From 0c36586b2190f92c330ba0d27d1f7f2313733824 Mon Sep 17 00:00:00 2001
From: Sebastian Seedorf <mail@sebse.de>
Date: Thu, 17 Dec 2020 00:43:17 +0100
Subject: [PATCH] Day 15 (static array length 14s -> 10s)

---
 day15/common.py | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/day15/common.py b/day15/common.py
index 168c724..e8d2dcd 100644
--- a/day15/common.py
+++ b/day15/common.py
@@ -2,7 +2,7 @@ from functools import reduce
 
 
 def yield_numbers(line: str, target: int):
-    nums = {}
+    nums = [None]*target
     turn = 0
     last_spoken = 0
     for starting in map(int, line.split(",")):
@@ -11,7 +11,7 @@ def yield_numbers(line: str, target: int):
         last_spoken = starting
         yield turn, last_spoken, nums
     for t in range(turn, target):
-        n = t - nums[last_spoken] if last_spoken in nums else 0
+        n = t - nums[last_spoken] if nums[last_spoken] is not None else 0
         nums[last_spoken] = t
         last_spoken = n
         yield t+1, last_spoken, nums