【剑指Offer】18.2 删除链表中重复的结点

/*
 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;
        
        ListNode next = pHead.next;
        if(pHead.val == next.val) {
            while(next != null && pHead.val == next.val)
                next = next.next;
            return deleteDuplication(next);
        }else {
            pHead.next = deleteDuplication(next);
            return pHead;
        }
    }
}