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leetcode 【 Remove Duplicates from Sorted List 】 python 实现

题目

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

For example,
Given 1->1->2, return 1->2.
Given 1->1->2->3->3, return 1->2->3.

 

代码

 1 # Definition for singly-linked list. 2 # class ListNode: 3 #     def __init__(self, x): 4 #         self.val = x 5 #         self.next = None 6  7 class Solution: 8     # @param head, a ListNode 9     # @return a ListNode10     def deleteDuplicates(self, head):11         if head is None or head.next is None:12             return head13         14         dummyhead = ListNode(0)15         dummyhead.next = head16         p = dummyhead.next17         18         while p.next is not None:19             if p.val == p.next.val:20                 p.next = p.next.next21             else:22                 p = p.next23         24         return dummyhead.next

 

思路

设立虚表头dummyhead

遇上val不同的,再执行 p=p.next;否则指针p不动,只是p.next变化。

leetcode 【 Remove Duplicates from Sorted List 】 python 实现