package main
import . "nc_tools"
/*
* type ListNode struct{
* Val int
* Next *ListNode
* }
*/
/**
* 代码中的类名、方法名、参数名已经指定,请勿修改,直接返回方法规定的值即可
*
*
* @param head ListNode类
* @return ListNode类
*/
func swapLinkedPair( head *ListNode ) *ListNode {
// write code here
if head == nil || head.Next == nil{
return head
}
node := head.Next.Next
root := head.Next
head.Next.Next = head
head.Next = swapLinkedPair(node)
return root
}