From 8fae5d618d02a84e355fca75fbcdbb63fcc170a0 Mon Sep 17 00:00:00 2001
From: Joshua Seigler <repl.it@joshua.seigler.net>
Date: Wed, 16 Dec 2020 16:55:13 +0000
Subject: [PATCH] Day 15

---
 day15.js | 1 +
 1 file changed, 1 insertion(+)
 create mode 100644 day15.js

diff --git a/day15.js b/day15.js
new file mode 100644
index 0000000..a9de590
--- /dev/null
+++ b/day15.js
@@ -0,0 +1 @@
+I=[9,12,1,4,17,0,18],F=a=>{L=new Map(I.slice(0,-1).map((a,b)=>[a,b]));let b=I[I.length-1];for(let c=I.length;c<a;c++)n=c-1-L.get(b)||0,L.set(b,c-1),b=n;return b},[F(2020),F(3e7)];
\ No newline at end of file