Different from the serious atmosphere in other countries, the atmosphere here of the Chinese team seems to be much more relaxed.

"Zhengxuan, this way!"

Bi Qi waved to Ma Zhengxuan who had just walked out of the examination room.

"I knew you wouldn't hand in the paper until the last second." Bi Qi patted Ma Zhengxuan's shoulder and said with a smile, "If you want me to see, it is most comfortable to hand in the paper in advance. There is a saying...

…”

"It feels good to hand in the paper for a while, and it feels good to keep handing in the paper!"

Ma Zhengxuan smiled and glanced at Bi Qi lightly, "Forget it, I'm not like you. I always like to show off."

"How can you call it pretentious when it comes to scholars!" After being pointed out by Ma Zhengxuan, Bi Qi was a little embarrassed, "By the way, how long did it take you to come up with the idea for the third question?"

Ma Zhengxuan thought for a moment and answered, "About five minutes. Don't you just use the Menelauss theorem and affine commutative group that Teacher Gu once taught us!"

"Who says it's not the case!" Bi Qi slapped her thigh suddenly, "But it took me more than ten minutes to think about it. I'm really ashamed!"

"It's okay. Although it's a little slow, it doesn't hurt."

"But... I really can't forgive myself!!" Bi Qi looked up to the sky and sighed.

A street fighter who was passing by: "???"

…………

Gu Lu did not ask everyone about their performance in today's exam. Instead, he took them to dinner and arranged for them to return to the hotel for news.

And he himself took advantage of the quiet night to come to Imperial College of Technology.

By scanning his face, Gu Lu successfully borrowed a library card again and came to the library.

It was still the book "An Introduction to the Theory of Numbers". Gu Lu randomly found an empty space, flipping through the book, and revising the content of his paper.

He was busy until late at night, and when Gu Lu was about to return the books and leave, he found that there were several female college students with different looks sitting next to him, completely surrounding him.

"Handsome guy, do you have time tonight?" A girl with an explosive figure approached Gu Lu, her long wavy golden hair rubbed against Gu Lu's face, and said in a very seductive tone, "I heard that a hotel nearby has launched

It’s a couple’s room, do you want to experience it with me?”

"Sorry, no money." Gu Lu took advantage of his long legs and trotted away in a hurry.

"I'll pay, I can pay!!" The top girl shouted at Gu Lu's back.

…………

Gu Lu, who has lived abroad for many years, has long been accustomed to this.

After returning to the hotel and having a good sleep, he got up at around seven o'clock the next morning. After having breakfast downstairs, Gu Lu came to the office building again to participate in today's topic selection meeting.

Compared to yesterday, today's topic selection meeting seemed much more tense.

After all, yesterday, many team members from powerful competition countries were fooled by the third geometry question.

Those competitive countries will never allow this to happen again.

As soon as the meeting started, there was a strong smell of gunpowder.

Today's twenty questions also include combinatorial mathematics questions of similar difficulty to yesterday's geometry question.

The leaders of more than a dozen countries, led by the United States, South Korea, and the United Kingdom, proposed to Chairman Andre to remove this issue, but some people in this group of small countries still insisted on keeping the issue.

Due to the numerical advantage, this topic was not eliminated in the first round of screening.

But in the second round of voting for topic selection, that topic was eventually rejected.

Finally, after discussion, today’s three questions are:

The fourth question is plane geometry, the fifth question is algebra, and the sixth question is combinatorial mathematics.

The difficulty of the three questions is normal, medium and difficult.

Seeing that these three topics were selected, many team leaders from major countries breathed a sigh of relief at the same time.

These three questions are their team members’ favorite question formats!

The next step is to provide solutions to the questions and formulate scoring rules.

At this stage, many coaches looked at Gu Lu with worried eyes.

"Leader Gu, do you have any simple new solutions to the three questions this time?" Team Leader Yingguo walked up to Gu Lu and asked tentatively.

What is his greatest fear?

It was Gu Lu who suddenly came up with a new solution to a simple version of a question, and then someone proposed to change the question. If this proposal was approved and the combinatorial mathematics question was replaced, then they, the big competition countries, would really be in tears.

Yes!

That's why they were so worried that Gu Lu would stand up and add variables to the already selected test questions.

However, what made everyone feel a little relieved was that Gu Lu shook his head and denied with a smile, "No more this time."

"Is there really no more?" Team leader Ying Guo wanted to confirm again.

"There really aren't any more!"

Gu Lu smiled bitterly.

Everyone looked at me with the eyes of anti-thief, am I so unreliable?

Provide answers, develop scoring criteria, and translate test questions.

When several test papers translated into various languages ​​were placed in front of everyone, several team leaders from major competing countries put down a big stone hanging in their hearts.

Pu Changqu was also in a good mood. He smiled and said to Gu Lu, "Leader Gu, I take back what I said yesterday. Our bet still counts!"

Gu Lu: "???"

He turned to look at Pu Changqu speechlessly, "When did you tell me to give up the bet?"

Pu Changqu: "That's what I told you yesterday, but you happened to be away at that time, so you might not have heard it."

Gu Lu: "..."

Okay, as long as you're happy.

…………

Afternoon, lounge.

The leaders of the top-ranked countries in the competition, such as the United States, Yingguo, and Russia, leaned back in their chairs in a comfortable mood.

Pour red wine into the wine glass and stare at the picture displayed on the monitor while chatting.

At one o'clock, the IMO exam officially started the next day.

After yesterday's experience, Bi Qi didn't feel nervous at all at this moment, but was full of excitement and expectation.

The first question is geometry.

Oh, this is simple. First, let’s look at the converse theorem of Ptolemy’s theorem, and then come up with Desargues’ theorem.

What, not enough?

Here’s another double meaning of the Alcos Theorem. (Alcos Theorem 1 and Alcos Theorem 2)

After three moves in a row, no matter whether the question is a weak girl or a muscular man, Bi Qi can fuck them until they are foaming at the mouth.

The second question is algebra question.

It’s still Fermat’s Little Theorem!

No matter how many layers of armor it wears, Bi Qi can still see the essence of this question at a glance.

Bi Qi has done countless questions on Fermat's Little Theorem. Although the question in front of him requires a deformed formula of Fermat's Little Theorem, it is still somewhat new.

It seems that because I used Rejoice to wash my hair in the morning, Bi Qi's hair was silky and smooth without any hindrance.

An hour and a half after the exam started, Bi Qi only had the sixth question left.

[Given an integer N≥2, N (N1) football players with different heights stand in a row. The team coach hopes to remove N (N-1) people from these players, so that the remaining 2N in this row

Players meet the following N conditions:

(1) There is no other player between the two tallest players among them

(2) There are no other players between the third and fourth tallest players among them.

…………

(N) There is no other player between the two shortest players among them.

Proof: This can always be done.]

…………
Chapter completed!