题

package main
import . "nc_tools"
/*
 * type ListNode struct{
 *   Val int
 *   Next *ListNode
 * }
 */

/**
 * 
 * @param pHead ListNode类 
 * @return ListNode类
*/
func ReverseList( pHead *ListNode ) *ListNode {
    // write code here
    if pHead == nil{
        return nil
    }
    var res *ListNode
    
    for pHead != nil{
        pNext := pHead.Next
        pHead.Next = res
        res = pHead
        pHead = pNext
       
    }
    return res
}