2024-07-19 v. 6.2.3: added "61. Rotate List"

Author: fartem

README.md

@@ -488,3 +488,4 @@ Profile on LeetCode: [fartem](https://leetcode.com/fartem/).
 | 56. Merge Intervals                                         | [Link](https://leetcode.com/problems/merge-intervals/)                                         | [Link](./lib/medium/56_merge_intervals.rb)                                         |
 | 57. Insert Interval                                         | [Link](https://leetcode.com/problems/insert-interval/)                                         | [Link](./lib/medium/57_insert_interval.rb)                                         |
 | 59. Spiral Matrix II                                        | [Link](https://leetcode.com/problems/spiral-matrix-ii/)                                        | [Link](./lib/medium/59_spiral_matrix_ii.rb)                                        |
+| 61. Rotate ListII                                           | [Link](https://leetcode.com/problems/rotate-list/)                                             | [Link](./lib/medium/61_rotate_list.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 = '6.2.2'
+  s.version = '6.2.3'
   s.license = 'MIT'
   s.files = ::Dir['lib/**/*.rb'] + %w[bin/leetcode-ruby README.md LICENSE]
   s.executable = 'leetcode-ruby'

lib/common/linked_list.rb

@@ -21,6 +21,7 @@ def self.from_array(values)
       list.next = ::ListNode.new(value)
       list = list.next
     end
+
     head
   end
 

lib/medium/61_rotate_list.rb

@@ -0,0 +1,36 @@
+# frozen_string_literal: true
+
+require_relative '../common/linked_list'
+
+# https://leetcode.com/problems/rotate-list/
+# @param {ListNode} head
+# @param {Integer} k
+# @return {ListNode}
+def rotate_right(head, k)
+  size = 0
+  p = head
+
+  until p.nil?
+    p = p.next
+    size += 1
+  end
+
+  return head if size < 2 || size == k
+
+  places = k > size ? k % size : k
+
+  return head if places.zero?
+
+  div = head
+  (0...(size - places - 1)).each { |_| div = div&.next }
+
+  old_head = head
+  head = div&.next
+  div&.next = nil
+  last = head
+
+  last = last&.next until last&.next.nil?
+  last&.next = old_head
+
+  head
+end

test/easy/test_100_same_tree.rb

@@ -1,8 +1,8 @@
 # frozen_string_literal: true
 
 require_relative '../test_helper'
-require_relative '../../lib/easy/100_same_tree'
 require_relative '../../lib/common/binary_tree'
+require_relative '../../lib/easy/100_same_tree'
 require 'minitest/autorun'
 
 class SameTreeTest < ::Minitest::Test

test/easy/test_101_symmetric_tree.rb

@@ -1,8 +1,8 @@
 # frozen_string_literal: true
 
 require_relative '../test_helper'
-require_relative '../../lib/easy/101_symmetric_tree'
 require_relative '../../lib/common/binary_tree'
+require_relative '../../lib/easy/101_symmetric_tree'
 require 'minitest/autorun'
 
 class SymmetricTreeTest < ::Minitest::Test

test/easy/test_104_maximum_depth_of_binary_tree.rb

@@ -1,8 +1,8 @@
 # frozen_string_literal: true
 
 require_relative '../test_helper'
-require_relative '../../lib/easy/104_maximum_depth_of_binary_tree'
 require_relative '../../lib/common/binary_tree'
+require_relative '../../lib/easy/104_maximum_depth_of_binary_tree'
 require 'minitest/autorun'
 
 class MaximumDepthOfBinaryTreeTest < ::Minitest::Test

test/easy/test_108_convert_sorted_array_to_binary_search_tree.rb

@@ -1,8 +1,8 @@
 # frozen_string_literal: true
 
 require_relative '../test_helper'
-require_relative '../../lib/easy/108_convert_sorted_array_to_binary_search_tree'
 require_relative '../../lib/common/binary_tree'
+require_relative '../../lib/easy/108_convert_sorted_array_to_binary_search_tree'
 require 'minitest/autorun'
 
