2024-11-04 v. 6.9.5: updated tests for "382. Linked List Random Node"

Author: fartem

README.md

@@ -560,3 +560,4 @@ Profile on LeetCode: [fartem](https://leetcode.com/fartem/).
 | 377. Combination Sum IV                                         | [Link](https://leetcode.com/problems/combination-sum-iv/)                                         | [Link](./lib/medium/377_combination_sum_iv.rb)                                         | [Link](./test/medium/test_377_combination_sum_iv.rb)                                         |
 | 378. Kth Smallest Element in a Sorted Matrix                    | [Link](https://leetcode.com/problems/kth-smallest-element-in-a-sorted-matrix/)                    | [Link](./lib/medium/378_kth_smallest_element_in_a_sorted_matrix.rb)                    | [Link](./test/medium/test_378_kth_smallest_element_in_a_sorted_matrix.rb)                    |
 | 380. Insert Delete GetRandom O(1)                               | [Link](https://leetcode.com/problems/insert-delete-getrandom-o1/)                                 | [Link](./lib/medium/380_insert_delete_getrandom_o1.rb)                                 | [Link](./test/medium/test_380_insert_delete_getrandom_o1.rb)                                 |
+| 382. Linked List Random Node                                    | [Link](https://leetcode.com/problems/linked-list-random-node/)                                    | [Link](./lib/medium/382_linked_list_random_node.rb)                                    | [Link](./test/medium/test_382_linked_list_random_node.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 = '6.9.4.1'
+  s.version = '6.9.5'
   s.license = 'MIT'
   s.files = ::Dir['lib/**/*.rb'] + %w[README.md]
   s.executable = 'leetcode-ruby'

lib/medium/382_linked_list_random_node.rb

@@ -0,0 +1,18 @@
+# frozen_string_literal: true
+
+# https://leetcode.com/problems/linked-list-random-node/
+class Solution
+  # @param {ListNode} head
+  def initialize(head)
+    @nodes = []
+
+    until head.nil?
+      @nodes << head.val
+
+      head = head.next
+    end
+  end
+
+  # @return {Integer}
+  def get_random = @nodes[rand(@nodes.size)]
+end

test/medium/test_382_linked_list_random_node.rb

@@ -0,0 +1,22 @@
+# frozen_string_literal: true
+
+require_relative '../test_helper'
+require_relative '../../lib/common/linked_list'
+require_relative '../../lib/medium/382_linked_list_random_node'
+require 'minitest/autorun'
+
+class LinkedListRandomNodeTest < ::Minitest::Test
+  def test_default_one
+    solution = ::Solution.new(
+      ::ListNode.from_array(
+        [1, 2, 3]
+      )
+    )
+
+    assert([1, 2, 3].include?(solution.get_random))
+    assert([1, 2, 3].include?(solution.get_random))
+    assert([1, 2, 3].include?(solution.get_random))
+    assert([1, 2, 3].include?(solution.get_random))
+    assert([1, 2, 3].include?(solution.get_random))
+  end
+end