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- /**
- * Definition for singly-linked list.
- * class ListNode {
- * int val;
- * ListNode next;
- * ListNode(int x) {
- * val = x;
- * next = null;
- * }
- * }
- */
- public class Solution {
- public boolean hasCycle(ListNode head) {
- ListNode slow = head;
- ListNode fast = head;
- while (fast != null && fast.next !=null) {
- fast = fast.next.next;
- slow = slow.next;
- if (fast == slow) {
- return true;
- }
- }
- return false;
- }
- }
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