# 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 not head or not head.next: return head
dummy=ListNode(0)
dummy.next=head
pre=dummy
start=head
curr=head.next
while curr:
if curr.val==start.val:
while curr and curr.val==start.val:
curr=curr.next
pre.next=curr
start=curr
curr=curr.next if curr else None
else:
pre,start,curr=pre.next,start.next,curr.next
return dummy.next
82. Remove Duplicates from Sorted List II
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