题解 | #删除有序链表中重复的元素-I#

# class ListNode:
#     def __init__(self, x):
#         self.val = x
#         self.next = None

#
# 
# @param head ListNode类 
# @return ListNode类
#
class Solution:
    def deleteDuplicates(self , head ):
        # write code here
        if head == None:
            return head
        poc = head
        ed = poc
        while poc != None:
            if ed.val != poc.val:
                ed.next = poc
                ed = ed.next
            poc = poc.next
        ed.next = None
        return head