From 6fbf18f8048d4197d289767ea5c3aaa70f451a11 Mon Sep 17 00:00:00 2001
From: onyx-and-iris <code@onyxandiris.online>
Date: Tue, 2 Dec 2025 07:10:01 +0000
Subject: [PATCH] add day_02

---
 day_02/1.rb | 24 ++++++++++++++++++++++++
 day_02/2.rb | 34 ++++++++++++++++++++++++++++++++++
 2 files changed, 58 insertions(+)
 create mode 100755 day_02/1.rb
 create mode 100755 day_02/2.rb

diff --git a/day_02/1.rb b/day_02/1.rb
new file mode 100755
index 0000000..0159e7d
--- /dev/null
+++ b/day_02/1.rb
@@ -0,0 +1,24 @@
+#!/usr/bin/env ruby
+# frozen_string_literal: true
+
+class Main
+  def run
+    @sum = 0
+
+    line = $stdin.gets.chomp
+    line.split(",").each do |range|
+      lo, hi = range.split("-")
+      (lo..hi).each do |num|
+        if num.length.even?
+          if num[0..(num.length / 2) - 1] == num[(num.length / 2)..]
+            @sum += num.to_i
+          end
+        end
+      end
+    end
+
+    puts @sum
+  end
+end
+
+Main.new.run
diff --git a/day_02/2.rb b/day_02/2.rb
new file mode 100755
index 0000000..26af9c4
--- /dev/null
+++ b/day_02/2.rb
@@ -0,0 +1,34 @@
+#!/usr/bin/env ruby
+# frozen_string_literal: true
+
+class Main
+  def run
+    @sum = 0
+
+    line = $stdin.gets.chomp
+    line.split(",").each do |range|
+      lo, hi = range.split("-")
+      (lo..hi).each do |num|
+        (1..num.length / 2).each do |n|
+          if num.length % n != 0
+            next
+          end
+
+          parts = num.scan(/(\d{#{n}})/).map { _1[0] }
+          if all_equal? parts
+            @sum += num.to_i
+            break
+          end
+        end
+      end
+    end
+
+    puts @sum
+  end
+
+  def all_equal?(arr)
+    arr.uniq.size <= 1
+  end
+end
+
+Main.new.run