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{-
Copyright (C) 2017 Yuchen Pei.
This program is free software: you can redistribute it and/or modify
it under the terms of the GNU Affero General Public License as
published by the Free Software Foundation, either version 3 of the
License, or (at your option) any later version.
This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU Affero General Public
License along with this program. If not, see
<https://www.gnu.org/licenses/>.
-}
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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