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- /**
- * 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 middleNode(ListNode head) {
- if(head == null || head.next == null){
- return head;
- }
- ListNode slow = head;
- ListNode fast = head;
- while(fast != null && fast.next != null){
- slow = slow.next;
- fast = fast.next.next;
- }
- return slow;
- }
- }
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