Leetcode +206 Reverse Linked List

Leetcode +206 Reverse Linked List"/>

Leetcode +206 Reverse Linked List

Leetcode +206 Reverse Linked List

题目描述

Reverse a singly linked list.

Example:

Input: 1->2->3->4->5->NULL
Output: 5->4->3->2->1->NULL

Follow up:

A linked list can be reversed either iteratively or recursively. Could you implement both?

来源：力扣（LeetCode）
链接：
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思路解析

# Definition for singly-linked list.
# class ListNode:
#     def __init__(self, x):
#         self.val = x
#         self.next = Noneclass Solution:def reverseList(self, head: ListNode) -> ListNode:new_head = None        while head :     tmp = head.next   head.next = new_headnew_head = headhead = tmp       return new_head