题目描述
输入一个链表，反转链表后，输出新链表的表头。
# -*- coding:utf-8 -*-
# class ListNode:
# def __init__(self, x):
# self.val = x
# self.next = None
class Solution:
# 返回ListNode
def ReverseList(self, pHead):
# write code here
if not pHead or not pHead.next:
return pHead
last = None
while pHead:
temp = pHead.next
pHead.next = last
last = pHead
pHead = temp
return last