package q19

type ListNode struct {
	Val  int
	Next *ListNode
}

func removeNthFromEnd(head *ListNode, n int) *ListNode {
	stub := &ListNode{Next: head}

	probe := stub
	for range n {
		probe = probe.Next
	}
	prev := stub

	for probe.Next != nil {
		probe = probe.Next
		prev = prev.Next
	}
	prev.Next = prev.Next.Next

	return stub.Next
}

var _ = removeNthFromEnd