2025-02-03 v. 8.3.8: added "1249. Minimum Remove to Make Valid Parentheses"

Author: fartem

README.md

@@ -670,6 +670,7 @@ Profile on LeetCode: [fartem](https://leetcode.com/fartem/).
 | 1209. Remove All Adjacent Duplicates in String II                | [Link](https://leetcode.com/problems/remove-all-adjacent-duplicates-in-string-ii/)                 | [Link](./lib/medium/1209_remove_all_adjacent_duplicates_in_string_ii.rb)                | [Link](./test/medium/test_1209_remove_all_adjacent_duplicates_in_string_ii.rb)                |
 | 1247. Minimum Swaps to Make Strings Equal                        | [Link](https://leetcode.com/problems/minimum-swaps-to-make-strings-equal/)                         | [Link](./lib/medium/1247_minimum_swaps_to_make_strings_equal.rb)                        | [Link](./test/medium/test_1247_minimum_swaps_to_make_strings_equal.rb)                        |
 | 1248. Count Number of Nice Subarrays                             | [Link](https://leetcode.com/problems/count-number-of-nice-subarrays/)                              | [Link](./lib/medium/1248_count_number_of_nice_subarrays.rb)                             | [Link](./test/medium/test_1248_count_number_of_nice_subarrays.rb)                             |
+| 1249. Minimum Remove to Make Valid Parentheses                   | [Link](https://leetcode.com/problems/minimum-remove-to-make-valid-parentheses/)                    | [Link](./lib/medium/1249_minimum_remove_to_make_valid_parentheses.rb)                   | [Link](./test/medium/test_1249_minimum_remove_to_make_valid_parentheses.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)                 |
 | 2425. Bitwise XOR of All Pairings                                | [Link](https://leetcode.com/problems/bitwise-xor-of-all-pairings/)                                 | [Link](./lib/medium/2425_bitwise_xor_of_all_pairings.rb)                                | [Link](./test/medium/test_2425_bitwise_xor_of_all_pairings.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 = '8.3.7'
+  s.version = '8.3.8'
   s.license = 'MIT'
   s.files = ::Dir['lib/**/*.rb'] + %w[README.md]
   s.executable = 'leetcode-ruby'

lib/medium/1249_minimum_remove_to_make_valid_parentheses.rb

@@ -0,0 +1,31 @@
+# frozen_string_literal: true
+
+require 'set'
+
+# https://leetcode.com/problems/minimum-remove-to-make-valid-parentheses/
+# @param {String} s
+# @return {String}
+def min_remove_to_make_valid(s)
+  stack = []
+
+  (0...s.size).each do |i|
+    curr = s[i]
+
+    next if curr.match?(/[[:alpha:]]/)
+
+    if curr == '('
+      stack.push(i)
+    elsif !stack.empty? && s[stack.last] == '('
+      stack.pop
+    else
+      stack.push(i)
+    end
+  end
+
+  result = ''
+  set = stack.to_set
+
+  (0...s.size).each { |i| result += s[i] unless set.include?(i) }
+
+  result
+end

test/medium/test_1249_minimum_remove_to_make_valid_parentheses.rb

@@ -0,0 +1,34 @@
+# frozen_string_literal: true
+
+require_relative '../test_helper'
+require_relative '../../lib/medium/1249_minimum_remove_to_make_valid_parentheses'
+require 'minitest/autorun'
+
+class MinimumRemoveToMakeValidParenthesesTest < ::Minitest::Test
+  def test_default_one
+    assert_equal(
+      'lee(t(c)o)de',
+      min_remove_to_make_valid(
+        'lee(t(c)o)de'
+      )
+    )
+  end
+
+  def test_default_two
+    assert_equal(
+      'ab(c)d',
+      min_remove_to_make_valid(
+        'a)b(c)d'
+      )
+    )
+  end
+
+  def test_default_three
+    assert_equal(
+      '',
+      min_remove_to_make_valid(
+        '))(('
+      )
+    )
+  end
+end