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
	if head == nil || head.Next == nil {
		return head
	}

	var dummy *ListNode
	cur := head
	for cur != nil {
		next := cur.Next
		cur.Next = dummy
		dummy = cur
		cur = next
	}

	return dummy
}