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--- /dev/null
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--- /dev/null
+.#.#.#....
+.......###
+######.#.#
+#.........
+..##.#.#.#
+.###.#.#..
+.#...#.#.#
+####.#####
+#.#.....#.
+....#.#...
\ No newline at end of file
--- /dev/null
+{-# LANGUAGE OverloadedStrings #-}
+
+import Data.List
+import Data.Function (on)
+
+import Data.Text (Text)
+import qualified Data.Text.IO as TIO
+
+import Data.Void (Void)
+
+import Text.Megaparsec
+import Text.Megaparsec.Char
+import qualified Text.Megaparsec.Char.Lexer as L
+import qualified Control.Applicative as CA
+
+type Burgers = [Int]
+type Flips = [Int]
+type Flipper = (Int, Flips)
+
+main :: IO ()
+main = do
+ flipsT <- TIO.readFile "data/07-flips.txt"
+ let (burgers, flippers) = successfulParse flipsT
+ print $ part1 burgers flippers
+ print $ part2 burgers flippers
+
+
+part1 :: Burgers -> [Flipper] -> Int
+part1 burgers = length . filter isSorted . map (enflip burgers) . map snd
+ where isSorted items = items == unburntSort items
+
+part2 :: Burgers -> [Flipper] -> Int
+part2 burgers = fst . head . filter isSorted . map (\(n, fs) -> (n, enflip burgers fs))
+ where isSorted (_, items) = (null $ filter (<= 0) items) && (items == sort items)
+
+
+enflip :: Burgers -> Flips -> Burgers
+enflip = foldl' oneFlip
+ where oneFlip items pos = [-1 * i | i <- (reverse $ take pos items)] ++ (drop pos items)
+
+unburntSort :: Burgers -> Burgers
+unburntSort = sortBy (compare `on` abs)
+
+
+-- Parse the input file
+
+type Parser = Parsec Void Text
+
+-- don't treat newlines as automatically-consumed whitespace
+sc :: Parser ()
+sc = L.space (skipSome (char ' ')) CA.empty CA.empty
+
+lexeme = L.lexeme sc
+integer = lexeme L.decimal
+symb = L.symbol sc
+
+flipsFileP = (,) <$> burgersP <* newline <*> (flipperP `endBy` newline)
+
+burgersP = (:) <$> symb "burgers:" *> many integer
+
+flipperP = (,) <$> integer <* symb ":" <*> many integer
+
+successfulParse :: Text -> (Burgers, [Flipper])
+successfulParse input =
+ case parse flipsFileP "input" input of
+ Left _error -> ([], []) -- TIO.putStr $ T.pack $ parseErrorPretty err
+ Right flips -> flips
\ No newline at end of file
--- /dev/null
+{
+ "cells": [
+ {
+ "cell_type": "code",
+ "execution_count": 10,
+ "metadata": {},
+ "outputs": [],
+ "source": [
+ "def enflip(items, flips, burnt=False, debug=False):\n",
+ " if debug: i0 = items\n",
+ " for flip in flips:\n",
+ " if burnt:\n",
+ " items = [-i for i in reversed(items[:flip])] + items[flip:]\n",
+ " else:\n",
+ " items = [i for i in reversed(items[:flip])] + items[flip:]\n",
+ " if debug: print('{} -{}-> {}'.format(i0, flip, items))\n",
+ " if debug: i0 = items\n",
+ " return items"
+ ]
+ },
+ {
+ "cell_type": "code",
+ "execution_count": 11,
+ "metadata": {},
+ "outputs": [],
+ "source": [
+ "def burnt_sorted(pancakes):\n",
+ " return pancakes == sorted(pancakes)\n",
+ "\n",
+ "def unburnt_sorted(pancakes):\n",
+ " simple_pancakes = [abs(p) for p in pancakes]\n",
+ " return simple_pancakes == sorted(simple_pancakes)"
