Add 2020 day 11

This commit is contained in:
Xavier Morel
2020-12-11 11:14:19 +01:00
parent 010cf614a5
commit 6f1955b070
4 changed files with 166 additions and 0 deletions

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@@ -23,6 +23,7 @@ dependencies:
- base >= 4.7 && < 5
- containers
- directory
- matrix
- memoize
- pureMD5
- sort

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module Y2020.Day11 (y20day11) where
import Data.Matrix
type Setting = Matrix Char
empty :: Char
empty = 'L'
occupied :: Char
occupied = '#'
directions :: [(Int, Int)]
directions = [(-1, -1), (0, -1), (1, -1),
(-1, 0), (1, 0),
(-1, 1), (0, 1), (1, 1)]
countOccupiedSeatsP1 :: Setting -> (Int, Int) -> Int
countOccupiedSeatsP1 old (x, y) = length $ filter (== occupied) $ map ((!) old) $ filter validPos $ adjacentSeats
where adjacentSeats = map (\(dx, dy) -> (x + dx, y + dy)) $ directions
validPos (x', y') = x' >= 1 && y' >= 1 && x' <= (ncols old) && y' <= (nrows old)
countOccupiedSeatsP2 :: Setting -> (Int, Int) -> Int
countOccupiedSeatsP2 old p = length $ filter (== occupied) $ map (getFirstSeat p) $ directions
where validPos (x, y) = x >= 1 && y >= 1 && x <= (ncols old) && y <= (nrows old)
getFirstSeat (x, y) (dx, dy)
| not $ validPos (x', y') = '.'
| inSight == '.' = getFirstSeat (x', y') (dx, dy)
| otherwise = inSight
where x' = x + dx
y' = y + dy
inSight = old ! (x', y')
generatorFunc :: Int -> Setting -> (Int, Int) -> Char
generatorFunc part old p
| oldPos == empty && (occupiedSeats part) == 0 = occupied
| oldPos == occupied && (occupiedSeats part) >= (occupiedThreshold part) = empty
| otherwise = oldPos
where oldPos = old ! p
occupiedSeats 1 = countOccupiedSeatsP1 old p
occupiedSeats 2 = countOccupiedSeatsP2 old p
occupiedThreshold 1 = 4
occupiedThreshold 2 = 5
nextSetting :: Int -> Setting -> Setting
nextSetting part setting = matrix cols rows $ generatorFunc part setting
where cols = ncols setting
rows = nrows setting
hasChanged :: Setting -> Setting -> Bool
hasChanged previous current = previous /= current
getStabilizedSetting :: Int -> Setting -> Setting
getStabilizedSetting part setting
| nextHasChanged == True = getStabilizedSetting part next
| otherwise = setting
where next = nextSetting part setting
nextHasChanged = hasChanged setting next
y20day11 :: [String] -> (String, String)
y20day11 input = (part1, part2)
where part1 = show $ countOccupied $ getStabilizedSetting 1 input'
part2 = show $ countOccupied $ getStabilizedSetting 2 input'
input' = fromLists input
countOccupied mat = length $ filter (== occupied) $ toList mat

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@@ -10,6 +10,7 @@ import Y2020.Day07
import Y2020.Day08
import Y2020.Day09
import Y2020.Day10
import Y2020.Day11
year2020 :: String -> [String] -> (String, String)
year2020 "01" = y20day01
@@ -22,3 +23,4 @@ year2020 "07" = y20day07
year2020 "08" = y20day08
year2020 "09" = y20day09
year2020 "10" = y20day10
year2020 "11" = y20day11