题解 | #删除有序链表中重复的元素-I#
删除有序链表中重复的元素-I
https://www.nowcoder.com/practice/c087914fae584da886a0091e877f2c79
import java.util.*; /* * public class ListNode { * int val; * ListNode next = null; * public ListNode(int val) { * this.val = val; * } * } */ public class Solution { /** * 代码中的类名、方法名、参数名已经指定,请勿修改,直接返回方法规定的值即可 * * * @param head ListNode类 * @return ListNode类 */ public ListNode deleteDuplicates (ListNode head) { // write code here if(head==null){ return head; } Set<Integer> set = new HashSet<>(); ListNode cur = head.next; ListNode pre = head; set.add(head.val); while(cur!=null){ if(set.contains(cur.val)){ cur = cur.next; pre.next = cur; }else{ set.add(cur.val); cur = cur.next; pre = pre.next; } } return head; } }