Why do you have to create 2 linked lists?


  • 0

    This person's solution is an example of what I am talking about: https://discuss.leetcode.com/topic/11463/java-o-n-solution-very-easy-to-understand/2.

    I do not understand why the code only works if you write:

      ListNode head = new ListNode(0);
      ListNode current = head;
    

    And doesn't work if you write:

    ListNode head = new ListNode(0);
    ListNode current = new ListNode(0); 
    

    Like why do you have to set current to head? I am stuck.

    In addition to that, why is head.next returned? It seems like the code does not modify the head at all so I have no idea why returning head.next works because to me it seems like head.next would be empty. Please someone help me!


Log in to reply
 

Looks like your connection to LeetCode Discuss was lost, please wait while we try to reconnect.