The military-industrial scientific research system of the academic master.

Chang Haonan really struggled for a while about what program to run on China's first supercomputer operated by a university.

What he is best at is of course programming to calculate numerical solutions to partial differential equations, which is the essence of all numerical analysis and computational simulation processes.

But on the one hand, this kind of procedure is generally complicated. On the other hand, it is impossible for all those attending the ceremony to be industry insiders, and outsiders will definitely not be able to understand it, and they may not think that this kind of thing that will output a bunch of dry parameters in the end is very powerful.

So he finally decided to think differently.

The most simple way is to run a hello world to solve the problem.

This is the first demonstration program in the book "C Programming Language", which is extremely classic and can be called the programming bible.

Affected by this, almost all programming teaching around the world will use the output hello world as a starting point for students to get started.

Any programmer may not use C language or may look down on C language, but he has basically written a program with similar functions.

However, in 97, computers had not yet become a required course for college students across the country, so basically only experts knew the ins and outs of it.

Even if this program is written in assembly language, it only takes about twenty lines, and high-level languages ​​​​such as Java and Python (Note 1) can be completed in one line.

Simple and powerful.

Experts will only smile knowingly when they know you are making fun of it, and will not dislike the simplicity of this program. However, although laymen do not understand it, but just from the perspective of watching the excitement, they will also feel that this is very consistent with China's current development theme towards the world. .

very perfect.

Chang Haonan, who finalized the plan, quickly wrote a simple unveiling ceremony process and handed it to Tang Lintian based on his previous life experience -

Although Du Yishan has always been in charge of this matter with Chang Haonan, if it really comes down to the administrative work of providing money and people, it would still have to be handled by Dean Tang.

As for the details after the general framework is in place, Chang Haonan does not need to worry about it.

Although it is not yet possible for the school to assign him a secretary in a big way, there will always be someone responsible for these things.

According to the original plan, in the next three days, Chang Haonan only needs to prepare a slightly more formal suit (paid for by the school, of course), and then read the script of his speech on the day of the unveiling, so as not to get stuck on the spot or read the wrong words into the script. .

As for the rest of the time, I mainly worked with Fang Zhen to optimize the design of the stratospheric airship that was developed with Zhejiang University.

Of course, nowadays, Chang Haonan no longer needs to do this kind of work himself. He only needs to give some pointers on the key points of the algorithm.

Although it has only been a short year since rebirth, many people's abilities and destiny have been changed by Chang Haonan.

Just like Fang Zhen, at this time last year he couldn't even figure out the dipole grid analysis of a beam-type wing. But this year, although it seems that Chang Haonan and Yao Mengna are falling further and further behind, they have actually already fallen behind. He has become one of the top experts in aerodynamic analysis and optimization.

Otherwise, Zhejiang University would not have crossed half of China to find him as an airship.

This feeling, for a person like him who has experienced two lives, is simply not very pleasant.

Five o'clock that night.

"Brother, please be busy first, I'm going home."

Chang Haonan looked at the wall clock on the wall and confirmed that it was time to get off work. He quickly closed the lid of his laptop, stood up, put on his clothes and prepared to leave.

Taking advantage of his free time these days, he had to experience what it was like to work a nine-to-five job that he had never experienced in his entire life.

"it is good……"

Fang Zhen just raised his head and said a word. Before he could say a few words, he heard a knock on the office door.

Then a timid voice sounded outside.

"Hello, is Teacher Chang Haonan here?"

This sentence stunned Fang Zhen, Chang Haonan and Xia Tian in the office.

Then they all looked towards the door.

Three people, two men and one woman, were standing there.

Judging from the fact that he is similar in age to Chang Haonan and Xia Tian, ​​he is much younger than Fang Zhen.

They should all be students.

"I am Chang Haonan, but I am not a teacher yet."

Although he was a little curious about the purpose of the visitor, he still put his clothes on the back of the seat again.

In any case, getting off work on time is basically hopeless.

"You are looking for me..."

Perhaps it was Chang Haonan's answer and his too young appearance that made the three visitors a little at a loss. After about ten seconds, the girl who first knocked on the door opened her mouth to explain again:

"Ah... we are students from the Department of Computer Science and Technology of Yenching University. We are here to ask you for advice on the universal application of differential evolution algorithm (DE) in constrained optimization problems. This is the problem between the three of us. Student ID card, and this, a statement written by Teacher Yang Fuqing for us, stamped with the college seal..."

