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Leetcode #328: Odd Even Linked List

leetcode

Posted at 2019-08-22

func oddEvenList(_ head: ListNode?) -> ListNode? {
    let dummyNode = ListNode(0)
    dummyNode.next = head
    var odd = head
    var even = head?.next
    var evenHead = even
    while even != nil && even?.next != nil {
        odd?.next = even?.next
        even?.next = even?.next?.next
        odd = odd?.next
        even = even?.next
    }
    odd?.next = evenHead
    return dummyNode.next
}

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