+ ]
+ },
+ {
+ "cell_type": "code",
+ "execution_count": 12,
+ "metadata": {},
+ "outputs": [],
+ "source": [
+ "flips_t = [l.strip().split(': ') for l in open('../../data/07-flips.txt')]"
+ ]
+ },
+ {
+ "cell_type": "code",
+ "execution_count": 13,
+ "metadata": {},
+ "outputs": [],
+ "source": [
+ "stack = [[int(p) for p in l.split()] for c, l in flips_t if c == 'burgers'][0]\n",
+ "flips = {int(c): [int(p) for p in l.split()] for c, l in flips_t if c != 'burgers'}"
+ ]
+ },
+ {
+ "cell_type": "code",
+ "execution_count": 14,
+ "metadata": {},
+ "outputs": [
+ {
+ "data": {
+ "text/plain": [
+ "69"
+ ]
+ },
+ "execution_count": 14,
+ "metadata": {},
+ "output_type": "execute_result"
+ }
+ ],
+ "source": [
+ "sum(1 for f in flips.values()\n",
+ " if unburnt_sorted(enflip(stack, f)))"
+ ]
+ },
+ {
+ "cell_type": "code",
+ "execution_count": 15,
+ "metadata": {},
+ "outputs": [
+ {
+ "data": {
+ "text/plain": [
+ "92"
+ ]
+ },
+ "execution_count": 15,
+ "metadata": {},
+ "output_type": "execute_result"
+ }
+ ],
+ "source": [
+ "[f for f in flips\n",
+ " if burnt_sorted(enflip(stack, flips[f], burnt=True))][0]"
+ ]
+ },
+ {
+ "cell_type": "code",
+ "execution_count": null,
+ "metadata": {},
+ "outputs": [],
+ "source": []
+ }
+ ],
+ "metadata": {
+ "kernelspec": {
+ "display_name": "Python 3",
+ "language": "python",
+ "name": "python3"
+ },
+ "language_info": {
+ "codemirror_mode": {
+ "name": "ipython",
+ "version": 3
+ },
+ "file_extension": ".py",
+ "mimetype": "text/x-python",
+ "name": "python",
+ "nbconvert_exporter": "python",
+ "pygments_lexer": "ipython3",
+ "version": "3.6.6"
+ }
+ },
+ "nbformat": 4,
+ "nbformat_minor": 2
+}
--- /dev/null
+import Data.Maybe (fromMaybe)
+import qualified Data.PQueue.Prio.Min as P
+import qualified Data.HashSet as S
+import qualified Data.Sequence as Q
+import qualified Data.HashMap.Strict as M
+import Data.Sequence ((<|))
+import Data.Foldable (foldl')
+import Data.HashMap.Strict ((!))
+
+
+data Grass = Short | Long deriving (Show, Eq)
+type Location = (Int, Int)
+data Neighbour = Neighbour {stepLocation :: Location, stepCost :: Int} deriving (Show, Eq)
+type Lawn = M.HashMap Location Grass
+type Closed = S.HashSet Location
+data Agendum = Agendum {current :: Location, trail :: Q.Seq Location, cost :: Int} deriving (Show, Eq)
+type Agenda = P.MinPQueue Int Agendum
+
+
+main :: IO ()
+main = do
+ lawnT <- readFile "data/08-maze.txt"
+ let lawn = parseLawn lawnT
+ let goal = goalLocation lawn
+ print $ part1 lawn goal
+ print $ part2 lawn goal
+
+part1 :: Lawn -> Location -> Int
+part1 lawn goal = cost $ fromMaybe (snd $ P.findMin $ initAgenda goal) $ aStar 999 goal lawn (initAgenda goal) S.empty
+
+part2 :: Lawn -> Location -> Int
+part2 lawn goal = cost $ fromMaybe (snd $ P.findMin $ initAgenda goal) $ aStar 3 goal lawn (initAgenda goal) S.empty
+
+
+parseLawn :: String -> Lawn
+parseLawn lawnT = M.fromList lawnCells
+ where lawnLines = zip [1..] $ lines lawnT
+ lawnCells = concatMap (\(r, row) -> zipWith (cellify r) [1..] row) lawnLines
+ cellify r c cell