 class ConvertSortedArrayToBinarySearchTreeTest < ::Minitest::Test

test/easy/test_110_balanced_binary_tree.rb

@@ -1,8 +1,8 @@
 # frozen_string_literal: true
 
 require_relative '../test_helper'
-require_relative '../../lib/easy/110_balanced_binary_tree'
 require_relative '../../lib/common/binary_tree'
+require_relative '../../lib/easy/110_balanced_binary_tree'
 require 'minitest/autorun'
 
 class BalancedBinaryTreeTest < ::Minitest::Test

test/easy/test_111_minimum_depth_of_binary_tree.rb

@@ -1,8 +1,8 @@
 # frozen_string_literal: true
 
 require_relative '../test_helper'
-require_relative '../../lib/easy/111_minimum_depth_of_binary_tree'
 require_relative '../../lib/common/binary_tree'
+require_relative '../../lib/easy/111_minimum_depth_of_binary_tree'
 require 'minitest/autorun'
 
 class MinimumDepthOfBinaryTreeTest < ::Minitest::Test

test/easy/test_112_path_sum.rb

@@ -1,8 +1,8 @@
 # frozen_string_literal: true
 
 require_relative '../test_helper'
-require_relative '../../lib/easy/112_path_sum'
 require_relative '../../lib/common/binary_tree'
+require_relative '../../lib/easy/112_path_sum'
 require 'minitest/autorun'
 
 class PathSumTest < ::Minitest::Test

test/easy/test_141_linked_list_cycle.rb

@@ -1,8 +1,8 @@
 # frozen_string_literal: true
 
 require_relative '../test_helper'
-require_relative '../../lib/easy/141_linked_list_cycle'
 require_relative '../../lib/common/linked_list'
+require_relative '../../lib/easy/141_linked_list_cycle'
 require 'minitest/autorun'
 
 class LinkedListCycleTest < ::Minitest::Test

test/easy/test_144_binary_tree_preorder_traversal.rb

@@ -1,8 +1,8 @@
 # frozen_string_literal: true
 
 require_relative '../test_helper'
-require_relative '../../lib/easy/144_binary_tree_preorder_traversal'
 require_relative '../../lib/common/binary_tree'
+require_relative '../../lib/easy/144_binary_tree_preorder_traversal'
 require 'minitest/autorun'
 
 class BinaryTreePreorderTraversalTest < ::Minitest::Test

test/easy/test_145_binary_tree_postorder_traversal.rb

@@ -1,8 +1,8 @@
 # frozen_string_literal: true
 
 require_relative '../test_helper'
-require_relative '../../lib/easy/145_binary_tree_postorder_traversal'
 require_relative '../../lib/common/binary_tree'
+require_relative '../../lib/easy/145_binary_tree_postorder_traversal'
 require 'minitest/autorun'
 
 class BinaryTreePostorderTraversalTest < ::Minitest::Test

test/easy/test_160_intersection_of_two_linked_lists.rb

@@ -1,8 +1,8 @@
 # frozen_string_literal: true
 
 require_relative '../test_helper'
-require_relative '../../lib/easy/160_intersection_of_two_linked_lists'
 require_relative '../../lib/common/linked_list'
+require_relative '../../lib/easy/160_intersection_of_two_linked_lists'
 require 'minitest/autorun'
 
 class IntersectionOfTwoLinkedListsTest < ::Minitest::Test

test/easy/test_203_remove_linked_list_elements.rb

@@ -1,8 +1,8 @@
 # frozen_string_literal: true
 
 require_relative '../test_helper'
-require_relative '../../lib/easy/203_remove_linked_list_elements'
 require_relative '../../lib/common/linked_list'
+require_relative '../../lib/easy/203_remove_linked_list_elements'
 require 'minitest/autorun'
 
 class RemoveLinkedListElementsTest < ::Minitest::Test

test/easy/test_2236_root_equals_sum_of_children.rb

@@ -1,8 +1,8 @@
 # frozen_string_literal: true
 
 require_relative '../test_helper'
-require_relative '../../lib/easy/2236_root_equals_sum_of_children'
 require_relative '../../lib/common/binary_tree'
+require_relative '../../lib/easy/2236_root_equals_sum_of_children'
 require 'minitest/autorun'
 
