# how to solve difficult sudoku

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### Use a two-way cross-linked list (or dancing links) to solve a Sudoku game

#include If the previous level is not enough, I wrote a program for solving the sudoku without any optimization. Now we can improve the level and learn how to use a two-way cross-linked list to optimize the time complexity to solve the sudoku game. Instead of using it directly, we must convert it into a "precise coverage model ". Why? I tried to write a program

### Java using backtracking method to solveSudoku example _java

]){return false;}if (k = = matrix[3*m+p/3][3*n+p%3]){return false;}}return true;}/*** Print Solution Time* @return*/Public long Printtime (){return this.timeafter-this.timebefore;}/*** Print Matrix*/public void Showmatrix (){for (int i=0; i{for (int j=0; j{System.out.print (matrix[i][j]+ "");}System.out.println ();}System.out.println ();SYSTEM.OUT.PRINTLN ("Solution Time:" +printtime () + "millisecond");System.out.println ();}public static void Main (string[] args) {int matrix[][] = {{3,0,6,0,5,

### Java implementation to solve the world's most difficult nine problem _java

The Finnish mathematician has spent 3 months designing the most difficult Sudoku game in the world to date, and it has only one answer. Carla says only the fastest-thinking, smartest-minded person can crack the game. Today, a Tencent news that the Chinese old man three days to crack the world's most difficult nine Sudoku

### Why is the supply chain problem so difficult to solve?

If you already understand the value of supply chain management to your business, and learn how to The CRM system manages the supply chain so you can see why the supply chain problem is so difficult to solve. 650) this.width=650; "Src=" Http://s5.51cto.com/wyfs02/M00/85/8E/wKiom1eoTF7BrAPFAADZpEa9xek997.jpg-wh_500x0-wm_3 -wmp_4-s_895073130.jpg "title=" Why is the link line CRM system: Supply chain issues so

### Difficult to solve the problem section in algorithm path

Difficult to solve the problem section in algorithm path This is a good book, including the string of data structures and the philosophical principles of operating systems. This book can be regarded as a simple example. The article is very good, and the author adds a lot of his own ideas. This article includes the hard-to-solve part. Chapter 2 ease of solutio

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### Difficult to solve the food and beverage industry trends downward Trap

In recent years, this term is more and more common, we can not only in the IT related information column to see its presence, and even in some comprehensive news page can be easily seen.True. Offline business combination of online drainage Such a method, can bring a lot of orders, but whether it can solve the food and beverage industry trends down the trap? I find it very difficult. After all, when an econo

### Use abstract Factory mode to solve tight coupling and difficult maintenance problems in legacy code

, implementation code and test reports to the PLM manager to review, after approval can be published to the formal system.Before, the European Enovia consultants (those consultants are very advanced, but do not seem to pay attention to OO design, entirely in accordance with the process-oriented thinking to write code) in order to try not to create new Java classes, the Pojo, interface and factory method implementation are all written in a class, now with the increase in business code volume , we

### Programming problems are difficult to solve, learning to ask questions is the key!

to writing a blog for the rest of the world, you can write a letter to your toy duck, which is a good listener.This article is selected from the "Road Programming", click this link can be viewed in the blog point of view website.650) this.width=650; "Src=" http://img.blog.csdn.net/20170109151150224?watermark/2/text/ ahr0cdovl2jsb2cuy3nkbi5uzxqvynjvywr2awv3mjawng==/font/5a6l5l2t/fontsize/400/fill/i0jbqkfcma==/dissolve/70/ Gravity/southeast "alt=" Picture description "title=" "style=" Border:0px;

### [Algorithm Programming] It is difficult for a doctor to solve a primary school mathematics problem, but for a primary school mathematics problem.

[Algorithm Programming] It is difficult for a doctor to solve a primary school mathematics problem, but for a primary school mathematics problem. Yesterday, I learned from the science internet that this news, "Doctor of mathematics in Vietnam's primary school is difficult." It is reported that the question came from the three-year class of Paul's primary school

### The installation of Fedora8 encountered a very difficult problem. Let's take a look at how to solve it?

The installation of Fedora8 encountered a very difficult problem. Let's take a look at how to solve it? -- Linux general technology-Linux technology and application information. For details, refer to the following section. Install Fedora8 on the XP system through hard disk Hardware: Notebook ACER4520G 1 GB memory, 120 hard disk. 1, I downloaded the Fedora-8-i386-DVD.iso in drive C, with PartitionMagic 8.0

### After mysql use db, it is very difficult to solve

After mysql use db, it is very difficult to solve a mysql instance that you usually use. After using db, it is always very difficult to press Enter. It takes 1 s to return the result. I think there is something strange, I opened the general log and found that the simple use test, mysql actually executed a lot of content: SQL code 130603 16:02:11 2 Query SELECT DA

### A difficult problem to solve

A difficult problem to solve: Delphi/Windows SDK/API Http://www.delphi2007.net/DelphiDB/html/delphi_20061215131443292.html The two tables are connected with query1, query2 performance1, and performance2 dateset1 and dataset2 respectively. The datasourece attribute of query1 is written as performance. Why? After I modify the table structure, I cannot find the added field in the grid. Is this caused? I have

### LoadRunner solve the difficult problem in the project

The code is as follows:Vuser_init (){Lr_save_string ("11041331\", \ "11041372\", \ "11041373\", \ "11041374", "OrderNo");Lr_output_message ("%s", Lr_eval_string ("{OrderNo}"));return 0;}Action (){int i=0,j;Char temp[100];Char orderno[100]= "11041331\", \ "11041372\", \ "11041373\", \ "11041374";Char *p[20];Char *buf=lr_eval_string ("{OrderNo}");Char *buf=orderno;while ((p[i]= (char *) strtok (buf, "\", \ ""))!=null) {i++;Buf=null;}Buf=null;Lr_output_message ("Total divided into:%d strings", i);f

### When I write my thesis, I solve the problem that the horizontal line and carriage return are difficult to remove in the contents of the header and footer.

First, there are two ways to delete the horizontal line in the header, which is illustrated in more than 90% of the web. I'm not detailing it, just a brief explanation.(1) way, there are two kinds of(2) modeSecondly, for the deletion of the carriage return symbols in the header and footer, most of the online methods are irrelevant. One of the methods given below is relatively more reliable, but it is cumbersome to implement.Reference articles1. If the water, http://www.360doc.com/content/10/0531

### What is the logic error that is super difficult to solve? Urgent

What is the logic error that is super difficult to solve? Urgent: Delphi/Windows SDK/API Http://www.delphi2007.net/DelphiDB/html/delphi_20061222173752156.html My Program DBGrid, adoquery, next record, last record, and delete current record are displayed on the panel. DBGrid is empty when the program starts, click any one of the buttons above, and the program reports an error and exits. Take the "delete" b

### Solve the difficult regular expression !!!

Solve the difficult regular expression !!! You have obtained the HTML of http://www.autohome.com.cn/77/options.htmlthrough curl. if so, you will get the next part of html? Thank you!

### JS the same tag randomly switching data a la carte-solve the choice of difficult disease

Visualization of"en"> "UTF-8"> "span">class="Box"Id="Box">"Button"Id="btn"Value="Roll Call"/> View CodeMethod Two:"en"> "UTF-8"> "Center"> "Button"Value="Start Ordering"onclick="students ()" class="KS"/> "Button"Value="Stop Ordering"onclick="Stop ()" class="KS"Id="Nu"/> "Blue"> "Div1"align="Center"> Random à la carte area View CodeJS the same tag randomly switching data a la carte-solve the choice of difficult

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