剑指Offer 18 删除链表的节点

在一个排序的链表中，存在重复的结点，请删除该链表中重复的结点，重复的结点不保留，返回链表头指针。例如，链表1->2->3->3->4->4->5 处理后为 1->2->5

 1 class Solution:
 2     def deleteDuplication(self, pHead):
 3         if pHead == None or pHead.next == None:
 4             return pHead
 5         n = pHead.next
 6         if pHead.val == n.val:
 7             while n and pHead.val == n.val:
 8                 n = n.next
 9             return self.deleteDuplication(n)
10         else:
11             pHead.next = self.deleteDuplication(pHead.next)
12             return pHead
13         # write code here