题解 | #反转链表#

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 ReverseList( head *ListNode ) *ListNode {
    // write code here
    dummy := &ListNode{}

    for head != nil {
        next := head.Next

        head.Next = dummy.Next
        dummy.Next = head

        head = next
    }

    return dummy.Next
}