Remove Duplicates from Sorted List II @ LeetCode (Python)
kitt
posted @ 2014年4月14日 20:06
in LeetCode
, 2367 阅读
# class ListNode:
# def __init__(self, x):
# self.val = x
# self.next = None
class Solution:
# @param head, a ListNode
# @return a ListNode
def deleteDuplicates(self, head):
if head == None: return None
dummy = ListNode(10**10)
dummy.next, head = head, dummy # add a dummy node
pprev, prev, curr, dupFlag = head, head.next, head.next.next, False
while True:
if dupFlag == True:
if curr == None:
pprev.next = None
break
if prev.val != curr.val:
pprev.next, prev, dupFlag = curr, curr, False
else:
if curr == None: break
if prev.val == curr.val:
dupFlag = True
else:
pprev, prev = pprev.next, prev.next
curr = curr.next
return head.next # remove dummy
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