X-Git-Url: https://git.njae.me.uk/?a=blobdiff_plain;f=advent01%2FMain.hs;h=8c95a92d4c83caa89d16d5d2a4581a180e1bb488;hb=6f75b7d1d52146a5acf6aab7cfc4d8388b91fc3d;hp=9d627260e2887769b4e74d8f7546fcc94bac9b25;hpb=a2a16b80400775f291b74d4923a00949fb1b70f1;p=advent-of-code-21.git

diff --git a/advent01/Main.hs b/advent01/Main.hs
index 9d62726..8c95a92 100644
--- 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 ()
@@ -15,4 +17,4 @@ part2 nums = countIncreasing $ map sum windows
   where windows = filter ((== 3) . length) $ map (take 3) $ tails nums
 
 countIncreasing :: [Int] -> Int
-countIncreasing nums = length $ filter (> 0) $ zipWith (-) (tail nums) nums
+countIncreasing nums = length $ filter (uncurry (>)) $ zip (tail nums) nums