From df2f00365dca81a74f253335a8aef4e230d23353 Mon Sep 17 00:00:00 2001
From: fartem <jaman.smlnsk@gmail.com>
Date: Wed, 20 Nov 2024 09:02:11 +0300
Subject: [PATCH] 2024-11-20 v. 7.0.7: added "442. Find All Duplicates in an
 Array"

---
 README.md                                     |  1 +
 leetcode-ruby.gemspec                         |  2 +-
 .../442_find_all_duplicates_in_an_array.rb    | 20 +++++++++++
 ...est_442_find_all_duplicates_in_an_array.rb | 34 +++++++++++++++++++
 4 files changed, 56 insertions(+), 1 deletion(-)
 create mode 100644 lib/medium/442_find_all_duplicates_in_an_array.rb
 create mode 100644 test/medium/test_442_find_all_duplicates_in_an_array.rb

diff --git a/README.md b/README.md
index c1c5d602..99615b39 100644
--- a/README.md
+++ b/README.md
@@ -572,3 +572,4 @@ Profile on LeetCode: [fartem](https://leetcode.com/fartem/).
 | 435. Non-overlapping Intervals                                  | [Link](https://leetcode.com/problems/non-overlapping-intervals/)                                  | [Link](./lib/medium/435_non_overlapping_intervals.rb)                                  | [Link](./test/medium/test_435_non_overlapping_intervals.rb)                                  |
 | 437. Path Sum III                                               | [Link](https://leetcode.com/problems/path-sum-iii/)                                               | [Link](./lib/medium/437_path_sum_iii.rb)                                               | [Link](./test/medium/test_437_path_sum_iii.rb)                                               |
 | 438. Find All Anagrams in a String                              | [Link](https://leetcode.com/problems/find-all-anagrams-in-a-string/)                              | [Link](./lib/medium/438_find_all_anagrams_in_a_string.rb)                              | [Link](./test/medium/test_438_find_all_anagrams_in_a_string.rb)                              |
+| 442. Find All Duplicates in an Array                            | [Link](https://leetcode.com/problems/find-all-duplicates-in-an-array/)                            | [Link](./lib/medium/442_find_all_duplicates_in_an_array.rb)                            | [Link](./test/medium/test_442_find_all_duplicates_in_an_array.rb)                            |
diff --git a/leetcode-ruby.gemspec b/leetcode-ruby.gemspec
index fc55607b..6e77e22b 100644
--- a/leetcode-ruby.gemspec
+++ b/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 = '7.0.6'
+  s.version = '7.0.7'
   s.license = 'MIT'
   s.files = ::Dir['lib/**/*.rb'] + %w[README.md]
   s.executable = 'leetcode-ruby'
diff --git a/lib/medium/442_find_all_duplicates_in_an_array.rb b/lib/medium/442_find_all_duplicates_in_an_array.rb
new file mode 100644
index 00000000..feae91d5
--- /dev/null
+++ b/lib/medium/442_find_all_duplicates_in_an_array.rb
@@ -0,0 +1,20 @@
+# frozen_string_literal: true
+
+# https://leetcode.com/problems/find-all-duplicates-in-an-array/
+# @param {Integer[]} nums
+# @return {Integer[]}
+def find_duplicates(nums)
+  nums.sort!
+  result = []
+  i = 0
+  while i < nums.size
+    if nums[i] == nums[i + 1]
+      result << nums[i]
+      i += 1
+    end
+
+    i += 1
+  end
+
+  result
+end
diff --git a/test/medium/test_442_find_all_duplicates_in_an_array.rb b/test/medium/test_442_find_all_duplicates_in_an_array.rb
new file mode 100644
index 00000000..45ef7f11
--- /dev/null
+++ b/test/medium/test_442_find_all_duplicates_in_an_array.rb
@@ -0,0 +1,34 @@
+# frozen_string_literal: true
+
+require_relative '../test_helper'
+require_relative '../../lib/medium/442_find_all_duplicates_in_an_array'
+require 'minitest/autorun'
+
+class FindAllDuplicatesInAnArrayTest < ::Minitest::Test
+  def test_default_one
+    assert_equal(
+      [2, 3],
+      find_duplicates(
+        [4, 3, 2, 7, 8, 2, 3, 1]
+      )
+    )
+  end
+
+  def test_default_two
+    assert_equal(
+      [1],
+      find_duplicates(
+        [1, 1, 2]
+      )
+    )
+  end
+
+  def test_default_three
+    assert_equal(
+      [],
+      find_duplicates(
+        [1]
+      )
+    )
+  end
+end