the next day.
After finishing the class, Wang Donglai went directly to the computer room because today was the time for Yang Wanpeng to guide the modeling training.
In the computer room, when Wang Donglai arrived, Liao Qingfeng had already sat down, but Ye Fei was the only one who hadn't arrived yet.
Seeing Wang Donglai, Liao Qingfeng had a complicated expression, but he didn't say anything.
Wang Donglai naturally didn't say anything, nodded and sat down.
Not long after, Ye Fei walked in with a smile on his face and greeted the two of them enthusiastically.
"Dong Lai, is it okay if I call you like this?" After Ye Fei sat down, he took the initiative to talk to Wang Dong Lai.
"No problem, what's the matter, senior?" Wang Donglai could naturally tell that Ye Fei was in trouble, so he asked directly.
"It's okay, it's just that I read the paper you wrote after I went back. I really didn't expect you to have such a high level of computer skills. Let's discuss it together when we have time."
Ye Fei's smile was sincere, full of a pursuit of technology, just like a programmer seeing a good program.
When Wang Donglai saw Ye Fei's appearance, he guessed what Ye Fei was thinking after just a moment's thought, and replied with a smile: "No problem!"
Seeing Wang Donglai and Ye Fei chatting heatedly, Liao Qingfeng looked a little embarrassed on the sidelines.
Fortunately, at this time, Yang Wanpeng came.
"Okay, as usual, I will give you a simple question today. You can try to solve it here in the shortest time."
After finishing speaking, Yang Wanpeng asked again: "By the way, have you made arrangements for the division of labor?"
Upon hearing this, the three of them looked at me and I looked at you, but did not answer Yang Wanpeng's words.
Seeing this, Yang Wanpeng didn't know that the three of them had no division of labor at all, so he immediately said: "Since there is no division of labor, let's make a decision now."
After receiving the order, Liao Qingfeng took the initiative and said: "Well, I'm from the Department of Mathematics. I'll do the modeling. Ye Fei will do the programming. Wang Donglai will write the thesis and defend it. It just suits the strengths of each of us. How about it?"
Ye Fei did not speak, but looked at Wang Donglai first.
"no problem!"
Wang Donglai now has the ABC conjecture proof process and is busy, so naturally he won't care about this matter.
What's more, three people are indispensable in the modeling competition, and writing a paper is not an easy task. You still need to have a deep understanding of modeling, otherwise you won't get high marks from the judges.
"I don't have any problem either!"
Ye Fei followed Wang Donglai and expressed his stance.
"Okay, in that case, let's take a look at this question."
Regardless of what happened to the three of them or how they arranged it, Yang Wanpeng directly turned on the projector, found a question, gave a few words of advice, and asked the three of them to do it.
The topic is not complicated, it is about airline crew optimization scheduling problem.
An airline with 100 aircraft has a crew of about 5,000 to 7,000 people.
Not only that, there are restrictions on various laws and regulations, international conventions, government regulations and company interests.
In addition, we need to consider work-rest balance, crew preferences, team members traveling together, training, timeliness and vacation, etc. The three types of crew cannot be used interchangeably, so if you want to schedule, you need to consider many factors and then make the final decision. Good solution.
This question relies mostly on the knowledge of operational research applications. If someone who doesn’t understand it sees this question, they will feel confused and have no idea how to answer it.
However, the three of them were all smart people. With Yang Wanpeng's previous suggestions, they quickly found a breakthrough.
As long as this kind of problem can be transformed into a mathematical problem, it is equivalent to half of the answer.
The reason why it is half is because the other half needs to be solved. If it cannot be solved, it can only mean that the level is not enough, or the converted mathematical problem is wrong and has no solution.
Liao Qingfeng was selected because he naturally had two skills. It took him about forty minutes to solve the problem through the network flow model and the column generation method.
Liao Qingfeng's dense calculation process was written on the draft paper, which proved his strength.
After Liao Qingfeng completed the modeling, Ye Fei quickly turned on the computer and started programming.
Obviously, when Ye Fei said that he had come into contact with SAS before, he was not just talking about it. He used it extremely smoothly, and he felt quite comfortable and able to do whatever he wanted.
Wang Donglai watched this from the side and couldn't help but nodded secretly. With such teammates, he could relax a little.
With the combined efforts of the two top students, this problem was solved.
"Not bad, not bad. It took two and a half hours. I'm still qualified. But you still have to write a paper. Wang Donglai will depend on your speed and level."
Yang Wanpeng watched several people busy at the side, and couldn't help but comment at this time.
“It’s no problem to leave the paper to me!”
Wang Donglai said something and quickly started writing on the computer.
Not mentioning basic issues such as the format of the paper writing, even if the paper was to explain the principles of modeling, Wang Donglai did not pause and wrote the paper in one go.
Ye Fei and Liao Qingfeng originally stood behind Wang Donglai, preparing for Wang Donglai to have questions that he didn't understand so that they could explain them out loud in time.
However, when they saw Wang Donglai's extremely smooth paper appearing on the computer screen, their eyes changed from satisfaction, appreciation, shock, to solemnity at the end.
The two were somewhat shocked to find that Wang Donglai knew their work very well.
In other words, Wang Donglai can do both of their jobs.
To put it simply, Wang Donglai is omnipotent. He does not need teammates and can complete modeling, programming, and paper writing and defense all by himself.
What both of them could see, Yang Wanpeng could also see, so he looked at Wang Donglai with increasingly satisfied eyes.
Half an hour later, they finished writing the paper, which also announced that the three of them had solved the problem.
Yang Wanpeng stepped forward and inspected it carefully. He nodded with satisfaction and asked some questions.
After the comments, Yang Wanpeng continued: "You three have different majors, and rarely meet together on time. I won't do the following intensive training for you. I have selected some questions here. Just try to do more and become more proficient. If you have any questions, you can send me an email or come to my office. When the competition is about to begin, we will focus on training."
Hearing what Yang Wanpeng said, Wang Donglai was quite satisfied. Through the case just now, he also saw the level of Ye Fei and Liao Qingfeng, and he recognized it.
Being able to separate and review separately is perfect for him.
He could just take advantage of this time to chew up the ABC conjecture.
He could still tell which one was light and which was serious.
After they separated, Ye Fei and Liao Qingfeng looked at each other. Ye Fei said with emotion: "The waves behind the Yangtze River push the waves ahead, how fierce my junior is!"
"Not always!"
Liao Qingfeng showed a hint of dissatisfaction, retorted, and left. Looking in the direction, it was the library.
