Chapter 40 Going to Qinghua to attend class

The first phase of selection for the national training team lasted nine days. After the opening ceremony, there were exams in the mornings for the next two days, followed by lectures and explanations and analyses of the test questions.

After two rounds of competition, about fifteen students entered the second stage.

Finally, six players were selected for the national team.

Participate in the 44th International Mathematical Olympiad held in Neon Tokyo in July.

The layout of the training selection examination room is similar to that of the finals. The official training team members and the women's national team take the exam on the same floor, while students who register to audit the exam take the exam on another floor.

After Xu Yuan and Lin Haoming finished looking at the examination room, they planned to walk around the campus after free time.

After all, I still have to study for the exam in the afternoon.

The two had just come down the stairs when a boy with a camper ID suddenly passed them from behind and blocked their way. He was thin and wore a pair of narrow-framed glasses. However, judging from the smile he was trying to put on, he had no ill will towards them.

"You must be Xu Yuan."

"My name is Liu Yang. If nothing unexpected happens, we will be alumni in the future."

When Xu Yuan heard the name, he looked at the other person and felt that it sounded familiar, as if he had seen it before.

After a little thought, I suddenly remembered that the Liu Yang in front of me seemed to be the second place in the gold medal final.

Because the name is right below his, the impression is a little deeper.

If he remembered correctly.

The other party seemed to be a student from Qinghua Affiliated Middle School.

His mind was working rapidly, and Xu Yuan immediately stretched out his hand to greet him.

"Hello."

"I have also applied to the Department of Mathematics at Qinghua University. Maybe we can be assigned to the same dormitory." Liu Yang said to Xu Yuan excitedly.

Lin Haoming beside him looked admiring: "Those who dare to choose mathematics as their major must be very talented."

"Actually, math is pretty simple. Just choose it if you like it."

Liu Yang looked at Lin Haoming and replied with a smile, then extended an invitation to Xu Yuan and the others.

"How about I take you around? I'm familiar with this place."

Of course Xu Yuan would not refuse a free guide and agreed without hesitation.

"Okay."

At this time, Lin Haoming, who was two people behind, was still thinking about what Liu Yang said.

Being able to explain mathematics so simply and casually made him feel a sense of familiarity with the finals.

This confidence is very similar to Xu Yuan.

I remember that he was like this at the beginning, but after meeting Xu Yuan, he realized that his so-called mathematical talent was nothing at all, so he decisively chose to give up mathematics and switch to other majors.

"If you and Gen-ge become college roommates, I don't know whether I should congratulate you or sympathize with you."

After muttering this to himself, he quickened his pace to catch up.

……

the next day.

At eight o'clock in the morning, Xu Yuan was already sitting in the examination seat.

After getting the test paper, I took a quick look at it as usual, then calmed down and focused on the first question.

Compared with the final test questions, the national team training selection questions are more difficult.

But this is not a problem for Xu Yuan.

Especially in the state of deep learning.

"In acute angle △ABC, AD is the interior angle bisector of ∠A, point D is on side BC, ..."

……

"Prove that the triangle formed by the line segments BG, GE, and BF is a right triangle."

Finish reading the question.

Xu Yuan immediately extracted the important known conditions in his mind and generated the best solution to the problem.

And relying on one's own spatial imagination, one can draw a perpendicular line DG⊥BE directly through point D in one's mind, with the foot of the perpendicular being G.

Prove that the triangle formed by line segments BG, GE, and BF is a right triangle with BG as the hypotenuse.

Then prove that G is G.

As his ideas for solving the problem became clearer, Xu Yuan picked up his pen and started to answer the question.

It can be said that it was done in one go, without any hesitation or pause in the process.

The second question involved integer problems, which happened to be his forte.

It's easier to do.

That is to say, the finite set in the third question was a little more difficult, mainly because the proof process was a bit longer.

With the same number of questions and time as the final, Xu Yuan was able to finish the questions even faster, which shows that he has a deeper understanding of mathematics.

To be able to make it to the national training team, one's ability to withstand stress must be much higher than that of ordinary people, so Xu Yuan did not care about anything this time and simply chose to raise his hand and hand in the paper.

"Teacher, I want to hand in my paper."

The moment the words fell, the invigilator on the stage subconsciously looked at the clock hanging on the wall.

The expression on his face was immediately replaced by surprise.

Although all those who can take part in today's exam are math geniuses, the difficulty of the questions is also increasing. Those who can finish the test in such a short time are either stumped by the questions and choose to give up, or are geniuses among geniuses in mathematics.

But being able to participate in the national team selection, it is obviously impossible to be the former.

"Okay, classmate."

After being stunned for two seconds, the invigilator came to his senses and hurriedly walked down the stage to collect Xu Yuan's test paper.

This move naturally surprised the other candidates.

They had never heard of anyone who could finish the test so quickly in the training team selection exam.

The pressure inside the invisible center has increased a lot.

The rhythm that I had deliberately maintained was broken by the sudden tension.

Started to panic.

Among them, Liu Yang, who was in the same examination room, looked at Xu Yuan's back at the door with disbelief written all over his face.

He has been studying at Qinghua Affiliated Middle School since he was a child. It can be said that he has received the best educational resources. From elementary school to high school now, I don’t know how many mathematics competition awards he has won.

But he never expected that he would only be the runner-up in the National Middle School Mathematics Winter Camp Finals.

Got second place.

I became even more curious when I learned that the first place winner, Xu Yuan, was from a small county town.

He is not afraid of strong competitors because he is confident that he can catch up next time.

But before I could even exert any force, others had already pressed the acceleration button.

"You're actually faster than me!" Liu Yang lowered his eyes and looked at the test paper where he had just finished the third question. Then he consoled himself: "But being fast doesn't necessarily mean you get all the answers right. The most important thing in math is accuracy."

After saying that, he speeded up his hands again.

That is to say, Lin Haoming was not in this examination room, otherwise he would definitely have only four words to describe Xu Yuan's performance.

Just basic operations.

For Xu Yuan, this was no different from his usual practice of test questions, and soon the two-day exam was over.

October 3th, Thursday.

After Xu Yuan finished his lunch, he said something to Lin Haoming and set off for the nearby Qinghua University.

Since I have promised Tang Shihong to attend his open class, I definitely cannot go back on my word halfway. Coincidentally, the head coach of the training team also supported this when he learned about it.

As one of the most famous institutions of higher learning in China, Qinghua not only has a long cultural history but also a large campus.

Under normal circumstances, if an outsider comes in without a navigation map, it is possible for him to get lost.

However, Xu Yuan completed his graduate studies here in his previous life, so he was naturally very familiar with the school's situation.

After successfully entering the campus, we went to the famous science building, where Tang Shihong's open class would be held today.

(End of this chapter)