From 6c99554a68459f122c092fc5ac136b054c590717 Mon Sep 17 00:00:00 2001
From: fartem <jaman.smlnsk@gmail.com>
Date: Mon, 21 Apr 2025 07:11:24 +0300
Subject: [PATCH] 2025-04-21 v. 9.3.0: added "3090. Maximum Length Substring
 With Two Occurrences"

---
 README.md                                     |  1 +
 leetcode-ruby.gemspec                         |  2 +-
 ...m_length_substring_with_two_occurrences.rb | 24 ++++++++++++++++++
 ...m_length_substring_with_two_occurrences.rb | 25 +++++++++++++++++++
 4 files changed, 51 insertions(+), 1 deletion(-)
 create mode 100644 lib/easy/3090_maximum_length_substring_with_two_occurrences.rb
 create mode 100644 test/easy/test_3090_maximum_length_substring_with_two_occurrences.rb

diff --git a/README.md b/README.md
index 559c0758..e3ea1eb3 100644
--- a/README.md
+++ b/README.md
@@ -456,6 +456,7 @@ Profile on LeetCode: [fartem](https://leetcode.com/fartem/).
 | 2652. Sum Multiples                                                | [Link](https://leetcode.com/problems/sum-multiples/)                                                | [Link](./lib/easy/2652_sum_multiples.rb)                                                | [Link](./test/easy/test_2652_sum_multiples.rb)                                                |
 | 2974. Minimum Number Game                                          | [Link](https://leetcode.com/problems/minimum-number-game/)                                          | [Link](./lib/easy/2974_minimum_number_game.rb)                                          | [Link](./test/easy/test_2974_minimum_number_game.rb)                                          |
 | 3083. Existence of a Substring in a String and Its Reverse         | [Link](https://leetcode.com/problems/existence-of-a-substring-in-a-string-and-its-reverse/)         | [Link](./lib/easy/3083_existence_of_a_substring_in_a_string_and_its_reverse.rb)         | [Link](./test/easy/test_3083_existence_of_a_substring_in_a_string_and_its_reverse.rb)         |
+| 3090. Maximum Length Substring With Two Occurrences                | [Link](https://leetcode.com/problems/maximum-length-substring-with-two-occurrences/)                | [Link](./lib/easy/3090_maximum_length_substring_with_two_occurrences.rb)                | [Link](./test/easy/test_3090_maximum_length_substring_with_two_occurrences.rb)                |
 | 3110. Score of a String                                            | [Link](https://leetcode.com/problems/score-of-a-string/)                                            | [Link](./lib/easy/3110_score_of_a_string.rb)                                            | [Link](./test/easy/test_3110_score_of_a_string.rb)                                            |
 | 3131. Find the Integer Added to Array I                            | [Link](https://leetcode.com/problems/find-the-integer-added-to-array-i/)                            | [Link](./lib/easy/3131_find_the_integer_added_to_array_i.rb)                            | [Link](./test/easy/test_3131_find_the_integer_added_to_array_i.rb)                            |
 | 3136. Valid Word                                                   | [Link](https://leetcode.com/problems/valid-word/)                                                   | [Link](./lib/easy/3136_valid_word.rb)                                                   | [Link](./test/easy/test_3136_valid_word.rb)                                                   |
diff --git a/leetcode-ruby.gemspec b/leetcode-ruby.gemspec
index df76138f..afbccf1d 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 = '9.2.9.1'
+  s.version = '9.3.0'
   s.license = 'MIT'
   s.files = ::Dir['lib/**/*.rb'] + %w[README.md]
   s.executable = 'leetcode-ruby'
diff --git a/lib/easy/3090_maximum_length_substring_with_two_occurrences.rb b/lib/easy/3090_maximum_length_substring_with_two_occurrences.rb
new file mode 100644
index 00000000..9305ceb4
--- /dev/null
+++ b/lib/easy/3090_maximum_length_substring_with_two_occurrences.rb
@@ -0,0 +1,24 @@
+# frozen_string_literal: true
+
+# https://leetcode.com/problems/maximum-length-substring-with-two-occurrences/
+# @param {String} s
+# @return {Integer}
+def maximum_length_substring(s)
+  max_len = 0
+  left = 0
+  char_count = ::Hash.new(0)
+
+  s.each_char.with_index do |char, right|
+    char_count[char] += 1
+
+    while char_count[char] > 2
+      char_count[s[left]] -= 1
+      left += 1
+    end
+
+    current_len = right - left + 1
+    max_len = [max_len, current_len].max
+  end
+
+  max_len
+end
diff --git a/test/easy/test_3090_maximum_length_substring_with_two_occurrences.rb b/test/easy/test_3090_maximum_length_substring_with_two_occurrences.rb
new file mode 100644
index 00000000..a627638d
--- /dev/null
+++ b/test/easy/test_3090_maximum_length_substring_with_two_occurrences.rb
@@ -0,0 +1,25 @@
+# frozen_string_literal: true
+
+require_relative '../test_helper'
+require_relative '../../lib/easy/3090_maximum_length_substring_with_two_occurrences'
+require 'minitest/autorun'
+
+class MaximumLengthSubstringWithTwoOccurrencesTest < ::Minitest::Test
+  def test_default_one
+    assert_equal(
+      4,
+      maximum_length_substring(
+        'bcbbbcba'
+      )
+    )
+  end
+
+  def test_default_two
+    assert_equal(
+      2,
+      maximum_length_substring(
+        'aaaa'
+      )
+    )
+  end
+end