diff --git a/README.md b/README.md index b7cde933..1b7b1c09 100644 --- a/README.md +++ b/README.md @@ -729,6 +729,7 @@ Profile on LeetCode: [fartem](https://leetcode.com/fartem/). | 2023. Number of Pairs of Strings With Concatenation Equal to Target | [Link](https://leetcode.com/problems/number-of-pairs-of-strings-with-concatenation-equal-to-target/) | [Link](./lib/medium/2023_number_of_pairs_of_strings_with_concatenation_equal_to_target.rb) | [Link](./test/medium/test_2023_number_of_pairs_of_strings_with_concatenation_equal_to_target.rb) | | 2058. Find the Minimum and Maximum Number of Nodes Between Critical Points | [Link](https://leetcode.com/problems/find-the-minimum-and-maximum-number-of-nodes-between-critical-points/) | [Link](./lib/medium/2058_find_the_minimum_and_maximum_number_of_nodes_between_critical_points.rb) | [Link](./test/medium/test_2058_find_the_minimum_and_maximum_number_of_nodes_between_critical_points.rb) | | 2063. Vowels of All Substrings | [Link](https://leetcode.com/problems/vowels-of-all-substrings/) | [Link](./lib/medium/2063_vowels_of_all_substrings.rb) | [Link](./test/medium/test_2063_vowels_of_all_substrings.rb) | +| 2074. Reverse Nodes in Even Length Groups | [Link](https://leetcode.com/problems/reverse-nodes-in-even-length-groups/) | [Link](./lib/medium/2074_reverse_nodes_in_even_length_groups.rb) | [Link](./test/medium/test_2074_reverse_nodes_in_even_length_groups.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) | | 2429. Minimize XOR | [Link](https://leetcode.com/problems/minimize-xor/) | [Link](./lib/medium/2429_minimize_xor.rb) | [Link](./test/medium/test_2429_minimize_xor.rb) | diff --git a/leetcode-ruby.gemspec b/leetcode-ruby.gemspec index 47f6d514..6db8ff23 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 = '8.9.5' + s.version = '8.9.6' s.license = 'MIT' s.files = ::Dir['lib/**/*.rb'] + %w[README.md] s.executable = 'leetcode-ruby' diff --git a/lib/medium/2074_reverse_nodes_in_even_length_groups.rb b/lib/medium/2074_reverse_nodes_in_even_length_groups.rb new file mode 100644 index 00000000..d0894572 --- /dev/null +++ b/lib/medium/2074_reverse_nodes_in_even_length_groups.rb @@ -0,0 +1,45 @@ +# frozen_string_literal: true + +# https://leetcode.com/problems/reverse-nodes-in-even-length-groups/ +# @param {ListNode} head +# @return {ListNode} +def reverse_even_length_groups(head) + nodes = [] + p = head + + while p + nodes << p + p = p.next + end + + counter = 1 + size = nodes.size + index = 0 + + while size.positive? + count = [counter, size].min + + if count.even? + upper_limit = count + index - 1 + i = index + j = 0 + + while j < count / 2 + a = nodes[i] + b = nodes[upper_limit - j] + temp = a.val + a.val = b.val + b.val = temp + + i += 1 + j += 1 + end + end + + size -= counter + index += counter + counter += 1 + end + + head +end diff --git a/test/medium/test_2074_reverse_nodes_in_even_length_groups.rb b/test/medium/test_2074_reverse_nodes_in_even_length_groups.rb new file mode 100644 index 00000000..110548df --- /dev/null +++ b/test/medium/test_2074_reverse_nodes_in_even_length_groups.rb @@ -0,0 +1,53 @@ +# frozen_string_literal: true + +require_relative '../test_helper' +require_relative '../../lib/common/linked_list' +require_relative '../../lib/medium/2074_reverse_nodes_in_even_length_groups' +require 'minitest/autorun' + +class ReverseNodesInEvenLengthGroupsTest < ::Minitest::Test + def test_default_one + assert( + ::ListNode.are_equals( + ::ListNode.from_array( + [5, 6, 2, 3, 9, 1, 4, 8, 3, 7] + ), + reverse_even_length_groups( + ::ListNode.from_array( + [5, 2, 6, 3, 9, 1, 7, 3, 8, 4] + ) + ) + ) + ) + end + + def test_default_two + assert( + ::ListNode.are_equals( + ::ListNode.from_array( + [1, 0, 1, 6] + ), + reverse_even_length_groups( + ::ListNode.from_array( + [1, 1, 0, 6] + ) + ) + ) + ) + end + + def test_default_three + assert( + ::ListNode.are_equals( + ::ListNode.from_array( + [1, 0, 1, 5, 6] + ), + reverse_even_length_groups( + ::ListNode.from_array( + [1, 1, 0, 6, 5] + ) + ) + ) + ) + end +end