+ | cell == '#' = ((r, c), Long)
+ | otherwise = ((r, c), Short)
+
+goalLocation :: Lawn -> Location
+goalLocation lawn = ( maximum $ map fst $ M.keys lawn
+ , maximum $ map snd $ M.keys lawn
+ )
+
+initAgenda :: Location -> Agenda
+initAgenda goal = P.singleton (estimateCost (1, 1) goal) Agendum {current = (1, 1), trail = Q.empty, cost = 0}
+
+
+aStar :: Int -> Location -> Lawn -> Agenda -> Closed -> Maybe Agendum
+aStar longCost goal lawn agenda closed
+ -- | trace ("Peeping " ++ (show $ fst $ P.findMin agenda) ++ ": " ++ (show reached) ++ " <- " ++ (show $ toList $ Q.take 1 $ trail $ currentAgendum) ++ " :: " ++ (show newAgenda)) False = undefined
+ | P.null agenda = Nothing
+ | otherwise =
+ if reached == goal then Just currentAgendum
+ else if reached `S.member` closed
+ then aStar longCost goal lawn (P.deleteMin agenda) closed
+ else aStar longCost goal lawn newAgenda (S.insert reached closed)
+ where
+ (_, currentAgendum) = P.findMin agenda
+ reached = current currentAgendum
+ newAgenda = foldl' (\q a -> P.insert (estimatedCost a) a q) (P.deleteMin agenda) $ candidates longCost lawn currentAgendum closed
+ estimatedCost agendum = estimateCost (current agendum) goal + cost agendum
+
+
+
+candidates :: Int -> Lawn -> Agendum -> Closed -> Q.Seq Agendum
+candidates longCost lawn agendum closed = newCandidates
+ where
+ candidate = current agendum
+ previous = trail agendum
+ succs = successors longCost lawn candidate
+ nonloops = Q.filter (\s -> not $ (stepLocation s) `S.member` closed) succs
+ newCandidates = fmap (\n -> makeAgendum n) nonloops
+ makeAgendum new = Agendum {current = stepLocation new,
+ trail = candidate <| previous,
+ cost = cost agendum + stepCost new}
+
+
+successors :: Int -> Lawn -> Location -> (Q.Seq Neighbour)
+successors longCost lawn (row, column) = Q.fromList $ map neighbourify neighbours
+ where neighbours = filter (\l -> l `M.member` lawn)
+ [(r, c) | r <- [(row - 1)..(row + 1)],
+ c <- [(column - 1)..(column + 1)],
+ r >= minR,
+ r <= maxR,
+ c >= minC,
+ c <= maxC,
+ ((r == row && c /= column) || (r /= row && c == column)) ]
+ neighbourify neighbour = Neighbour {stepLocation = neighbour, stepCost = scCalc neighbour}
+ minR = minimum $ map fst $ M.keys lawn
+ maxR = maximum $ map fst $ M.keys lawn
+ minC = minimum $ map snd $ M.keys lawn
+ maxC = maximum $ map snd $ M.keys lawn
+ scCalc location = if lawn!location == Long
+ then longCost
+ else 1
+
+
+estimateCost :: Location -> Location -> Int
+estimateCost (r, c) (gr, gc) = abs (r - gr) + abs(c - gc)
+
build-depends: base >= 4.7 && < 5
, text
, unordered-containers
-
\ No newline at end of file
+
+executable task7
+ hs-source-dirs: src/task7
+ main-is: task7.hs
+ default-language: Haskell2010
+ build-depends: base >= 4.7 && < 5
+ , text
+ , megaparsec
+
+executable task8
+ hs-source-dirs: src/task8
+ main-is: task8.hs
+ default-language: Haskell2010
+ build-depends: base >= 4.7 && < 5
+ , pqueue
+ , hashable
+ , containers
+ , unordered-containers
+
\ No newline at end of file
projects / summerofcode2018soln.git / commitdiff