83. 删除排序链表中的重复元素

浅浅的花香味﹌ 2022-09-10 03:18 154阅读 0赞

[https://leetcode-cn.com/problems/remove-duplicates-from-sorted-list/][https_leetcode-cn.com_problems_remove-duplicates-from-sorted-list]

难度简单634收藏分享切换为英文接收动态反馈

存在一个按升序排列的链表，给你这个链表的头节点 `head` ，请你删除所有重复的元素，使每个元素 **只出现一次** 。

返回同样按升序排列的结果链表。

**示例 1：**

![1ec4e4b0209f2eaf8d83311c11a7eaf8.png][]

输入：head = [1,1,2]
    输出：[1,2]

**示例 2：**

![0db7f73e053e33f11319f8a4bad40827.png][]

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`
 *  题目数据保证链表已经按升序排列

通过次数304,640提交次数565,564

/**
     * 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) return head;
            ListNode node = head;
            while(head.next!=null)
            {
                if(head.val == head.next.val) head.next = head.next.next;
                else head = head.next;
            }
            return node;
        }
    }

![watermark_type_ZHJvaWRzYW5zZmFsbGJhY2s_shadow_50_text_Q1NETiBA5Yqq5Yqb5a2m5Lmg55qE5qKF5a2Q_size_20_color_FFFFFF_t_70_g_se_x_16][]

[https_leetcode-cn.com_problems_remove-duplicates-from-sorted-list]: https://leetcode-cn.com/problems/remove-duplicates-from-sorted-list/
[1ec4e4b0209f2eaf8d83311c11a7eaf8.png]: /images/20220829/01c2f19cc9a54b689888e1e441b3c6df.png
[0db7f73e053e33f11319f8a4bad40827.png]: /images/20220829/65f3c95b23494404b39c23a4cfff18bc.png
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