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day 3

master
Thorn Avery 3 years ago
parent
d54a5d514d
commit
dd2bcc94a5
2 changed files with 363 additions and 0 deletions
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  1. +40
    -0
      day3.hs
  2. +323
    -0
      day3.txt

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day3.hs View File

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main :: IO ()
main = do
raw <- readFile "day3.txt"
let ls = map parse $ lines raw
ansA = solveSlope 3 1 ls
ansB = foldr (*) 1 $
[ (solveSlope 1 1 ls)
, (solveSlope 3 1 ls)
, (solveSlope 5 1 ls)
, (solveSlope 7 1 ls)
, (solveSlope 1 2 ls)
]
in do
putStrLn $ "day3a: " ++ (show ansA)
putStrLn $ "day3b: " ++ (show ansB)

parse :: String -> [Bool]
parse = map (== '#')

solveLine :: [Bool] -> Int -> Bool
solveLine [] _ = error "empty list"
solveLine bs i = bs !! index
where
index = i `mod` (length bs)

solveSlope :: Int -> Int -> [[Bool]] -> Int
solveSlope r d bs =
length $ filter (== True) $ solveSlope' r d bs 0 []

solveSlope' :: Int -> Int -> [[Bool]] -> Int -> [Bool] -> [Bool]
solveSlope' _ _ [] _ as = as
solveSlope' r d bs@(b:cs) i as =
if ns == []
then as
else solveSlope' r d ns ni $ (solveLine (head ns) ni) : as
where
ni = (i + r) `mod` (length b)
ns = if (length bs) <= d
then []
else (drop d bs)

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- 0
day3.txt View File

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..#..#......#..#.......#...#.#.
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