The small punishment in Liu Xinxin's eyes is actually very difficult.

Every day, from the morning self-study station to the end of the eighth period, it is not enough to stand at the penalty station, you have to hold the pen and hold the book, and put the book on the wall to write and check.

For the next two weeks, Chen Tao spent the days of standing guard, copying class rules, and writing inspections.

Liu Xinxin never gave him a good face again, but she didn't mention the fine of 1,000 either.

Zhang Qiang was okay and came over to stab him twice.

"You stand up straight for me! I don't stand up, I don't sit!"

"Look at your handwriting, like a dog!"

"How did you graduate from elementary school? Hmm? Don't you even have junior high school in your village?"

Chen Tao ignored him at all, and scolded him in his heart.

The happiest is Prince Ang.

Prince Ang was angry when he came to see Chen Tao, but now he was suspended from class and punished, and his seat was empty, he sat on his table openly and chatted with Liu Xuer and Zhao Qi, and the angry Li Xiang scolded people in the bedroom.

However, Li Xiang only dared to scold in the bedroom.

The Xu Meng that Wang Ziang is looking for is quite fierce, and several conflicts in the computer department are related to him, either he provoked it, or someone found him, and he settled the matter, this kind of character Li Xiang can't afford to provoke.

Time passed in the dull, and finally came to the day of the "Olympiad Class Trials".

I just got off my first class in the afternoon.

The classroom door opened, Liu Yu'er was the first to come out, the little girl was a little nervous, a little uneasy, and hurriedly ran to the stairs, Wang Ziang followed out, glanced at Chen Tao with disdain, and whistled away.

Chen Tao is in no mood to deal with him now, today is a big day he has been plotting for a long time!

When they packed up their pens and were about to leave, Liu Xinxin and Zhang Qiang appeared from the corridor.

Liu Xinxin had a calm face, "Where are you going?

It's been a month, and Chen Tao's 10,000-word inspection hasn't passed.

"Teacher Liu, I have to participate in the selection of the Olympiad competition, I signed up in advance!"

"Don't go!" Liu Xinxin rolled her eyes, "Just you, can you be admitted to the Olympiad class?" ”

"I can't say for sure, what if. Besides, if I can't pass the exam, I'm not allowed to study?"

"Don't be hippie and smiling!" Zhang Qiang glared, "I didn't pass the college entrance examination, you still have the Olympiad! Stand honestly for me, and don't go anywhere if you don't finish the inspection!"

"I signed up in advance for Osaiban! Why don't you let me go?" Chen Tao was also a little anxious, he had been planning for more than a month and was waiting for today.

"Just because I'm your homeroom teacher! I'm your counselor! You have to have opinions to reflect with the school! I also told you Chen Tao, don't let me meet you in the small hall, I'll fire you right away when I meet!" As she spoke, Liu Xinxin glared at him fiercely, and the corners of her mouth moved as if to say, "Stinky and shameless!"

Chen Tao pursed his lips and said in his heart: "If you don't let me go, I have to go!" Yangshou is only five days, how can I earn majesty if I don't go?

The current Chen Tao, what class teacher, director, school rules, school discipline, all side.

Now there is one thing - Cao Anmin!

Just one purpose - majesty!

After planning for so long, I can definitely earn it, Kong Ergou earned more than 5,000 that time, how can I have more than Kong Ergou this time, right?

If you earn 10,000 yuan, you don't have to worry about it for more than three months!

But can you make that much?

Chen Tao was worried and excited!

Seeing Liu Xinxin walk away, he sneaked downstairs.

......

......

Classroom 2 of the Cultural Auditorium, commonly known as the "Little Auditorium", is a lecture hall that can accommodate more than 200 students.

At this time, more than 100 students were already seated, and most of them came for the gold-lettered signboard of "Cao Anmin", including freshmen, sophomores and juniors. In addition to the more than 100 students, President Xu Boda, Director Li of the Department of Computer Science, and teachers from the Department of Mathematics also came.

It can be seen that the school leaders attach great importance to it, although most of the math teachers complain in private that it is useless for them to come to listen to Cao Anmin's lectures.

The crimson flannel curtains block the autumn sun from the window, and the twenty sets of LED lights are all turned on, and the atmosphere seems a little dull and a little nervous.

The class bell rings.

Cao Anmin, who was in his fifties, walked up to the podium, his hair meticulously combed and dressed in a formal dark blue suit.

All the classmates focused their eyes on him like soldiers who had been practicing for a long time and were finally going to battle.

Some nervously clutched ballpoint pens,

Some with a bit of excitement and excitement.

Looking at these students, Cao Anmin smiled faintly, he took the microphone handed by the teaching assistant, and said, "There are a lot of classmates here...... Okay, I'll first introduce you to the scoring rules of this selection competition, no need to take notes, it's very simple. ”

"There are a total of 20 questions, 10 of which are filled in the blanks, excluding complex calculations. Adopt a preemptive answer system. We score according to the speed of the students and the solution ideas, so it is possible that your final answer is wrong, but it doesn't matter, I mainly examine your solution ideas, some of these questions have three or four solutions, as long as other students have not said it, as long as you come up with a solution, you can score. After each question, I will give a brief explanation of my thoughts. Therefore, even if you don't know a question, don't leave in a hurry, listen to the teacher's thinking, help inspire your mathematical thinking, improve the efficiency of doing problems, and be very helpful to your test. ”

He glanced at the audience, "Any questions?" ”

"The first question...... Well, there are a lot of people rushing to answer! Okay, the students in blue over there. Say your name before answering the question......"

