2024-07-23 v. 6.2.9: added "82. Remove Duplicates from Sorted List II"

Author: fartem

README.md

@@ -494,3 +494,4 @@ Profile on LeetCode: [fartem](https://leetcode.com/fartem/).
 | 74. Search a 2D Matrix                                      | [Link](https://leetcode.com/problems/search-a-2d-matrix/)                                      | [Link](./lib/medium/74_search_a_2d_matrix.rb)                                      |
 | 75. Sort Colors                                             | [Link](https://leetcode.com/problems/sort-colors/)                                             | [Link](./lib/medium/75_sort_colors.rb)                                             |
 | 78. Subsets                                                 | [Link](https://leetcode.com/problems/subsets/)                                                 | [Link](./lib/medium/78_subsets.rb)                                                 |
+| 82. Remove Duplicates from Sorted List II                   | [Link](https://leetcode.com/problems/remove-duplicates-from-sorted-list-ii/)                   | [Link](./lib/medium/82_remove_duplicates_from_sorted_list_ii.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 = '6.2.8'
+  s.version = '6.2.9'
   s.license = 'MIT'
   s.files = ::Dir['lib/**/*.rb'] + %w[README.md]
   s.executable = 'leetcode-ruby'

lib/medium/82_remove_duplicates_from_sorted_list_ii.rb

@@ -0,0 +1,25 @@
+# frozen_string_literal: true
+
+require_relative '../common/linked_list'
+
+# https://leetcode.com/problems/remove-duplicates-from-sorted-list-ii/
+# @param {ListNode} head
+# @return {ListNode}
+def delete_duplicates82(head)
+  result = ::ListNode.new(0, head)
+  prev = result
+
+  until head.nil?
+    if !head.next.nil? && head.val == head.next.val
+      head = head.next while !head.next.nil? && head.val == head.next.val
+
+      prev.next = head.next
+    else
+      prev = prev.next
+    end
+
+    head = head.next
+  end
+
+  result.next
+end

test/medium/test_82_remove_duplicates_from_sorted_list_ii.rb

@@ -0,0 +1,33 @@
+# frozen_string_literal: true
+
+require_relative '../test_helper'
+require_relative '../../lib/common/linked_list'
+require_relative '../../lib/medium/82_remove_duplicates_from_sorted_list_ii'
+require 'minitest/autorun'
+
+class RemoveDuplicatesFromSortedListIITest < ::Minitest::Test
+  def test_default
+    assert(
+      ::ListNode.are_equals(
+        ::ListNode.from_array(
+          [1, 2, 5]
+        ),
+        delete_duplicates82(
+          ::ListNode.from_array(
+            [1, 2, 3, 3, 4, 4, 5]
+          )
+        )
+      )
+    )
+    assert(
+      ::ListNode.are_equals(
+        ::ListNode.from_array([2, 3]),
+        delete_duplicates82(
+          ::ListNode.from_array(
+            [1, 1, 1, 2, 3]
+          )
+        )
+      )
+    )
+  end
+end