剑指Offer 18 删除链表的节点

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

class Solution:
    def deleteDuplication(self, pHead):
        if pHead == None or pHead.next == None:
            return pHead
        n = pHead.next
        if pHead.val == n.val:
            while n and pHead.val == n.val:
                n = n.next
            return self.deleteDuplication(n)
        else:
            pHead.next = self.deleteDuplication(pHead.next)
            return pHead
        # write code here