These 20 questions were carefully prepared by Cao Anmin, of which the first five are the classic types of questions in the Olympiad, and the difficulty is ordinary, in order to screen the beginners of the Olympiad exam. In other words, if you don't even have ideas for these five questions, don't learn Olympiad. Of course, these five questions can also be seen at a higher level, because each question has three or four ideas, some ideas can get the answer in one minute, while some take three minutes, or even longer, the more ideas you master, the higher the efficiency of doing questions, and it is easier to get a high score in the exam.

A question,

Two questions,

Three questions.

"The level is very good, much better than I thought. Cao Anmin is satisfied, for so many years he has been hoping to cultivate a mathematical genius, the kind of genius who can win international awards, but unfortunately the best result is the provincial first prize, which is still not a small distance from the international medal.

"There is no effort on the road to the temple of mathematics. ”

"Genius is nothing more than 99 percent sweat plus 1 percent inspiration. But that 100 percent inspiration is more important than 99 percent sweat. ”

Cao Anmin recalled his mentor's words, feeling a little sad and expectant.

Instead of focusing on which student he was watching, the 10 church assistants present took note of the respondents' performance.

As soon as the five questions passed, the speed of rushing to answer them began to slow down. The last ten questions, aimed at the basic Olympiad students, the difficulty is on the general side, the more difficult the later the questions, to the fifteenth question, seven or eight students raised their hands, which far exceeded Cao Anmin's expectations, ten years ago, he was really willing to accept these seven or eight students.

The last five questions are difficult and are used to identify the gap between the top students.

However, these seven or eight classmates still raised their hands in a competitive manner.

"The catkins are very stable.

The one named Wang Ziang also has ideas, has a wide range of ideas, and seems to have learned deeply.

And Buhe,

ZHANG Yan,

Everyone's score is very tight!

Looks like there's an additional question. ”

The twentieth question is over, and the superior has not yet been distinguished.

The teaching assistant cast an inquiring look at Cao Anmin, Cao Anmin scratched his head, and said with a smile, "I didn't expect everyone's level to be so high, what about the following question...... It's not a question prepared in advance, it's a question I made myself, well, it's difficult! Whoever can solve it, whether you answer the first 20 questions or not, you are eligible to enter my class. ”

The classmates talked a lot, and when it came to the stage of the school bully fighting, most of them had been eliminated, but it did not hinder their enthusiasm.

"I'm going to go to class, how difficult is this question?"

"Didn't you listen to the teacher? International Olympiad level! Let's not think about it, look at those top students. ”

"I've seen enough, that's the International Olympiad, is it something that ordinary people can answer?"

Liu Wu'er quickly took out a new piece of white paper, Wang Ziang sat up straight, and the remaining few top students also felt like they were going to participate in the 100-meter sprint, and they were eager to try.

This question will determine which of them will win and is the most crucial and important question!

Cao Anmin clicked twice on the computer, the projection screen flashed, and the additional questions appeared.

"Given any positive real number e, it is proved that all positive integers v except for a finite number of positive integers, any graph with v vertices and edges greater than or equal to (1+e)v contain at least two different simple circuits of equal length. ”

The students were obviously stunned for a moment, and the audience was silent.

Liu Wu'er's two good-looking eyebrows were tightly wrinkled, and she tilted her head in contemplation.

Wang Ziang glanced at it, and then lowered his head.

The female student named Zhang Yan moved her lips slightly, as if she was reasoning about her thoughts......

Everyone was silent!

seems to have expected this scene for a long time, Cao Anmin followed the temptation,

"If you don't have a clear idea, it's okay to come up with a general direction, let's brainstorm, don't be afraid of mistakes, and say your ideas. ”

Still silent.

This is the title of the international competition, you know every word, but you don't know what you are talking about.

Another two minutes passed.

Cao Anmin said with some regret, "Then the teachers present, give some tips to the students?"

In this way, he wanted to make it easier.

Teachers, look at me, I look at you, and no one speaks!

Teachers of Olympiad math questions usually do not come into contact, and no one dares to show ugliness in front of the school leader.

Director Li, who was sitting next to the principal, said with a smile, "Lao Cao, your additional question is too difficult. I can't see if I can't apply for your class, I won't be able to learn!"

"Hahaha. ”

Principal Xu Boda smiled, the teachers shook their heads with laughter, and the students muttered quietly.

"Is this question so difficult? Why can't the teacher?"

"Teachers are not omnipotent, and our math teachers are not as good as the students. ”

"I can't even read it anyway......"

Everyone thinks this question is too difficult!

Except for Cao Anmin, who wrote the question, no one answered at all.

Wang Ziang couldn't help but raise his voice, "Teacher Cao, let's change the question." ”

"Hehe, it still seems too difficult. Okay, then I'll change the question. Cao Anmin scratched his head, it seems that his question is still too difficult, and he still overestimates the level of the students. He was about to click the mouse, when suddenly, a somewhat lazy voice in the last row of the classroom spoke.

"This question...... I will!"

With a bang, all the leaders, all the teachers, and all the students turned their heads to look at the voice!

A boy in his freshman uniform with two thick eyebrows stood up, a thief's grin on his face.

"It's you?!"