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- 题目数据保证链表已经按升序 排列
解题答案
/**
* 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) {
ListNode cur = head;
while (cur != null && cur.next != null ) {
if (cur.val == cur.next.val) {
cur.next = cur.next.next;
} else {
cur = cur.next;
}
}
return head;
}
}