题目：

题解：

func removeNthFromEnd(head *ListNode, n int) *ListNode {dummy := &ListNode{0, head}first, second := head, dummyfor i := 0; i < n; i++ {first = first.Next}for ; first != nil; first = first.Next {second = second.Next}second.Next = second.Next.Nextreturn dummy.Next
}