删除排序链表中的重复元素(java代码简洁高效)
给定一个已排序的链表的头 head , 删除所有重复的元素,使每个元素只出现一次 。返回 已排序的链表 。
示例 1:
输入:head = [1,1,2]
输出:[1,2]
示例 2:
输入:head = [1,1,2,3,3]
输出:[1,2,3]
提示:
链表中节点数目在范围 [0, 300] 内
-100 <= Node.val <= 100
/** * Definition for singly-linked list. * public class ListNode { * int val; * ListNode next; * ListNode() {} * ListNode(int val) { this.val = val; } * ListNode(int val, ListNode next) { this.val = val; this.next = next; } * } */ class Solution { public ListNode deleteDuplicates(ListNode head) { if(head == null || head.next == null){ return head; } head.next = deleteDuplicates(head.next); if(head.val == head.next.val) head = head.next; return head; } }
来源:力扣(LeetCode)
链接:https://leetcode.cn/problems/remove-duplicates-from-sorted-list