how to solve hard sudoku

#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

What should I do if a hard disk error occurs after GHOST is restored? How can I solve the hard disk fault after GHOST is restored?If you use GHOST to restore the system to 99% for a long time without response, you can recognize the hard disk by restarting the self-check. However, you cannot enter Windows PE or DOS, and

computer does not read hard drive how to solve Computer does not read the hard drive the reason and the solution one: The hard drive is not detected by the computer. 1, in fact, can not detect the hard disk is not only the motherboard or

Computer does not recognize the solution of mobile hard disk: Method One: System-related Setup problems 1, do not think that as long as the motherboard has a USB interface can use the mobile hard disk, but also depends on whether the system support. Windows2000, Windows XP and the above version of the system can directly support the mobile hard drive, no need t

computer does not recognize the mobile hard drive how to solve The computer does not recognize the mobile hard drive solution one: USB connector not open: On some old machines (including some brand-name machines) Although there is an external USB interface, but in the BIOS is the default shutdown, so even if the system support is not, so you should check the BI

Computer hard drive loud how to solve One, hard drive bad road This is the most common cause of a hard disk squeak, and in many cases the hard drive is broken, which can be cleaned up by a disk Cleanup program or other proprietary software to fix it. Second, mechanical

The use of computer friends on U disk and mobile hard disk will not be unfamiliar, but in the use of mobile devices we will encounter such or such problems, such as the more people ask the mobile hard disk does not show the problem, how to do? At present, most of the mobile drives we use are USB interface, Plug and Play type, similar to U disk, we often use USB devices are also likely to encounter unrecogn

The essence of "the path of algorithms" is hard to solve.Difficult to solve the problem section in algorithm path This book is written by Yan hengming, the author has another book, "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 incl

. Although you limit the hard disk space used by each user, multiple users work together on one shared folder, which can also make the size of the shared folder extremely huge, which is also very insecure. Therefore, limiting the amount of hard disk space occupied by each folder can also enhance the security of data files and reduce the number of times data files are damaged by humans or viruses, the "Space

How to solve the problem of automatic shutdown of Windows 7 dual hard disks with the rapid decline in hard disk prices, there are more and more friends using dual hard disks. Generally, one of them is used as the system primary disk, and the other is used as the slave disk storage file. If you are using Windows 7, you

"compress files to save space" index files to speed up search 5. Close Windows Search service. 6. Close SuperFetch Service Workaround 2 "About" Vista use, hard drive lights will always flash "solution Many friends install Vista, after the boot will appear a long time hard drive lights flashing phenomenon, and the computer has become very slow, open the "Process Manager", CPU utilization is not very hi

Solve the issue that CentOS 7 installation and startup of HP ProLiant DL380 G5 cannot recognize hard disks 1. Preface The installation and startup of HP ProLiant DL380 G5 CentOS 7 cannot identify the hard disk. The author solved the installation problem by referring to the original article. 2. Practice 2.1 Identification of system installation

User consultation: Boot display unknown hard error, how to deal with? To solve the problem: everything has a cause and a cause, must be told what to do before, in order to correctly judge. 1, this error prompted unknown hard error, also accompanied by a blue screen stop code 7B, according to experience, must be related to ha