题目:
反转一个单链表。
示例:
输入: 1->2->3->4->5->NULL
输出: 5->4->3->2->1->NULL
进阶:
你可以迭代或递归地反转链表。你能否用两种方法解决这道题?
题目的理解:
新建一个链表,然后循环给定的链表来获取每一个节点,将节点倒序添加到新链表上。
python实现
# Definition for singly-linked list.
# class ListNode:
# def __init__(self, x):
# self.val = x
# self.next = None
class Solution:
def reverseList(self, head: ListNode) -> ListNode:
if head is None or head.next is None:
return head
current = head.next
result = ListNode(head.val)
while current is not None:
temp = current.next
current.next = result
result = current
current = temp
return result
提交
哇哈哈// END 无薪待业 !_!
网友评论