | | | 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