From b2542fa25011f265c4bfcdb2a57d408cf3fa80aa Mon Sep 17 00:00:00 2001
From: shu <shu@lain.localdomain>
Date: Sat, 14 Dec 2019 15:56:18 +0100
Subject: [PATCH] Day 10: Minor cleanup

Still not pretty but at least nothing glaring
---
 2019/day10/day10.hs | 50 +++++++++++----------------------------------
 1 file changed, 12 insertions(+), 38 deletions(-)

diff --git a/2019/day10/day10.hs b/2019/day10/day10.hs
index 1f4ea5d..5e986b5 100644
--- a/2019/day10/day10.hs
+++ b/2019/day10/day10.hs
@@ -1,42 +1,26 @@
-{-# LANGUAGE LambdaCase #-}
-{-# LANGUAGE BangPatterns #-}
-{-# LANGUAGE ParallelListComp #-}
-
 import Data.List as L
 import Data.Maybe
 import Data.Ord
-import Data.Ratio
 import qualified Data.Vector as V
 
-type Asteroid_old = (Int, Int)
-
 data Asteroid =
   Asteroid Int Int
   deriving (Show)
 
 instance Eq Asteroid where
-  Asteroid a b == Asteroid c d = reduce a b == reduce c d
-    where
-      reduce x y
-        | y == 0 && x == 0 = (0, 0)
-        | x == 0 = (0, signum y)
-        | y == 0 = (signum x, 0)
-        | otherwise =
-          (signum x * (abs $numerator z), signum y * (abs $denominator z))
-        where
-          z = x %y
+  Asteroid a b == Asteroid c d = phi' a b == phi' c d
 
 instance Ord Asteroid where
-  Asteroid a b `compare` Asteroid c d = (phi a b) `compare` (phi c d)
+  Asteroid a b `compare` Asteroid c d = phi a b `compare` phi c d
     where
       phi x y = phi' (fromIntegral x) (fromIntegral y)
-      phi' :: Double -> Double -> Double
-      phi' x y
-        | x >= 0 = atan2 x (-y)
-        | otherwise = 2 * pi + atan2 (-x) y
 
-(+|) :: Asteroid -> Asteroid -> Asteroid
-(+|) (Asteroid a b) (Asteroid c d) = Asteroid (a + c) (b + d)
+phi' :: Int -> Int -> Double
+phi' xi yi
+ | x >= 0 = atan2 x (-y)
+ | otherwise = 2 * pi + atan2 (-x) y
+    where x = fromIntegral xi
+          y = fromIntegral yi
 
 (-|) :: Asteroid -> Asteroid -> Asteroid
 (-|) (Asteroid a b) (Asteroid c d) = Asteroid (a - c) (b - d)
@@ -47,11 +31,11 @@ neg (Asteroid a b) = Asteroid (-a) (-b)
 dist :: Asteroid -> Int
 dist (Asteroid x y) = abs x + abs y
 
+main :: IO ()
 main = do
   content <- lines <$> readFile "input"
-  print $ parse content
-  let aMax = fst $ maxInSight $ parse content
-  print aMax
+  let (aMax,sMax) = maxInSight $ parse content
+  print sMax
   let newlist =
         listCycle $
         sort $
@@ -84,14 +68,4 @@ maxInSight :: [Maybe Asteroid] -> (Asteroid, Int)
 maxInSight xs =
   maximumBy (comparing snd) $ map (f . transformCoordinates xs) (catMaybes xs)
   where
-    f (x, y) = (x, pred . length . nub $ y)
-
-asts :: [String] -> [Maybe Asteroid_old]
-asts xxs =
-  L.nub
-    [ if (xxs !! y) !! (x) == '.'
-      then Nothing
-      else Just (x, y)
-    | y <- [0 .. (L.length $ L.head xxs) - 1]
-    , x <- [0 .. L.length xxs - 1]
-    ]
+    f (x, y) = (x, length . nub $ y)