83. 删除排序链表中的重复元素 Java版

class Solution {
    public ListNode deleteDuplicates(ListNode head) {

        if(head==null||head.next==null){
            return head;
        }

        head.next=deleteDuplicates(head.next);
        if(head.val==head.next.val)
            head=head.next;

        return head;
    }
}