给定一个排序链表,删除所有重复的元素,使得每个元素只出现一次。
示例:
输入: 1->1->2
输出: 1->2
输入: 1->1->2->3->3
输出: 1->2->3
class Solution(object):
def deleteDuplicates(self, head):
"""
:type head: ListNode
:rtype: ListNode
"""
if head == None:
return None
point=head
while point.next:
if(point.val==point.next.val):
point.next=point.next.next
else:
point=point.next
return head