LeetCode-82-Remove Duplicates from Sorted List II 链表

# Definition for singly-linked list.
# class ListNode(object):
#     def __init__(self, x):
#         self.val = x
#         self.next = None

class Solution(object):
    def deleteDuplicates(self, head):
        """
        :type head: ListNode
        :rtype: ListNode
        """
        #if head==None:return []
        ans=ListNode(1)
        ans.next=head
        res=ans
        while ans!=None and ans.next!=None:
            curHead=ans.next
            curV=curHead.val
            flag=0
            while curHead.next!=None:
                curNode=curHead.next
                if curNode.val==curHead.val:
                    flag=1
                    curHead=curHead.next
                else:
                    break
            if flag:
                ans.next=curHead.next
            else :
                ans.next=curHead
                ans=ans.next
        return res.next