[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.

比较简单的链表操作题，使用双指针的方法，一个扫描，一个保持当前没有重复的链表的结尾。

public ListNode deleteDuplicates(ListNode head) {
        if(head == null || head.next == null) {
            return head;
        }
        ListNode temp1 = head, temp2 = head.next;
        
        while(temp1 != null) {
            while(temp2 != null && temp1.val == temp2.val) {
                temp2 = temp2.next;
            }
            temp1.next = temp2;
            temp1 = temp2;
            if(temp2 != null) temp2 = temp2.next;
        }
        
        return head;
    }