From b22b3a34817da7b25b99fa2006a96d7b3f350507 Mon Sep 17 00:00:00 2001
From: Alpha Chen <alpha.chen@gmail.com>
Date: Sat, 16 Dec 2017 21:16:15 -0800
Subject: [PATCH] [2017][ruby][17.x] speedrun

---
 2017/input/day_17.txt |  1 +
 2017/ruby/day_17.rb   | 21 +++++++++++++++++++++
 2 files changed, 22 insertions(+)
 create mode 100644 2017/input/day_17.txt
 create mode 100644 2017/ruby/day_17.rb

diff --git a/2017/input/day_17.txt b/2017/input/day_17.txt
new file mode 100644
index 0000000..41a4a81
--- /dev/null
+++ b/2017/input/day_17.txt
@@ -0,0 +1 @@
+328
\ No newline at end of file
diff --git a/2017/ruby/day_17.rb b/2017/ruby/day_17.rb
new file mode 100644
index 0000000..c3f4ff2
--- /dev/null
+++ b/2017/ruby/day_17.rb
@@ -0,0 +1,21 @@
+input = ARGF.read.strip.to_i
+# input = 3
+
+# buffer = [0]
+pos = 0
+50_000_000.times do |i|
+# 10.times do |i|
+  pos += input + 1
+  # pos %= buffer.size
+  pos %= i + 1
+
+  p i+1 if pos.zero?
+
+  # buffer = (buffer[0..pos] << i+1).concat(buffer[pos+1..-1])
+end
+
+# index = buffer.index(0)
+# p buffer[index+1]
+
+# So 0 is always element 0...
+# So we just need to know when something is inserted at element 1?