LeetCode-Remove Duplicates from Sorted List

题目：https://oj.leetcode.com/problems/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.

源码：Java版本
算法分析：时间复杂度O(n)，空间复杂度O(1)

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