From 35742a00a38053dc1eaf7fa81dd21294bf207911 Mon Sep 17 00:00:00 2001
From: Daniel Flanagan <daniel@lyte.dev>
Date: Mon, 14 Dec 2020 10:23:01 -0600
Subject: [PATCH] Quick thought to come back to

---
 2020/src/day13.nim | 1 +
 1 file changed, 1 insertion(+)

diff --git a/2020/src/day13.nim b/2020/src/day13.nim
index 6716510..cbed782 100644
--- a/2020/src/day13.nim
+++ b/2020/src/day13.nim
@@ -22,6 +22,7 @@ proc part2*(s: Stream): int =
   var i = 0
   while true:
     # TODO: this takes too long, need to learn the math?
+    # maybe between each bus there is a regular period of these "coincidences" and we can reduce along those?
     for j in 1..<ss.len:
       if bb.contains j:
         let d = i+j