leetcode83.删除排序链表中的重复元素

83.删除排序链表中的重复元素

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->3->3
输出: 1->2->3

# 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:
        if not head:
            return head
        if head.next is not None and head.val == head.next.val:
            head = head.next
            return self.deleteDuplicates(head)
        else:
            head.next = self.deleteDuplicates(head.next)
        return head
# 递归