2023-09-12 v. 2.9.0: added "1346. Check If N and Its Double Exist"

Author: fartem

README.md

@@ -236,3 +236,4 @@ Profile on LeetCode: [fartem](https://leetcode.com/fartem/).
 | 1332. Remove Palindromic Subsequences                      | [Link](https://leetcode.com/problems/remove-palindromic-subsequences/)                      | [Link](./lib/easy/1332_remove_palindromic_subsequences.rb)                      |
 | 1337. The K Weakest Rows in a Matrix                       | [Link](https://leetcode.com/problems/the-k-weakest-rows-in-a-matrix/)                       | [Link](./lib/easy/1337_the_k_weakest_rows_in_a_matrix.rb)                       |
 | 1342. Number of Steps to Reduce a Number to Zero           | [Link](https://leetcode.com/problems/number-of-steps-to-reduce-a-number-to-zero/)           | [Link](./lib/easy/1342_number_of_steps_to_reduce_a_number_to_zero.rb)           |
+| 1346. Check If N and Its Double Exist                      | [Link](https://leetcode.com/problems/check-if-n-and-its-double-exist/)                      | [Link](./lib/easy/1346_check_if_n_and_its_double_exist.rb)                      |

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 = '2.8.9'
+  s.version = '2.9.0'
   s.license = 'MIT'
   s.files = ::Dir['lib/**/*.rb'] + %w[bin/leetcode-ruby README.md LICENSE]
   s.executable = 'leetcode-ruby'

lib/easy/1346_check_if_n_and_its_double_exist.rb

@@ -0,0 +1,15 @@
+# frozen_string_literal: true
+
+# https://leetcode.com/problems/check-if-n-and-its-double-exist/
+# @param {Integer[]} arr
+# @return {Boolean}
+def check_if_exist(arr)
+  nums = ::Set.new
+  arr.each do |num|
+    return true if nums.include?(num * 2) || (num.even? && nums.include?(num / 2))
+
+    nums << num
+  end
+
+  false
+end

test/easy/test_1346_check_if_n_and_its_double_exist.rb

@@ -0,0 +1,12 @@
+# frozen_string_literal: true
+
+require_relative '../test_helper'
+require_relative '../../lib/easy/1346_check_if_n_and_its_double_exist'
+require 'minitest/autorun'
+
+class CheckIfNAndItsDoubleExistTest < ::Minitest::Test
+  def test_default
+    assert(check_if_exist([10, 2, 5, 3]))
+    assert(!check_if_exist([3, 1, 7, 11]))
+  end
+end