链表_leetcode83
# 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
pre = head
cur = pre.next
curVal = pre.val
while pre and cur:
while cur and cur.val == curVal:
cur = cur.next
if not cur:
pre.next = None
return head
pre.next = cur
pre = cur
cur = pre.next
curVal = pre.val
return head
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