83. Remove Duplicates from Sorted List

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Given a sorted linked list, delete all duplicates such that each element appear only once.

Example 1:

Input: 1->1->2
Output: 1->2

Example 2:

Input: 1->1->2->3->3
Output: 1->2->3

解法：

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

class Solution:
    def deleteDuplicates(self, head: ListNode) -> ListNode:
        head_bak=head
        while head_bak:
            tmp=head_bak.next
            while tmp :
                if tmp.val==head_bak.val:
                    tmp=tmp.next
                else:
                    break
                
            head_bak.next=tmp
            head_bak=tmp
        return head

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