From a1cb1a1b16b2304ee2c688e289395c65e4d7a657 Mon Sep 17 00:00:00 2001
From: Piotr Russ <mail@pruss.it>
Date: Sun, 13 Dec 2020 12:27:49 +0100
Subject: day13

---
 day13/day13-2.js | 22 ++++++++++++++++++++++
 1 file changed, 22 insertions(+)
 create mode 100644 day13/day13-2.js

(limited to 'day13/day13-2.js')

diff --git a/day13/day13-2.js b/day13/day13-2.js
new file mode 100644
index 0000000..0e6d11c
--- /dev/null
+++ b/day13/day13-2.js
@@ -0,0 +1,22 @@
+const data = require('./data')
+const [first, ...busses] = data
+  .split('\n')
+  .filter(d => d !== '')[1]
+  .split(',')
+  .map(d => d === 'x' ? null : parseInt(d))
+
+let interval = first, t = 0
+busses.forEach((b, i) => {
+  if (b) {
+    while(true){
+      if ((t+i+1) % b === 0) {
+        interval *= b
+        break
+      }
+      t += interval
+    }
+  }
+})
+
+console.log('Answer: ', t)
+
-- 
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