2025-01-07 v. 7.7.5: added "869. Reordered Power of 2"

README.md

@@ -631,6 +631,7 @@ Profile on LeetCode: [fartem](https://leetcode.com/fartem/).
 | 858. Mirror Reflection                                          | [Link](https://leetcode.com/problems/mirror-reflection/)                                          | [Link](./lib/medium/858_mirror_reflection.rb)                                          | [Link](./test/medium/test_858_mirror_reflection.rb)                                          |
 | 863. All Nodes Distance K in Binary Tree                        | [Link](https://leetcode.com/problems/all-nodes-distance-k-in-binary-tree/)                        | [Link](./lib/medium/863_all_nodes_distance_k_in_binary_tree.rb)                        | [Link](./test/medium/test_863_all_nodes_distance_k_in_binary_tree.rb)                        |
 | 865. Smallest Subtree with all the Deepest Nodes                | [Link](https://leetcode.com/problems/smallest-subtree-with-all-the-deepest-nodes/)                | [Link](./lib/medium/865_smallest_subtree_with_all_the_deepest_nodes.rb)                | [Link](./test/medium/test_865_smallest_subtree_with_all_the_deepest_nodes.rb)                |
+| 869. Reordered Power of 2                                       | [Link](https://leetcode.com/problems/reordered-power-of-2/)                                       | [Link](./lib/medium/869_reordered_power_of_2.rb)                                       | [Link](./test/medium/test_869_reordered_power_of_2.rb)                                       |
 
 ### Hard
 

leetcode-ruby.gemspec

@@ -5,7 +5,7 @@ require 'English'
 ::Gem::Specification.new do |s|
   s.required_ruby_version = '>= 3.0'
   s.name = 'leetcode-ruby'
-  s.version = '7.7.4'
+  s.version = '7.7.5'
   s.license = 'MIT'
   s.files = ::Dir['lib/**/*.rb'] + %w[README.md]
   s.executable = 'leetcode-ruby'

lib/medium/869_reordered_power_of_2.rb

@@ -0,0 +1,27 @@
+# frozen_string_literal: true
+
+# https://leetcode.com/problems/reordered-power-of-2/
+# @param {Integer} n
+# @return {Boolean}
+def reordered_power_of2(n)
+  arr = count_for_reordered_power_of2(n)
+  (0...31).each do |i|
+    return true if arr == count_for_reordered_power_of2(1 << i)
+  end
+
+  false
+end
+
+private
+
+# @param {Integer} n
+# @return {Integer[]}
+def count_for_reordered_power_of2(n)
+  result = ::Array.new(10, 0)
+  while n.positive?
+    result[n % 10] += 1
+    n /= 10
+  end
+
+  result
+end

test/medium/test_869_reordered_power_of_2.rb

@@ -0,0 +1,11 @@
+# frozen_string_literal: true
+
+require_relative '../test_helper'
+require_relative '../../lib/medium/869_reordered_power_of_2'
+require 'minitest/autorun'
+
+class ReorderedPowerOf2Test < ::Minitest::Test
+  def test_default_one = assert(reordered_power_of2(1))
+
+  def test_default_two = assert(!reordered_power_of2(10))
+end