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leetcode Remove Duplicates from Sorted List II

 

Given a sorted linked list, delete all nodes that have duplicate numbers, leaving only distinct numbers from the original list.

For example,
Given 1->2->3->3->4->4->5, return 1->2->5.
Given 1->1->1->2->3, return 2->3.

public class Solution {    public ListNode deleteDuplicates(ListNode head) {        if(head == null || head.next == null)            return head;                ListNode temp = new ListNode(0);        temp.next = head;        head = temp;        while (head.next != null && head.next.next != null) {            if (head.next.val == head.next.next.val) {                int val = head.next.val;                while (head.next != null && head.next.val == val) {                    head.next = head.next.next;                }                        } else {                head = head.next;            }        }                return temp.next;    }}

  

leetcode Remove Duplicates from Sorted List II