The three people took out a lot of documents and information at once.

He even caught a glimpse of two Panda cigarettes, which were very popular in this era, in the bag of one of them.

It is estimated that it was originally intended as a gift for "Professor Chang Haonan", but his real age is obviously slightly different from the expectations of the other three...

Chang Haonan didn't care much about this, but if the other party really wanted to show it, he didn't know what to do with it, so he pretended not to see it and directly took the other party's ID and the letter explaining the situation.

"Yan Da..."

It must be admitted that Beijing Airlines and Yanda are not schools at the same level.

The former is of course very important in the aviation industry system, but no matter which country it is in, industry and academia are two separate circles, and the former is generally at the lower end of the contempt chain.

So Chang Haonan was a little happy to meet three Yan university students who came here to ask for advice.

Because he suddenly had a bold idea.

Since the fate of many people and projects has been changed because of him.

What about schools?

Now there is only one year left until May 98...

Who says the C9 league can't become the C10 league?

……

The girl who has been talking among the three is called Lin Zhi, and the other two boys, one tall and one short, are a bit taciturn. The tall one is named Song Tingyu, and the slightly shorter and fatter one, who looks a bit like Wu Yifan, is named Jian Feiang.

They came here because they wanted to participate in this year's International Competition on Evolutionary Algorithms (ICEO) in Indianapolis.

Yang Fuqing, who wrote this note, should be an academician with qualifications close to Du Yishan, but neither she nor the three students specifically mentioned this, probably because they were afraid of being misunderstood as using the name of an academician to pressure others.

"This competition...if it were overseas, I would definitely not be able to attend..."

Although it was not stated explicitly in the letter, it could still be seen from the meaning between the lines that Yang Fuqing seemed to want to directly ask Chang Haonan to be their instructor.

Normally speaking, this kind of job of leading a team to compete abroad is definitely a good job. Not only can you go abroad for a tour at public expense, but if the students you lead get good grades, it will also be a huge bonus for the teacher.

But Chang Haonan's situation is special after all. Whether it is from the perspective of confidentiality or safety, the organization will not let someone like him go abroad casually, and he himself is not worried about the situation on the other side of the ocean.

"Is this...Teacher Yang said before coming here that if you have something to do and can't leave, you can just use the name of the instructor."

Judging from Lin Zhi's reaction, Chang Haonan is 80% sure that this was her own temporary thought. However, in most cases, such competitions only require the presence of instructors, but not all of them.

"Okay, let's talk about your specific problems."

Chang Haonan has completely given up on the idea of ​​going home from get off work.

"That's right. In May last year, that is, before you published that paper, DE had already achieved good results in the first ICEO held in Nagoya. There were five test functions at that time, namely the ball model f (x)=∑(i=1.n)(xi-1)^2, xi∈[-5, 5], classical Griwank function (Note 2)..."

When talking about professional topics, the short Suga Feian changed his slightly dull look before and stepped forward to fluently introduce to Chang Haonan the situation of the first competition last year and the expected results of the second competition this year. Involved directions, etc.

Among the three bags of information they brought, there was a box of floppy disks containing the complete algorithms submitted by all the contestants last year.

"Um……"

Chang Haonan inserted a floppy disk into the floppy drive.

Taking advantage of the time of reading the market, he casually asked the question that he was a little curious about just now:

"Why do you think of coming to me? And the proposer of the DE algorithm should be at Berkeley. Are you so confident in defeating their local students?"

The two men and one woman looked at each other, with strange smiles on their faces.

"often……"

"Just call me Chang Gong or Dr. Chang."

"Dr. Chang, although Professor Stern and Professor Price are indeed the fathers of the DE algorithm, after all, they are only preparing to determine the coefficients of the Chebyshev polynomial. It is you and Researcher Xu who really popularized this algorithm. , so now in the industry, especially in the circle where we are preparing to participate in the second ICEO, you are generally called the godfather and godmother of the DE algorithm..."

This answer almost made Chang Haonan stunned.

Good guy, have I become a godfather?

1: These languages ​​are called high-level languages ​​just by convention, and it does not mean that they are more powerful than assembly language and machine language.

As the saying goes:

After learning real variable functions for ten times, I feel disheartened by functional analysis.

The random process is random, and assembly language cannot compile.

It can be seen that assembly language is still difficult to learn.

2: Original test question: