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Added writeup links
[advent-of-code-21.git]
/
advent01
/
Main.hs
diff --git
a/advent01/Main.hs
b/advent01/Main.hs
index 535fdf45410bf4884cc4103e426c6e25c079b69a..8c95a92d4c83caa89d16d5d2a4581a180e1bb488 100644
(file)
--- a/
advent01/Main.hs
+++ b/
advent01/Main.hs
@@
-1,3
+1,5
@@
+-- Writeup at https://work.njae.me.uk/2021/12/01/advent-of-code-2021-day-1/
+
import Data.List
main :: IO ()
import Data.List
main :: IO ()
@@
-12,7
+14,7
@@
part1 = countIncreasing
part2 :: [Int] -> Int
part2 nums = countIncreasing $ map sum windows
part2 :: [Int] -> Int
part2 nums = countIncreasing $ map sum windows
- where windows = filter (
\w -> length w == 3
) $ map (take 3) $ tails nums
+ where windows = filter (
(== 3) . length
) $ map (take 3) $ tails nums
countIncreasing :: [Int] -> Int
countIncreasing :: [Int] -> Int
-countIncreasing nums = length $ filter (
> 0) $ zipWith (-)
(tail nums) nums
+countIncreasing nums = length $ filter (
uncurry (>)) $ zip
(tail nums) nums