题解 | #删除有序链表中重复的元素-II#

删除有序链表中重复元素的python实现

# class ListNode:
#     def __init__(self, x):
#         self.val = x
#         self.next = None
#
# 代码中的类名、方法名、参数名已经指定，请勿修改，直接返回方法规定的值即可
#
# 
# @param head ListNode类 
# @return ListNode类
#
class Solution:
    def deleteDuplicates(self , head: ListNode) -> ListNode:
        # write code here
        if not head or not head.next:
            return head
        dummy = ListNode(1001)
        dummy.next = head
        pre = dummy
        cur = head
        while cur:
            while cur.next and (cur.val == cur.next.val):
                cur = cur.next
            if pre.next==cur:
                pre = pre.next
            else:
                pre.next = cur.next
            cur = cur.next
        return dummy.next