From 408c7a8b7dce5246a595b7737de6a1b7825a53b8 Mon Sep 17 00:00:00 2001
From: Nat Lasseter <user@4574.co.uk>
Date: Sun, 4 Dec 2022 12:41:13 +0000
Subject: Day 04

---
 day04/part1.rb | 9 +++++++++
 1 file changed, 9 insertions(+)
 create mode 100644 day04/part1.rb

(limited to 'day04/part1.rb')

diff --git a/day04/part1.rb b/day04/part1.rb
new file mode 100644
index 0000000..529572c
--- /dev/null
+++ b/day04/part1.rb
@@ -0,0 +1,9 @@
+pairs = $stdin.readlines.map { |line|
+  line.strip.split(?,).map { |range|
+    Range.new(*range.split(?-).map(&:to_i))
+  }
+}
+
+puts pairs.select { |a, b|
+  a.cover?(b) || b.cover?(a)
+}.count
-- 
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