2025-01-12 v. 7.9.3: added "2116. Check if a Parentheses String Can Be Valid"

Author: fartem

README.md

@@ -641,6 +641,7 @@ Profile on LeetCode: [fartem](https://leetcode.com/fartem/).
 | 912. Sort an Array                                               | [Link](https://leetcode.com/problems/sort-an-array/)                                               | [Link](./lib/medium/912_sort_an_array.rb)                                               | [Link](./test/medium/test_912_sort_an_array.rb)                                               |
 | 916. Word Subsets                                                | [Link](https://leetcode.com/problems/word-subsets/)                                                | [Link](./lib/medium/916_word_subsets.rb)                                                | [Link](./test/medium/test_916_word_subsets.rb)                                                |
 | 1400. Construct K Palindrome Strings                             | [Link](https://leetcode.com/problems/construct-k-palindrome-strings/)                              | [Link](./lib/medium/1400_construct_k_palindrome_strings.rb)                             | [Link](./test/medium/test_1400_construct_k_palindrome_strings.rb)                             |
+| 2116. Check if a Parentheses String Can Be Valid                 | [Link](https://leetcode.com/problems/check-if-a-parentheses-string-can-be-valid/)                  | [Link](./lib/medium/2116_check_if_a_parentheses_string_can_be_valid.rb)                 | [Link](./test/medium/test_2116_check_if_a_parentheses_string_can_be_valid.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 = '7.9.2'
+  s.version = '7.9.3'
   s.license = 'MIT'
   s.files = ::Dir['lib/**/*.rb'] + %w[README.md]
   s.executable = 'leetcode-ruby'

lib/medium/2116_check_if_a_parentheses_string_can_be_valid.rb

@@ -0,0 +1,26 @@
+# frozen_string_literal: true
+
+# https://leetcode.com/problems/check-if-a-parentheses-string-can-be-valid/
+# @param {String} s
+# @param {String} locked
+# @return {Boolean}
+def can_be_valid(s, locked)
+  return false if s.size.odd?
+
+  min = 0
+  max = 0
+
+  (0...s.size).each do |i|
+    is_opening = s[i] == '('
+    is_unlocked = locked[i] == '0'
+
+    min += !is_opening || is_unlocked ? -1 : 1
+    max += is_opening || is_unlocked ? 1 : -1
+
+    return false if max.negative?
+
+    min = [min, 0].max
+  end
+
+  min.zero?
+end

test/medium/test_2116_check_if_a_parentheses_string_can_be_valid.rb

@@ -0,0 +1,13 @@
+# frozen_string_literal: true
+
+require_relative '../test_helper'
+require_relative '../../lib/medium/2116_check_if_a_parentheses_string_can_be_valid'
+require 'minitest/autorun'
+
+class CheckIfAParenthesesStringCanBeValidTest < ::Minitest::Test
+  def test_default_one = assert(can_be_valid('))()))', '010100'))
+
+  def test_default_two = assert(can_be_valid('()()', '0000'))
+
+  def test_default_three = assert(!can_be_valid(')', '0'))
+end