wip: day 11

2020/11/Day11.hs

@@ -0,0 +1,74 @@
+module Day11 where
+
+import Data.Array
+
+data Cell = Empty | Occupied | Floor
+  deriving (Eq, Show)
+
+isCell 'L' = True
+isCell '#' = True
+isCell '.' = True
+isCell _ = False
+
+toCell 'L' = Empty
+toCell '#' = Occupied
+toCell '.' = Floor
+
+instance Read Cell where
+  readsPrec _ (c:rest) = [(toCell c, rest)]
+  readList input = [(map toCell cells, rest)]
+    where (cells, rest) = span isCell input
+
+toChar Empty = 'L'
+toChar Occupied = '#'
+toChar Floor = '.'
+
+type State = Array (Int, Int) Cell
+
+parse :: String -> State
+parse input = listArray ((1, 1), (width, height)) $ concat lists
+  where
+    lists :: [[Cell]]
+    lists = map read $ lines input
+    width = length $ head lists
+    height = length lists
+
+render :: State -> String
+render state = unlines chunks
+  where
+    (_, (width, _)) = bounds state
+    chars = map toChar $ elems state
+    chunks = chunk width chars
+
+
+chunk n [] = []
+chunk n xs = curr:(chunk n rest)
+  where
+    (curr, rest) = splitAt n xs
+
+n (x, y) = (x, y-1)
+s (x, y) = (x, y+1)
+w (x, y) = (x-1, y)
+e (x, y) = (x+1, y)
+ne = n . e
+nw = n . w
+se = s . e
+sw = s . w
+
+directions x = map ($ x) [n, ne, e, se, s, sw, w, nw]
+
+(!?) arr ix =
+  if inRange (bounds arr) ix
+     then Just (arr ! ix)
+     else Nothing
+
+tick :: State -> State
+tick curr = array (bounds curr) $ map nextCell $ assocs curr
+  where
+    occupiedAdjacent ix =
+      length $ filter (== (Just Occupied)) $ map ((!?) curr) $ directions ix
+    nextCell c@(ix, Empty)
+      | occupiedAdjacent ix == 0 = (ix, Occupied)
+    nextCell c@(ix, Occupied)
+      | occupiedAdjacent ix >= 4 = (ix, Empty)
+    nextCell x = x

2020/11/Part1.hs

@@ -0,0 +1,16 @@
+#!/usr/bin/env runghc
+module Day11.Part1 where
+
+import Day11
+import Data.List (find)
+import Data.Array (elems)
+
+main = interact (show . solve . parse)
+
+-- unlines $ map (render . snd) $ takeWhile (not . isUnchanged) ticks
+solve start = length $ filter (== Occupied) $ elems stasis
+  where
+    simulation = iterate tick start
+    ticks = zip simulation (tail simulation)
+    isUnchanged = uncurry (==)
+    (Just (stasis, _)) = find isUnchanged ticks

2020/11/input.txt

@@ -0,0 +1,93 @@
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2020/11/small.txt

@@ -0,0 +1,10 @@
+L.LL.LL.LL
+LLLLLLL.LL
+L.L.L..L..
+LLLL.LL.LL
+L.LL.LL.LL
+L.LLLLL.LL
+..L.L.....
+LLLLLLLLLL
+L.LLLLLL.L
+L.LLLLL.LL

2020/README.md

@@ -13,9 +13,9 @@ asdf install
 ## Table of Contents
 
 |  S  |  M  |  T  |  W  |  T   |  F   |  S  |
-| :-: | :-: | :-: | :-: | :--: | :-: | :-: |
+| :-: | :-: | :-: | :-: | :--: | :--: | :-: |
 |     |     | [1] | [2] | [3]  | [4]  | [5] |
-| [6] | [7] | [8] | [9] | [10] | 11  | 12  |
+| [6] | [7] | [8] | [9] | [10] | [11] | 12  |
 | 13  | 14  | 15  | 16  |  17  |  18  | 19  |
 | 21  | 22  | 23  | 24  |  25  |      |     |
 
@@ -31,3 +31,4 @@ asdf install
 [8]: ./08
 [9]: ./09
 [10]: ./10
+[11]: ./11