From 72541fd746edaa71045251c0c6087c8ff75b8747 Mon Sep 17 00:00:00 2001 From: Zach Perrault <zach@perrault.email> Date: Fri, 11 Dec 2020 15:40:23 -0500 Subject: [PATCH] wip: day 11 --- 2020/11/Day11.hs | 74 +++++++++++++++++++++++++++++++++++++ 2020/11/Part1.hs | 16 ++++++++ 2020/11/input.txt | 93 +++++++++++++++++++++++++++++++++++++++++++++++ 2020/11/small.txt | 10 +++++ 2020/README.md | 13 ++++--- 5 files changed, 200 insertions(+), 6 deletions(-) create mode 100644 2020/11/Day11.hs create mode 100755 2020/11/Part1.hs create mode 100644 2020/11/input.txt create mode 100644 2020/11/small.txt diff --git a/2020/11/Day11.hs b/2020/11/Day11.hs new file mode 100644 index 0000000..f89deb4 --- /dev/null +++ b/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 diff --git a/2020/11/Part1.hs b/2020/11/Part1.hs new file mode 100755 index 0000000..2b45802 --- /dev/null +++ b/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 diff --git a/2020/11/input.txt 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:-: | :-: | :-: | :-: | :--: | :-: | :-: | -| | | [1] | [2] | [3] | [4] | [5] | -| [6] | [7] | [8] | [9] | [10] | 11 | 12 | -| 13 | 14 | 15 | 16 | 17 | 18 | 19 | -| 21 | 22 | 23 | 24 | 25 | | | +| S | M | T | W | T | F | S | +| :-: | :-: | :-: | :-: | :--: | :--: | :-: | +| | | [1] | [2] | [3] | [4] | [5] | +| [6] | [7] | [8] | [9] | [10] | [11] | 12 | +| 13 | 14 | 15 | 16 | 17 | 18 | 19 | +| 21 | 22 | 23 | 24 | 25 | | | [asdf]: https://asdf-vm.com/#/ [haskell]: https://www.haskell.org @@ -31,3 +31,4 @@ asdf install [8]: ./08 [9]: ./09 [10]: ./10 +[11]: ./11