linked

(链表) 206. Reverse Linked List

一个人想着一个人 提交于 2020-01-02 01:11:05
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? ----------------------------------------------------------------------------------------------------------------------------------- 链表翻转题 可以用O(1)的空间解决,就是新建立两个辅助结点,不占什么空间,然后,其中一个结点指向head,并且,head改为NULL,然后,进行翻转。 注意在循环是,这两个辅助结点的next的变化,不能漏掉,可以画图来辅助理解和检查。 emmm下面的代码不太好理解。用dummy->next指代head就好理解很多了。 C++代码: 不适用dummy. /** * Definition for singly-linked list. * struct ListNode { * int val; * ListNode *next; *

[leetcode]Reverse Linked List II @ Python

末鹿安然 提交于 2020-01-02 01:08:39
原题地址:https://oj.leetcode.com/problems/reverse-linked-list-ii/ 题意: Reverse a linked list from position m to n . Do it in-place and in one-pass. For example: Given 1->2->3->4->5->NULL , m = 2 and n = 4, return 1->4->3->2->5->NULL . Note: Given m , n satisfy the following condition: 1 ≤ m ≤ n ≤ length of list. 解题思路:翻转链表的题目。 代码: # Definition for singly-linked list. # class ListNode: # def __init__(self, x): # self.val = x # self.next = None class Solution: # @param head, a ListNode # @param m, an integer # @param n, an integer # @return a ListNode def reverseBetween(self, head, m, n): if head ==

206. Reverse Linked List

荒凉一梦 提交于 2020-01-02 01:07:19
Reverse a linked list from position m to n . Do it in-place and in one-pass. For example: Given 1->2->3->4->5->NULL , m = 2 and n = 4, return 1->4->3->2->5->NULL . Note: Given m , n satisfy the following condition: 1 ≤ m ≤ n ≤ length of list. 含义:翻转列表中给定的两个节点间的所有节点 思路:这道题是比较常见的链表反转操作,不过不是反转整个链表,而是从m到n的一部分。分为两个步骤,第一步是找到m结点所在位置,第二步就是进行反转直到n结点。反转的方法就是每读到一个结点,把它插入到m结点前面位置,然后m结点接到读到结点的下一个。总共只需要一次扫描,所以时间是O(n),只需要几个辅助指针,空间是O(1) 1 if(head == null)return null; 2 ListNode dummy = new ListNode(0); 3 dummy.next = head; 4 ListNode preNode = dummy; 5 int i=1; 6 while(preNode.next!=null && i<m) 7 { 8 preNode

[Leetcode]@python 92. Reverse Linked List II

孤街浪徒 提交于 2019-12-17 03:50:49
题目链接 https://leetcode.com/problems/reverse-linked-list-ii/ 题目原文 Reverse a linked list from position m to n. Do it in-place and in one-pass. For example: Given 1->2->3->4->5->NUL L, m = 2 and n = 4, return 1->4->3->2->5->NULL . Note: Given m, n satisfy the following condition: 1 ≤ m ≤ n ≤ length of list. 题目大意 给定一个链表,翻转从位置m到位置n之间的元素。 解题思路 翻转链表的问题:1)记录翻转前面部分的链表 2)翻转指定位置的链表 3)拼接链表 代码 # Definition for singly-linked list. # class ListNode(object): # def __init__(self, x): # self.val = x # self.next = None class Solution(object): def reverseBetween(self, head, m, n): """ :type head: ListNode :type m:

实现ViewPager的联动效果

为君一笑 提交于 2019-12-03 11:27:06
参考链接: android - Synchronizing two ViewPagers using OnPageChangeListener - Stack Overflow 其中有个非常完美的解决方案 https://stackoverflow.com/a/24104748/8562540 操作及其简单 思路一句话:就是在操作当前ViewPager时,将对应操作让关联的ViewPager也执行一次就行 需要注意的是,当前ViewPager(为方便描述,我简称为Master)在带动关联ViewPager(为方便描述,我简称为Linked)时, Linked不能去带动Master,否则后果。。。所以,该方案中用了字段forSuper来阻止Linked带动Master 来源: https://www.cnblogs.com/buyishi/p/11793919.html

refreshing linked tables in access

匿名 (未验证) 提交于 2019-12-03 02:03:01
可以将文章内容翻译成中文,广告屏蔽插件可能会导致该功能失效(如失效,请关闭广告屏蔽插件后再试): 问题: Hey. I have the main access database located on a stand alone PC off the network and i have a access database with linked tables on the network linked back to the stand alone PC. I have linked the tables by creating a network share to the stand alone PC and linking them though a path. Can i set it up so that when the database is opened it automatically updates the linked tables. Ben 回答1: You can. I often find it convenient to use a small check form that runs on start-up (set through start-up options) and checks a variety of things, including

