From ba7f08b6ca184b78f97bf30b8a0ba97ed407bba8 Mon Sep 17 00:00:00 2001
From: Luke Hubmayer-Werner <mongoose41@gmail.com>
Date: Thu, 13 Dec 2018 21:19:56 +1030
Subject: [PATCH] Small 2018 Day 13 cleanup

---
 2018/day13.py | 33 +++++++++------------------------
 1 file changed, 9 insertions(+), 24 deletions(-)

diff --git a/2018/day13.py b/2018/day13.py
index b1c3d53..cc884c9 100644
--- a/2018/day13.py
+++ b/2018/day13.py
@@ -32,41 +32,26 @@ for y, line in enumerate(data):
       minecarts.append([x, y, carts[char][0], 0])
 
 while len(minecarts) > 1:
-  minecarts = sorted(minecarts, key=lambda c: c[1]*200+c[0])
+  minecarts = sorted(minecarts, key=lambda c: (c[1], c[0]))
   i = 0
   while i < len(minecarts):
     mc = minecarts[i]
-    next_index = list(mc[0:2]+directions[mc[2]])
-    g = grid[tuple(next_index)]
-    mc[0:2] = next_index
-    if g == 1 or g == 2:
+    mc[:2] = list(mc[:2]+directions[mc[2]])
+    g = grid[tuple(mc[:2])]
+    if g in (1, 2):
       pass
     elif g == 4:
-      if mc[2] == 0:
-        mc[2] = 3
-      elif mc[2] == 1:
-        mc[2] = 2
-      elif mc[2] == 2:
-        mc[2] = 1
-      elif mc[2] == 3:
-        mc[2] = 0
+      mc[2] = (3, 2, 1, 0)[mc[2]]
     elif g == 5:
-      if mc[2] == 0:
-        mc[2] = 1
-      elif mc[2] == 1:
-        mc[2] = 0
-      elif mc[2] == 2:
-        mc[2] = 3
-      elif mc[2] == 3:
-        mc[2] = 2
+      mc[2] = (1, 0, 3, 2)[mc[2]]
     elif g == 3:
-      mc[2] = (mc[2]+turns[mc[3]])%4
+      mc[2] = (mc[2]+turns[mc[3]]) % 4
       mc[3] = (mc[3]+1) % 3
     for j, mc2 in enumerate(minecarts):
       if mc2 == mc:
         continue
-      if np.array_equal(mc[0:2], mc2[0:2]):
-        print('Crash at', mc[0:2])
+      if np.array_equal(mc[:2], mc2[:2]):
+        print('Crash at', mc[:2])
         if j > i:
           minecarts.pop(j)
           minecarts.pop(i)