83. 删除排序链表中的重复元素---LeetCode---JAVA

/**
 * Definition for singly-linked list.
 * public class ListNode {
 *     int val;
 *     ListNode next;
 *     ListNode() {}
 *     ListNode(int val) { this.val = val; }
 *     ListNode(int val, ListNode next) { this.val = val; this.next = next; }
 * }
 */
class Solution {
    public ListNode deleteDuplicates(ListNode head) {
        if(head==null){
            return head;
        }
        ListNode dummy=new ListNode(0,head);

        ListNode cur=dummy.next;
        while(cur!=null&&cur.next!=null){
            if(cur.val==cur.next.val){
                    cur.next=cur.next.next;
            }else{
                cur=cur.next;
            }
        }
        return dummy.next;
    }
}