删除链表中重复的结点（剑指offer）

/*
 public class ListNode {
    int val;
    ListNode next = null;

    ListNode(int val) {
        this.val = val;
    }
}
*/
public class Solution {
    public ListNode deleteDuplication(ListNode pHead) {
        if(pHead==null||pHead.next==null) return pHead;
        if(pHead.val==pHead.next.val){
            ListNode pNode=pHead;
            while (pNode!=null && pNode.val==pHead.val){
                pNode=pNode.next;
            }
            return deleteDuplication(pNode);
        }else {
            pHead.next=deleteDuplication(pHead.next);
            return pHead;
        }
    }
}