leetcode 83. remove-duplicates-from-sorted-list删除排序链表中的重复元素 python3

时间：2021-02-28

题目地址：https://leetcode-cn.com/problems/remove-duplicates-from-sorted-list/

题目难度：Easy

题目描述：

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 1:

输入: 1->1->2
输出: 1->2
示例 2:

输入: 1->1->2->3->3
输出: 1->2->3

---

思路1:快慢指针

代码段1：通过

# Definition for singly-linked list.
# class ListNode:
#     def __init__(self, val=0, next=None):
#         self.val = val
#         self.next = next
class Solution:
    def deleteDuplicates(self, head: ListNode) -> ListNode:
        if head == None:
            return head
        res = head
        slow, fast = head, head
        while fast != None:
            if slow.val != fast.val:
                slow.next = fast
                slow = slow.next
            fast = fast.next
        slow.next = None
        return res

总结：

1. 空链表的特殊判断，最后断开连接这步别忘了