Blue Star Sea Diamond

Liu Hui began to write books on cluster control, and he planned to cooperate with Wu Ren's communication control team to make a real cluster in the real world.

Liu Hui found 10 drones, each with 4 fans, installed the communication and dialogue devices of these 10 drones, and adjusted them smoothly.

The ground station is responsible for controlling these 10 UAVs. The ground station can not only send signals to 10 UAVs, but also can use the signals to detect the positions of 10 UAVs.

After Liu Hui numbered the 10 UAVs, he could successfully control each UAV to fly by means of a chain. He also wrote a program to measure the relative distance based on the connection of the communication system between the UAVs. The absolute position relative to the ground console was also measured.Liu Hui's computer can display the coordinates of the drone's location.

As Dong Jiuyi said, although the one-dimensional method is simple, it has drawbacks. Sending commands from the head to the tail can easily cause information transmission to be blocked if it is too frequent.

However, if it is a leapfrog transmission, 10 drones can barely handle it, but if it reaches more than 20, the amount of calculation will be large, and it is difficult to find the most optimized method in a short time.

This is the PNP problem. It is a mathematical problem. It describes whether extremely complex calculations can be simplified. It is one of the seven major problems of the millennium proposed by the Cray Institute of Mathematics. No one can solve this problem so far.

Liu Hui simulated the program, started with C language, generated a random position for 10 drones, and then easily calculated the distance between the aircraft and the aircraft, there are already 100 numbers.To control the flight of the cluster is to add the same amount of motion to each drone speed, so that the cluster can move in translation.To turn the cluster into a formation, use one as the benchmark, and then use the sorting method to arrange each drone according to the calculated position.

The clusters need to observe the target, and each cluster needs to be equipped with a camera. After taking pictures in one direction and area, send the photos to Liu Hui’s computer. Each photo must be marked with coordinates, and the software should be combined according to the overlapping area. , And then a big photo appears.The principle of photography is the same.For photos in other directions, the direction information can be recorded, and the panoramic area can be stacked to obtain more comprehensive information.If SAR radar is used for sweeping, the principle of phased radar can be used to perform over-the-horizon detection.

According to this principle, Liu Hui made a cluster of 10 drones and tested it on campus to detect the powerful performance of this cluster and found that it can be done with ease.

But when Liu Hui managed to reach 13 times faster, he found that it was difficult for this kind of cluster to find the optimal solution in the algorithm, so it was easy to lose control and become confused.

Liu Hui attributed this to a PNP problem and addressed it in an academic report meeting.

This time, many people at the level of mathematics, physics, and engineering who listened to the report were interested in Liu Hui's cluster.Many people raised various questions about Liu Hui's report.

A classmate from the Department of Mathematics began to ask Liu Hui a question: "Hello, my name is Wu Jun. I have heard about you, and I am very interested in seeing your report. I want to ask, what is the maximum number of your clusters? One?"

Liu Hui said: "I got 13 of them, but they were not very successful. You see, they are not stable."

Wu Jun said: "I mean, if you can succeed, how many will you get?"

Liu Hui said: "The more the better!"

At the meeting, both the teacher and the students laughed.

Wu Jun said: "It makes sense, even infinite is possible, right."

Liu Hui smiled and said, "If it can be done, of course it can."

Wu Jun said: "One, ten, fifty, one hundred, ten thousand, one hundred million are not the same, the algorithm will definitely be completely different."

Liu Hui said: "Yes, it must be completely different."

Wu Jun said: "Then solve it according to the infinite number of thinking, but it is not simple?"

Liu Hui said with interest: "What do you mean? How to solve it according to the infinite number?"

Wu Jun said: "If you think about it, the value of the cluster is that as many as possible, even astronomical numbers beyond our imagination are all possible, right?"

Liu Hui said: "Well, I haven't thought about it, but what if we solve it according to the infinite number?"

Wu Jun said: "I'm sorry, I have too many things in my mind, and I can't say it for a while. I will tell you when I have the result. I am a little incoherent."

Liu Hui said: "It seems that you are really interested in this matter."

Wu Jun said: "You attribute the calculation problem of the control cluster to the PNP problem, but have you read the recent news that a mathematician in Bei'an Steel has solved the PNP problem, and maybe you can control your cluster? It will help."

Liu Hui said, "Do you have his paper?"

Wu Jun said: "I have to look for it. It seems to be from Bei'an Gangyu, I haven't seen it yet."

Kong Qiuming interrupted the conversation between the two and said to Wu Jun: "You have a problem, let's talk about it below, I still have a problem."

Liu Hui said, "Teacher Kong, please tell me."

Kong Qiuming said: "If your cluster is really endless, can it occupy this world, or even the entire universe?"

Liu Hui froze for a moment, feeling that what Kong Qiuming said might happen.

Kong Qiuming said: "Then maybe everything will become a cluster, just like routing in the Internet, which can directly transmit information, communicate and send information to each other. Is it just a large blockchain?"

When Liu Hui heard it, he fell into thinking.

Kong Qiuming said: "If everything in the world is clustered, and different types are only different in attributes, but they can communicate with each other, then the only thing between yours and mine is to distinguish them by passwords."

Liu Hui nodded.

Kong Qiuming said: "If all this is really so unavoidable, then the study of cryptography and error-correcting codes and other coding theories is an extremely important issue. If the enemy or an outsider cracks what should belong to us, then we You will lose your property, so the password must be very secure."

Liu Hui said to Kong Qiuming: "I didn't expect Teacher Kong to have such a deep insight into this matter. Although I am only doing simple control, it is difficult to tell what the future cluster will become."

Wu Jun said: "According to Mr. Kong, the core of the cluster theory is cryptography. Even if it is used in the military, it must have a password that can protect oneself and break other people's passwords. Existing passwords There are several types of agreements. It seems that we have to learn the principles and create new encryption capabilities. The country or the company needs to have strong cryptographic capabilities to control their own property. That is the difference between protection and plunder. It’s just a war between passwords."

Ye Jun found a list of masters from all walks of life in "Sand Table Deduction", and invited all the masters on the list to hold a tea party in a large classroom of Northern University.