题解 | #牛群排列去重#

# 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
        start = head
        if(start == None):
            return(start)
        while(head.next):
            if(head.val == head.next.val):
                if(head.next.next == None):
                    head.next = None
                    break
                else:
                    head.next = head.next.next
            else:
                head = head.next
        return(start)