 class RootEqualsSumOfChildrenTest < ::Minitest::Test

test/easy/test_2239_find_closest_number_to_zero.rb

@@ -2,7 +2,6 @@
 
 require_relative '../test_helper'
 require_relative '../../lib/easy/2239_find_closest_number_to_zero'
-require_relative '../../lib/common/binary_tree'
 require 'minitest/autorun'
 
 class FindClosestNumberToZeroTest < ::Minitest::Test

test/easy/test_2331_evaluate_boolean_binary_tree.rb

@@ -1,8 +1,8 @@
 # frozen_string_literal: true
 
 require_relative '../test_helper'
-require_relative '../../lib/easy/2331_evaluate_boolean_binary_tree'
 require_relative '../../lib/common/binary_tree'
+require_relative '../../lib/easy/2331_evaluate_boolean_binary_tree'
 require 'minitest/autorun'
 
 class EvaluateBooleanBinaryTreeTest < ::Minitest::Test

test/easy/test_83_remove_duplicates_from_sorted_list.rb

@@ -1,8 +1,8 @@
 # frozen_string_literal: true
 
 require_relative '../test_helper'
-require_relative '../../lib/easy/83_remove_duplicates_from_sorted_list'
 require_relative '../../lib/common/linked_list'
+require_relative '../../lib/easy/83_remove_duplicates_from_sorted_list'
 require 'minitest/autorun'
 
 class RemoveDuplicatesFromSortedListTest < ::Minitest::Test

test/easy/test_94_binary_tree_inorder_traversal.rb

@@ -1,8 +1,8 @@
 # frozen_string_literal: true
 
 require_relative '../test_helper'
-require_relative '../../lib/easy/94_binary_tree_inorder_traversal'
 require_relative '../../lib/common/binary_tree'
+require_relative '../../lib/easy/94_binary_tree_inorder_traversal'
 require 'minitest/autorun'
 
 class BinaryTreeInorderTraversalTest < ::Minitest::Test

test/medium/test_19_remove_nth_node_from_end_of_list.rb

@@ -1,8 +1,8 @@
 # frozen_string_literal: true
 
 require_relative '../test_helper'
-require_relative '../../lib/medium/19_remove_nth_node_from_end_of_list'
 require_relative '../../lib/common/linked_list'
+require_relative '../../lib/medium/19_remove_nth_node_from_end_of_list'
 require 'minitest/autorun'
 
 class RemoveNthNodeFromEndOfListTest < ::Minitest::Test

test/medium/test_24_swap_nodes_in_pairs.rb

@@ -1,8 +1,8 @@
 # frozen_string_literal: true
 
 require_relative '../test_helper'
-require_relative '../../lib/medium/24_swap_nodes_in_pairs'
 require_relative '../../lib/common/linked_list'
+require_relative '../../lib/medium/24_swap_nodes_in_pairs'
 require 'minitest/autorun'
 
 class SwapNodesInPairsTest < ::Minitest::Test

test/medium/test_2_add_two_numbers.rb

@@ -1,8 +1,8 @@
 # frozen_string_literal: true
 
 require_relative '../test_helper'
-require_relative '../../lib/medium/2_add_two_numbers'
 require_relative '../../lib/common/linked_list'
+require_relative '../../lib/medium/2_add_two_numbers'
 require 'minitest/autorun'
 
 class AddTwoNumbersTest < ::Minitest::Test

test/medium/test_61_rotate_list.rb

@@ -0,0 +1,23 @@
+# frozen_string_literal: true
+
+require_relative '../test_helper'
+require_relative '../../lib/common/linked_list'
+require_relative '../../lib/medium/61_rotate_list'
+require 'minitest/autorun'
+
+class RotateListTest < ::Minitest::Test
+  def test_default
+    assert(
+      ::ListNode.are_equals(
+        ::ListNode.from_array([4, 5, 1, 2, 3]),
+        rotate_right(::ListNode.from_array([1, 2, 3, 4, 5]), 2)
+      )
+    )
+    assert(
+      ::ListNode.are_equals(
+        ::ListNode.from_array([2, 0, 1]),
+        rotate_right(::ListNode.from_array([0, 1, 2]), 4)
+      )
+    )
+  end
+end