Leetcode: Reverse Linked List - Qiita

require 'minitest/autorun' require 'pry' class ReverseLinkedList < Minitest::Test def test_run # Input: 1->2->3->4->5->NULL # Output: 5->4->3->2->1->NULL head = ListNode.new(1) head.next = ListNode.new(2) head.next.next = ListNode.new(3) head.next.next.next = ListNode.new(4) head.next.next.next.next = ListNode.new(5) new_head = reverse_list(head) assert_equal(5, new_head.val) assert_equal(4, new_h