day13

1 files changed, 22 insertions, 0 deletions

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)
+