package q328

type ListNode struct {
	Val  int
	Next *ListNode
}

func oddEvenList(head *ListNode) *ListNode {
	odd := &ListNode{}
	even := &ListNode{}
	pO, pE := odd, even

	i := 0
	for p := head; p != nil; p = p.Next {
		i++
		if i%2 == 0 {
			pE.Next = p
			pE = p
		} else {
			pO.Next = p
			pO = p
		}
	}
	pE.Next = nil
	pO.Next = even.Next
	return odd.Next
}

var _ = oddEvenList