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: if not head: return head pre=None while head is not None: temp=head.next head.next=pre pre=head head=temp return pre