The 2-3-4 tree is a B-Tree of order 4. It is a self-balancing data structure that can be found, inserted, and deleted in O (LGN) time, where n is the number of elements in the tree. 2-3-4 trees and red black trees are equivalent, that is, each red and black tree can be conve
Chapter 1: a goal
A ship with no sailing targets, the wind in any direction is against the wind
1. Why are you poor? The first point is that you have not set the goal of becoming a rich man.
2. What are your core goals in your life? The fundamental difference between an outstanding person and a mediocre person is not talent or opportunity, but whether there is a goal or not.
3. One step ahead: Success begins with the target
There are four threads of 1, 2, 3, 4.The function of thread 1 is output 1,The function of thread 2 is output 2, etc... There are now four file ABCD.The initial is empty.Now you want four files to appear in the following format:A:1 2 3 4 1 2 ....B:2 3
Python 3 Study Notes (4) ---- character encoding, functions and parameters, python Study Notes
I. character encoding and Transcoding
1. In python2, the default encoding is ASCII, and in python3, the default encoding is unicode.2. unicode is divided into utf-32 (4 bytes), UTF-16 (2 bytes), UTF-8 (1-4 bytes), so UTF-16 i
Chapter One: a goal
A ship without a sailing target, wind in any direction is upwind.
1, why you are poor, the 1th is that you have not set a goal to become rich
2. What is your core goal in life? The fundamental difference between a distinguished person and a mediocre is not a gift, an opportunity, but a goal.
3, one step ahead of the start, life ahead of a big step: Success starts from the selected target
4
(3/18) re-learn Standford_iOS7 development _ Objective-C _ course notes, iPhone 4 upgrade ios7
Lesson 3:
This course is mainly a demo of game implementation. Therefore, I will extract some simple programming skills from the course, focusing on how to implement the requirements in my homework.
Card game implementation:
① The game is a part of the Model (understand
-UPDOWN: line protocol on interface fastethernet0/1, changed state to down % LINEPROTO-5-UPDOWN: Line protocol on interface fastethernet0/1, changed state to upswitch (config-If )#
3. Configure VLAN 2 and VLAN 3 on the layer-3 switch, and route Port 2 and Port 3 to VLAN 2 and VLAN
OverviewThe first 3 blogs about MongoDB's distributed and clustered, where the primary master-slave replication We almost do not have any meaning, the remaining two, regardless of which we use each, will have a corresponding problem, a better solution is that the collection of shards and replica sets to use, so it is more perfect.deployment Diagram Here, we need to note that we MONGOs server configured as a cluster, so we need to add the corresponding
by element id, class, and tagName.
1. $ ("# id"): id selector, document. getElementById ("id ");
2. $ ("div"): Element selector document. getElementsByTagName ("div ");
3. $ (". myClass"): class selector, which returns all elements of class = "myClass"
4. $ ("*"): returns all elements, mostly used for context search.
5. $ ("div, span, p. myClass"): A Multi-condition selector that returns all elements found
Tags: mongodbNot in the official MongoDB documentation, but is actually feasible and requires the following steps1. Install keyApt-key adv--keyserver hkp://keyserver.ubuntu.com:80--recv 7F0CEB102. Add a sourceecho "Deb Http://repo.mongodb.org/apt/debian wheezy/mongodb-org/3.0 main" | sudo tee/etc/apt/sources.list.d/mongodb-org-3.0.list3. Update the sourceApt-get
In the PHP language, for digital characters and numbers how to participate in the operation, in specific cases will be determined, for example: echo "3+4+5"; Results: 3+4+5. Because it is treated as a string. When echo1+2+ "3+4+5"
This is seen in the geeksforgeeks when a problem, very good, the topic isGiven a number system with only 3 and 4. Find the nth number in the number system.First few numbers in the number system Are:3, 4, 33, 34, 43, 44, 333, 334, 343, 344,433, 434, 443, 444, 3333, 3334, 3343, 3344, 3433, 3434, 3443, 3444, ...(Topic lin
Document directory
1. Used to disable CSS of controls
2. Used to verify the CSS of the control
3. used to hide the css of the field Div Element
4. CSS for the Table, Image, and ImageButton controls
5. CSS for UpdatePanel and UpdateProgress controls
6. eliminate unnecessary External tables
7. layout template of the wizard Control
8. Added HTML format setting options for the CheckBoxList and RadioBu
Top one
According to foreign media reports, Mozilla has finally released the long-awaited Firefox 4 beta 3 Web browser. According to reports, in terms of functionality, the Firefox 4 beta 3 browser is first available to MicrosoftWindows 7 users have a big surprise, because the browser has finally made full use of th
two number and stored in the array B, to sort a (the original array) and B array, to determine a[i=0]+b[j= (n (n-1))]=0?, if three number 22 and equal to 0, then to the result array, (guaranteed output results are not duplicated), The final output result set. See the code, write a bit messy, hope forgive me!AC Code:Four-digit and whether 0http://www.51nod.com/onlineJudge/questionCode.html#!problemId=1267given n integers, you can determine if you can choose
the SELECT clause.--(3) Easy error: Can the results of the GROUP by clause be sorted?--"Answer" it is random. If you want to sort, use the ORDER BY clause.--The display of the results of the "summarize" GROUP by clause is unordered.--(4) Error-prone: Using aggregate functions in the WHERE clause--"Summary" You can use aggregate functions only in the SELECT clause and the HAVING clause (and the ORDER by cla
Tags: mongodbAdd user error on MongoDB as follows:> Db.adduser (' User01 ', ' 123456 ');
2016-07-29t14:50:28.932+0800 E QUERY typeerror:property ' addUser ' of object admin is not a function at
(shell) : 1:4After the investigation, the reason is that in MongoDB version 3 has been deprecated adduser, changed to CreateUser.[[emailprotected]bin]$./mongo127.0.0.1:270
Algorithm training 4-3 Daffodils number time limit: 1.0s memory Limit: 256.0MB problem description Print all daffodils between 100 and 999. The so-called Narcissus number refers to the number of cubes that satisfy them and the integers for the number itself, such as 153=1^3+5^3+3
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