diff --git a/README.md b/README.md index 8e27f528..91c343ab 100644 --- a/README.md +++ b/README.md @@ -731,6 +731,7 @@ Profile on LeetCode: [fartem](https://leetcode.com/fartem/). | 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) | | 2091. Removing Minimum and Maximum From Array | [Link](https://leetcode.com/problems/removing-minimum-and-maximum-from-array/) | [Link](./lib/medium/2091_removing_minimum_and_maximum_from_array.rb) | [Link](./test/medium/test_2091_removing_minimum_and_maximum_from_array.rb) | +| 2095. Delete the Middle Node of a Linked List | [Link](https://leetcode.com/problems/delete-the-middle-node-of-a-linked-list/) | [Link](./lib/medium/2095_delete_the_middle_node_of_a_linked_list.rb) | [Link](./test/medium/test_2095_delete_the_middle_node_of_a_linked_list.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 6330fe68..d01dbb71 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 = '8.9.7' + s.version = '8.9.8' s.license = 'MIT' s.files = ::Dir['lib/**/*.rb'] + %w[README.md] s.executable = 'leetcode-ruby' diff --git a/lib/medium/2095_delete_the_middle_node_of_a_linked_list.rb b/lib/medium/2095_delete_the_middle_node_of_a_linked_list.rb new file mode 100644 index 00000000..6ad46547 --- /dev/null +++ b/lib/medium/2095_delete_the_middle_node_of_a_linked_list.rb @@ -0,0 +1,22 @@ +# frozen_string_literal: true + +# https://leetcode.com/problems/delete-the-middle-node-of-a-linked-list/ +# @param {ListNode} head +# @return {ListNode} +def delete_middle(head) + prev = nil + slow = head + fast = head + + while fast&.next + prev = slow + slow = slow.next + fast = fast.next.next + end + + return unless prev + + prev.next = slow.next + + head +end diff --git a/test/medium/test_2095_delete_the_middle_node_of_a_linked_list.rb b/test/medium/test_2095_delete_the_middle_node_of_a_linked_list.rb new file mode 100644 index 00000000..2e7c11ac --- /dev/null +++ b/test/medium/test_2095_delete_the_middle_node_of_a_linked_list.rb @@ -0,0 +1,53 @@ +# frozen_string_literal: true + +require_relative '../test_helper' +require_relative '../../lib/common/linked_list' +require_relative '../../lib/medium/2095_delete_the_middle_node_of_a_linked_list' +require 'minitest/autorun' + +class DeleteTheMiddleNodeOfALinkedListTest < ::Minitest::Test + def test_default_one + assert( + ::ListNode.are_equals( + ::ListNode.from_array( + [1, 3, 4, 1, 2, 6] + ), + delete_middle( + ::ListNode.from_array( + [1, 3, 4, 7, 1, 2, 6] + ) + ) + ) + ) + end + + def test_default_two + assert( + ::ListNode.are_equals( + ::ListNode.from_array( + [1, 2, 4] + ), + delete_middle( + ::ListNode.from_array( + [1, 2, 3, 4] + ) + ) + ) + ) + end + + def test_default_three + assert( + ::ListNode.are_equals( + ::ListNode.from_array( + [2] + ), + delete_middle( + ::ListNode.from_array( + [2, 1] + ) + ) + ) + ) + end +end