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