From 1cd2b62ba0701f2edcb90ddf31d1a3f906fde82d Mon Sep 17 00:00:00 2001
From: Jeff Yates <jeff@z800.lab.doublehack.me>
Date: Wed, 9 Dec 2020 11:29:07 -0500
Subject: [PATCH] solved part 1

---
 day09/solution1.rb | 18 ++++++++++++++++++
 1 file changed, 18 insertions(+)
 create mode 100755 day09/solution1.rb

diff --git a/day09/solution1.rb b/day09/solution1.rb
new file mode 100755
index 0000000..09e50c9
--- /dev/null
+++ b/day09/solution1.rb
@@ -0,0 +1,18 @@
+#!/bin/env ruby
+
+def valid_nums (nums)
+    nums.map { |num| nums
+        .map { |sub| sub + num if sub != num }}.flatten.uniq.compact
+end
+
+numbers = File.readlines('./input').to_ary.map(&:strip!).map(&:to_i)
+preamble = 25
+
+
+numbers.each.with_index do |number, i|
+    next if i < preamble
+    if !valid_nums(numbers[(i-preamble)..(i-1)]).include?(number)
+        puts number
+        break
+    end
+end
\ No newline at end of file