Question: there are multiple groups of data. Each group of data gives you several rows. You need to select several rows so that each column has only one and only one row. It is not feasible to ask questions, or whether you can find them.
Question: 1. Violent search. 2. DLX (dancing links ).
This article is about DLX. Algorithm reference white book P406 or http://www.cnblogs.com/grenet/p/3145800.html
I am talking about some meticulous things, that is,
output527389416819426735436751829375692184194538267268174593643217958951843672782965341416837529982465371735129468571298643293746185864351297647913852359682714128574936SourceStanford local 2006
Question:
It is the classic Sudoku problem.
Ideas:
Search. However, dancing links acceleration is required. The key lies in how to abstract the problem of data independence into a precise coverage problem.
We should first consider the rule of sudoku.
1.
matrix containing 0~9, if 0 at that location, to be filled
Output format:Outputs a 9∗9 9*9 numeric matrix that represents a completed Sudoku solution
Dancing links solves the problem of precision coverage, which requires the conversion of Sudoku problems into precision coverage issues.
The constraints of Sudoku: Each lattice has and only one number in each row, 0~9 each number appears and appears only once in each column, 0~9 each number appears and
, the properties that we want to ease are those three properties. The draw function of Lbitmapdata is then called in OnUpdate to refresh the display object.3, code showNow let me show you the code:Add HTML code, less than 100 lines, visible, lcolortransform with Ltweenlite to achieve color animation is very simple.Run the above code to get the following effect:Test Address: http://wyh.wjjsoft.com/demo/color_transform/Source code has been given, everyone directly copy and paste it ~Because pixel
Huawei security: dancing internationally
As "a place to talk about security", the annual RSA conference will become a benchmark for the development of the security industry. This year is no exception. As a representative of the Chinese RSA 2014 Security Conference, Huawei has its own opinions on the security industry trend reflected by this RSA conference. This will also become an important guide for the future of this local vendor.
The RSA Conferen
This year's Shanghai online game, a topic, the same as HDU 2295. Is the calculation of the distance is a Euclidean distance, one is the Manhattan distanceAfter learning DLX feel this good water, is a bare repeated coverWatch out, don't spill.#include HDU 5046 Airport (Dancing Links repeatedly covered)
Topic: given n boys and n girls, some like each other and some not. Hold a few dances, each with n pairs. Cannot have the same combination to appear. Each person can only dance with the people they don't like, ask for a few dances.Split a person into two points. Point 1 to point 2 is connected to an edge with a flow of K. Two people if they like each other, point 1 between the edge, do not like the point 2 between the edgeFor each x value to be validated, each person's point 1 to the source or s
There are n cities and M stations. You need to select K stations. Each Station draws a circle with a radius of R to cover all the cities, A city can be covered by multiple sites. This is the minimum R that meets the requirements.
The idea is obvious. The first is to divide the problem into a feasibility decision.
For mid, we regard the station as a row, and the city as a column. If the distance between a station and a city is smaller than the mid, the corresponding matrix position is 1; otherwis
HDU 2295 Radar (dual + Dancing Links), hdu2295
There are n cities and m stations. You need to select k stations. Each Station draws a circle with a radius of r to cover all the cities, A city can be covered by multiple sites. This is the minimum r that meets the requirements.
The idea is obvious. The first is to divide the problem into a feasibility decision.
For mid, we regard the station as a row, and the city as a column. If the distance between a
Given a 10x10 triangle board and 12 kinds of parts, each part can only be placed once, and can be rotated and flipped. Some parts have been placed on the top, and a solution is proposed, place 12 parts on the board without Overlap
First of all, this question is about DLX, but it is really disgusting to create a graph. We need to enumerate up to eight orientation positions for each part. At first, I wanted to process all the code, but later I found that I could not do it.
So I chose to input all
This book is a book about risk management by the famous author of man piece. In China, there are still rare books on this topic, and the books on this topic are not quite eye-catching.
Unlike other software development books, not only can software project managers benefit from this book, but also can help managers and decision makers in other industries. This book does not cover too many software development technologies or methodologies, but explains step by step why there are risks, how th
Dancing links solves the exact cover problem.
The circular bidirectional cross linked list is used.
DFS.
I read this article, found an AC source code, and used the annotation method to help me understand it.
Hit ACM
Thanks to the source code Po master. The link is as follows:
Http://blog.csdn.net/yysdsyl/article/details/4266876
# Include
Photoshop Creative Dancer's Phantom effect of dancing
Figure 00
1. Create a document
This tutorial is used by the singer MV. The video screenshots are a bit similar, but very different. Select the screenshot process, the need to expand the acquisition range to the entire video, because unless it is a special shooting, otherwise want to be in a video interval to find a big difference in the screenshot, or a bit difficult.
Step 1, the course is a
Photoshop synthetic comics girl dancing Splash effect, graphic tutorials.
1:adobe Photoshop CS3 version, first open a new file, set an undertone.
2: Draw the basic shape of the splash with black
3: In the filter in the Liquefaction function will be the spray contour correction
4: Select the splash contour, keep selection area, new open layer.
5: Brush tool with a soft brush to choose white spraying spray outside the outline, not every pl
Special Effects | stars
In this tutorial we use Flash 8 ActionScript to make dancing star animations.
First look at the effects and source files:
Click here to download the source file (decompression password: www.webjx.com)
1, first set up a new Flash document:
2, draw a star, the method is relatively simple, not in detail:
3, select the above stars (note to all selected AH) by F8 into film clip components:
4. Double-click on the newly created mo
First template-precise coverage
Question: http://acm.zju.edu.cn/onlinejudge/showProblem.do? Problemid = 3038
Why do you choose this question? Because it can be used as both a DT-independence template and a DLX template, isn't it just a one-to-one
Final effect
Material packaging micro-disk download
1. Create a new document in Photoshop and set it as follows:
2, open the forest image. Use the Move tool (V) to drag it onto a white canvas
Go to edit >
Today Sunday, not suitable to go out, too cold, Vulgar said: 1929 not shot, Sanji go.
Our application can also have some winter effect, teach everybody to do a snow animation effect, reference.
Main
(1) Hide the status bar and display the
Treasure Map Time Limit:2 Seconds Memory limit:32768 KB
Your boss once had got many copies of a treasure map. Unfortunately, all the copies is now broken to many rectangular pieces, and what do it worse, he has lost some of the P Ieces. Luckily, it'
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