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The tree-like array is also a fern tree, conceptually tree-like, actually implemented using an array, represented as an implicit data structure, Balabala ... For details, see: Https://en.wikipedia.org/wiki/Fenwick_treewhere ' i + = (I i) ' is equivalent to $2^{n-1}, N \in ... $, can also be written as ' i + = (I (i-1)) '.Code#include An example:Tree-like array

Topic Links:http://acm.hit.edu.cn/hoj/problem/view?id=1867Main topic:There is a C chain, number 1~c, there are n instructions, each store the initial number of goods are M. The next n lines are the commands.Command 0:0 x W, the number of goods in chain X changed to W,w > 0, the number of goods increased, W Command 1:1 x y, ask for the number of stores that have an "x, Y" chain of goods in prime numbers.Ideas:because the interval is large, it is done in a tree-

about tree-like arraysSegment tree and tree array in Noip I think it is very important, and more difficult to write.Let's look at the tree array first.Look at this figureThen we will find an interesting nature.Set the node number to n, then this node is governed by a range of 2k (where k is the number of n binary end 0) elements.The last element of this interval must be an.So: Cn=a (n-2k+1) + ... AnMagic Bar.Usually, our tube 2k is called lowbit (n),

Let's talk about it briefly. Japanese color is now a lot of photographers love the style, the kind of sweet and fresh and lovely feeling on the faces, but also by many young girls love, then today photographer Ahwin (micro-letter: Hanbowen) Examples to explain, the Japanese tone of the late adjustment and ideas, a look at it. Effect chart This is a relatively hasty shooting, there is no too many ideas, just want to shoot a group of campus fresh students image, so chose

Microsoft released its Windows 7 system in 2009, and the system version was well received by all. Of course, with such excellent feedback, the last version of Windows Vita is too hard to work with. Three years after the release of Windows 7, Microsoft released Windows 8 in 2012, and Windows 8, which uses the new Metro graphics interface, had a strong market conflict after the launch, and many users thought the system was too radical and too drastic. Over time, however, the user's acceptance of W

, the Windows 8 operating system introduces a new Metro interface that facilitates user touch and instantly displays useful information, which also applies to mouse keyboard operations. And for operational and optimized performance, Windows 8 has made significant progress in terms of performance, security, privacy, and system stability, in addition to Windows 7, reducing memory footprint and providing more space for your applications. This means that Windows 8 compatibility has been

GIF file: PNG source file: "University four years of remembrance-the grass-like age" Work format: GIF animation Creative reasons: To commemorate the grass-like college students live Introduction: The grass cycle of the base students Express University four years decadent in the ideal life state by RockHward2007.7.12 1. Preparing elements for animation In this s

For example, the player has thunder to see (while watching the next movie), Baidu Audio and video (many new movies online to use), Storm Audio (old player, one) and so on, input method This peacetime use the most tools of course is no exception. Small knitting computer has Engkoo Input method, Google Input method, Sogou, QQ, Baidu Input method and so on a series of input methods. Usually use the most or Sogou input method (mainly small series like th

The internet is changing from a space based model to a time based model, as the Twitter message stream and the Facebook timeline reflect this trend, the Wired magazine said earlier this year. "The future of the Internet time stream will be like a diary of the continuous rolling, recording every message in your world, when you touch her, she stopped, you can continue to read, search, in and interact with friends." ” China, China's portal has not used

Main topic:Give you a sequence of length n, and then you have the following actions:Q: Query the and of the [x, Y] interval.A: For A[x]+yS: For A[x]-yE: End QueryProblem Solving Ideas:Because n is large, the number of inquiries is also very large, the worst case is that whenever I do a or S, I do a q, such a complexity is n*m,,, will definitely t, then we need to solve the problem of query and modification in the Logn time, think of course is the use of tree-

Atitit. Java and php comparison : Why big businesses like Java and not PHP1. Main reasons::php is " low-tech, low-cost, low-quality personnel use " of the three low weapons 12. Features of the three low weapons (so-called merit) 22.1. Simple Operation 22.2. Simple and reliable structure 22.3. Low Price 22.4. Low logistic support requirements 23. Programming language features used by regular armies 23.1. High Performance 23.2. Powerful 23.3. Can face

or the interval summation interval modification problem, we use the segment tree to solve later found that the programming complexity of the largerHere is an introduction to a simple data structure, a tree-like array.The advantage of a tree array is that the programming complexity is small, the constants are small, and the time complexity is good.Tree-like array of queries, modifications, are log (N) level　

The background of the story is this, a set of projects, the server is written in C #, in order to accomplish something, it needs to use a component, this component is very small but very important, unfortunately, this component is written in PHP language, If you build a PHP environment specifically to use this component, it looks like a bit of flak (and other unforeseen resistance). Perhaps some readers will come up with a "protest": not PHP write, di

brain all turn the program, they are not more dedicated, but like, enjoy the fun of programmingone of the procedures that Daniel once said:"I have been in this business for 15 years, met a variety of programmers, whenever I want to nine late five, feel tired and not interested, deserve you only take 5K." ”/03/you're only one step away from the dream.Countless people choose the program ape, in fact, there is a fundamental reason, pay highBeijing Price

1, explore the app to open the interface after we click on the interface of "personal data", and then you can view the information, of course, we can also click on the right side of the "show off" to share to friends Circle so that small partners to see their charm; 2, explore the current is unable to see who likes themselves, can only see a few like you, but can't see the specific like who is, and onl

I sometimes think that when I say others are selfish, someone is saying I am selfish. When I say someone is mean, someone is saying I am stingy. I don't want to argue about it. Arguing will only consume too much of your energy. Natural selection, survival of the fittest. With their own strength to go to the fighting on the line. No nonsense. Do it generously, and pay no ink. Everything to see value. One, no argument. Since then I have not been arguing. Nor weak, weak, not only to one person, bu

Css Most Soyi electronic magazines use a tree-like directory, when the mouse clicks on the home directory, expand the subdirectory, when clicked the home directory again, close the subdirectory. It is simple, neat and unadorned. There are many ways to make this kind of tree directory, recently I use CSS to easily control the object's "display" and "hidden" attribute principle, also make a, I feel the use of CSS to make such a tree-

1. Overview A tree-like array (binary indexed) is a novel array structure that can efficiently obtain the number of consecutive n in an array. In a nutshell, a tree array is often used to solve the problem that elements in the array {A} can be constantly modified and how to quickly get the sum of several consecutive numbers. 2, tree-like array of basic operations The complexity of the element modification

Hello everyone, I am a stone. In the process of doing Business station optimization, there will always be some difficult problems, such as the common old station optimization, the keyword ranking is always like a roller coaster, very unstable. Today's ranking is the first three pages, tomorrow may fall to 100, the gap between the two may be dozens of, such a situation let us these seo people very egg pain, but it is difficult to find the real reason,

is not attractive enough, too common, or no actual what he needs, but anyway, Users in the site after the departure is not a good thing, at least your site is not affected by the user's likes, there are many imperfect places, need to amend. Conversely, if users enter your site after browsing a lot of pages, and stay longer, then you should celebrate, nature shows you user experience this piece to do well, can hold the user needs. How is the user returning? The user is through the search engin