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class ListNode { int val; ListNode next; ListNode(int val) { this.val = val; } } public class Solution { public ListNode oddEvenList(ListNode head) { if (head == null || head.next == null) { return head; } ListNode odd = head; ListNode even = head.next; ListNode evenHead = even; while (even != null && even.next != null) { odd.next = even.next; odd = odd.next; even.next = odd.next; even = even.next; } odd.next = evenHead; // Link the end of odd list to the even list head return head; } }
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