题解 | #牛牛队列成环#
牛牛队列成环
https://www.nowcoder.com/practice/38467f349b3a4db595f58d43fe64fcc7
import java.util.*; 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 bool布尔型 */ public boolean hasCycle (ListNode head) { // write code here if (head == null || head.next == null) return false; ListNode slow = head; ListNode fast = head; while (fast.next.next != null) { slow = slow.next; fast = fast.next.next; if (slow.val == fast.val) return true; } return false; } }