题解 | #反转链表#

import re
# class ListNode:
#     def __init__(self, x):
#         self.val = x
#         self.next = None
#
# 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
#
class Solution:
    def ReverseList(self , head: ListNode) -> ListNode:
        # write code here
        pre = None 
        while head:
            temp = head.next
            head.next = pre
            pre = head
            head = temp
        return pre

终于会了，看了正确答案，debug了一下然后画了画图终于会了，还是指针这种概念不熟悉，但是画图真的很有用，慢慢加油啦