SELECT * FROM Linked MySQL server

匿名 (未验证) 提交于 2019-12-03 01:08:02
可以将文章内容翻译成中文,广告屏蔽插件可能会导致该功能失效(如失效,请关闭广告屏蔽插件后再试): 问题: I have a SQL Server 2012.(120.120.55.15) Today I linked MySQL server(120.120.55.30) to my SQLServer and gave it a name "MYSQL". In Object Explorer everything seems fine. I can see MySQL server's database " exampleDataBase " and tables in it. But when I try to run select query like this: SELECT * FROM openquery ( MYSQL, ' SELECT * FROM [exampleDataBase].[msProcMatrix] ' ) I get a mistake: Msg 7399, Level 16, State 1, Line 1 The OLE DB provider "MSDASQL" for linked server "MYSQL" reported an error. The provider did not give any information

When is doubly linked list more efficient than singly linked list?

匿名 (未验证) 提交于 2019-12-03 01:06:02
可以将文章内容翻译成中文,广告屏蔽插件可能会导致该功能失效(如失效,请关闭广告屏蔽插件后再试): 问题: In an interview today I got asked the question. Apart from answering reversing the list and both forward and backward traversal there was something "fundamental" in it that the interviewer kept stressing. I gave up and of course after interview did a bit of research. It seems that insertion and deletion are more efficient in doubly linked list than singly linked list. I am not quite sure how it can be more efficient for a doubly linked list since it is obvious that more references are required to change. Can anybody explain the secret behind

HashMap 、HashTable、TreeMap、LinkedHashMap的对比区别

匿名 (未验证) 提交于 2019-12-03 00:22:01
1、 共同点 、 LinkedHashMap 、 HashTable 、 TreeMap 都实现了 Map 接口,用于存储键值对,根据键得到值,键是不能重复的。 2、 HashMap (1) 键可以为空 (2) 不是线程安全 如果有两个并发线程同时对 HashMap 进行修改,则会抛出异常: [java] view plain copy 如果要实现线程安全,可以采用 [java] view plain copy (3) 存储方式 KEY 放在数组的同一个单元的一个链表中。 jdk1.7及以前:数组+链表,查询的时间复杂度O(n) jdk1.8:数组+链表/红黑树,当链表的长度大于8时,链表就转换成红黑树,查询的时间复杂度变成O(logn).当扩容时,桶中的元素个数小于树的链表还原阈值(默认是6),则会将红黑树转换成链表。哈希表的最小树形化容量是64,当哈希表的容量大于这个值64时,表中的桶(大于16)才能进行树化。 红黑树是一棵平衡二叉查找树,查找、插入和删除的时间复杂度都是O(logn). 红黑树的特点: 1. 根节点是黑色 2. 叶子节点是黑色 3. 节点是黑色或红色 4. 每个红色节点的两个子节点都是黑色 5. 从任一节点到其每个叶子的所有路径都包含相同数目的黑色节点 (4) 关键属性 capacity 默认 16 、负载因子 loadFactor 默认 0.75 16

IOS XCode10.1使用Carthage管理第三方运行报错 Library not loaded 的解决办法

匿名 (未验证) 提交于 2019-12-03 00:03:02
在用Carthage管理第三方库的时候,需要自己添加第三方库的framework到自己的项目下面,百度上找到都是说添加到 General -> Linked Frameworks and Libraries 下面,但是我这样做了之后编译没问题,但是运行就报错 Library not loaded, 后来找到别人的解决办法说是要在 General -> Embed Frameworks 也添加( https://blog.csdn.net/asdf_2012/article/details/50800791 ),但这是比较早的XCode了,在XCode10.1上应该改为 General -> Embedded Binaries 了。另外我发现在 General -> Embedded Binaries 添加了framework之后,General -> Linked Frameworks and Libraries 下面会自动也添加上,所以,只需要在 General -> Embedded Binaries 上添加就可以。 来源:51CTO 作者: 风轻云淡v10 链接:https://blog.csdn.net/zhumj_zhumj/article/details/100745329