From 325e3fa7af74449bbdb2048f5e20684ba6019095 Mon Sep 17 00:00:00 2001
From: Yuchen Pei <me@ypei.me>
Date: Mon, 11 Dec 2017 15:32:00 +0100
Subject: finished day 11, finished day 10 part 1

---
 Puzzle11.hs | 43 +++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 43 insertions(+)
 create mode 100644 Puzzle11.hs

(limited to 'Puzzle11.hs')

diff --git a/Puzzle11.hs b/Puzzle11.hs
new file mode 100644
index 0000000..2bd6257
--- /dev/null
+++ b/Puzzle11.hs
@@ -0,0 +1,43 @@
+import Data.List.Split (splitOn)
+
+f :: [Char] -> (Int, Int)
+f "n" = (0, 1)
+f "ne" = (1, 1)
+f "se" = (1, 0)
+f "s" = (0, -1)
+f "sw" = (-1, -1)
+f "nw" = (-1, 0)
+
+plus :: (Int, Int) -> (Int, Int) -> (Int, Int)
+plus x1 x2 = (fst x1 + fst x2, snd x1 + snd x2)
+
+sum' :: [(Int, Int)] -> (Int, Int)
+sum' = foldl plus (0, 0)
+
+sums :: [(Int, Int)] -> [(Int, Int)]
+sums = scanl plus (0, 0)
+
+endPoint :: [[Char]] -> (Int, Int)
+endPoint xs = sum' $ f <$> xs
+
+dist2Origin :: (Int, Int) -> Int
+dist2Origin (x, y)
+ | signum x == signum y = min (abs x) (abs y) + abs (x - y)
+ | otherwise = abs x + abs y
+
+solve2' :: [[Char]] -> Int
+solve2' = maximum . (fmap dist2Origin) . sums . (fmap f)
+
+solve2 :: [Char] -> Int
+solve2 = solve2' . parseInput
+
+solve1' :: [[Char]] -> Int
+solve1' = dist2Origin . endPoint
+
+parseInput :: [Char] -> [[Char]]
+parseInput = splitOn ","
+
+solve1 :: [Char] -> Int
+solve1 = solve1' . parseInput
+
+input = 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-- 
cgit v1.2.3