83. 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.

pointer ->temp, when pointer changes, head will change especially the sign =, 有赋值符号，因为指向的是同一个对象。temp=temp.next 对head没有影响，这个是指针移动的过程。

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

referrence: leetcode solutions