[Leetcode] Remove Duplicates from Sorted List

Given a sorted linked list, delete all duplicates such that each element appear only once.

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

/** * Definition for singly-linked list. * public class ListNode { * int val; * ListNode next; * ListNode(int x) { val = x; } * } */ public class Solution { public ListNode deleteDuplicates(ListNode head) { if(head==null) return head; ListNode p=head; while(p.next!=null) { while(p.next.val==p.val) { if(p.next.next==null) { p.next=null; return head; } else p.next=p.next.next; } p=p.next; } return head; } }