From c96b02e390b0613bd179485a3c906b875c18fa46 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?=C8=98tefan-Iulian=20Alecu?=
 <165364995+pascalecu@users.noreply.github.com>
Date: Wed, 13 May 2026 22:38:20 +0300
Subject: [PATCH] Add Maximum Array Rotation in Ruby

---
 archive/r/ruby/maximum-array-rotation.rb | 37 ++++++++++++++++++++++++
 1 file changed, 37 insertions(+)
 create mode 100644 archive/r/ruby/maximum-array-rotation.rb

diff --git a/archive/r/ruby/maximum-array-rotation.rb b/archive/r/ruby/maximum-array-rotation.rb
new file mode 100644
index 000000000..229e1e91d
--- /dev/null
+++ b/archive/r/ruby/maximum-array-rotation.rb
@@ -0,0 +1,37 @@
+# frozen_string_literal: true
+
+USAGE = 'Usage: please provide a list of integers (e.g. "8, 3, 1, 2")'
+
+def usage!
+  warn USAGE
+  exit 1
+end
+
+def parse_list(str)
+  str.split(",").map { Integer(it.strip) }
+rescue ArgumentError, NoMethodError
+  usage!
+end
+
+def max_rotation_sum(arr)
+  n = arr.size
+  total_sum = arr.sum
+  current = arr.each_with_index.sum { |v, i| i * v }
+
+  max = current
+
+  (1...n).each do |i|
+    last = arr[n - i]
+    current += total_sum - n * last
+    max = current if current > max
+  end
+
+  max
+end
+
+raw = ARGV.first
+usage! if raw.nil? || raw.strip.empty?
+
+arr = parse_list(raw)
+
+puts max_rotation_sum(arr)