9/100. Reverse Linked List

反转单链表。

迭代法：
pFront（开始设置为None）、pNode、pNext（重点是记住下一节点，免得丢了）。

# Definition for singly-linked list.
# class ListNode:
#     def __init__(self, x):
#         self.val = x
#         self.next = Noneclass Solution:def reverseList(self, head):""":type head: ListNode:rtype: ListNode"""pFront = NonepNode = headwhile pNode:pNext = pNode.nextpNode.next = pFrontpFront = pNodepNode = pNextreturn pFront

递归法：
先递归到最后一个节点，pre.next=head（反转），head.next=None（切断）。

    def reverseList(self, head):if not head or not head.next:return headpre = self.reverseList(head.next)head.next.next = headhead.next = Nonereturn pre

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