The protagonist’s halo

Probably it was too long in the second big question. By the time Xiao Han finished the test, forty minutes had passed.

Xiao Han saw the third big question again, which was a very difficult algebra question. To break through the core of the question directly was to ask the examinee to go in a bold and greedy direction to speculate the calculus. Divide the 4036 points of the rough condition in the question into 2018 line segments.

This greedy algorithm can quickly figure out the problem. Indecisive, too conservative, will stagnate on this issue.

Xiao Han was too lazy to waste time on this question, and directly used the physical model method. As long as the model can be built correctly and the solution method is appropriate, no matter how huge the amount of calculation is, it will not form an obstacle.

After winning several levels in a row, Xiao Han's eyes fell on the last question, which was very concise and beautiful.

It is not an exaggeration to say that it is a beautiful essay.

However, most candidates may not feel so happy after seeing the problem clearly, because this is a very unfriendly question. The last sentence of this question requires proof. If the quadrilateral in Newton's theorem is a double-heart quadrilateral, then this four-line The point of meeting is also on the inner and outer line.

In other words, the five lines of the double-centered quadrilateral, the two diagonal lines, the line connecting the two opposite tangent points, and the line connecting the two circle centers, intersect at the same point.

This question looks very complicated, confusing and unable to start.

But it's actually not that difficult. If you know the basic conclusions related to the matching pole, the proof is almost three lines long.

Xiao Han wrote a beautiful three-line character and ended his exam.

...

When Xiao Han handed in papers in advance, the invigilator was particularly impressed with her, so she would pay attention to her from time to time.

Originally, I walked by her and watched her stop on the second question, thinking that her progress was only slightly faster than others. This is understandable. The second test of the number is much more difficult than the first test. As the first additional test, The development of mathematics competitions in these years has gradually become the main force in the semi-finals. The math group has issued instructions this year to increase the difficulty of the competition for this year's IMO.

She occasionally looked at the questions and felt headaches, and most of the students on the field only barely completed the first question.

Just when the invigilator didn't pay much attention to the letter of Xiao who handed in the paper in advance.

As a result, the second test was less than one-third of the time, and she finished writing, at an incredible speed.

The invigilator was a little confused, and looking at the progress of other students and frowning in a bit of a pen, the questions were still so difficult.

I took another look at the paper that the student had handed in. It was full of writing, not giving up the blank paper. The formula steps are also very beautiful. The invigilator instantly understood that the student was probably at the level of the provincial team.

Every year in the quarter-finals of the Digital Federation, there are one or two talented scholars who even the teacher has self-doubt. The strength is even beyond the measurement range. This teacher who thinks that he is experienced is also used to it. The Buddha mentality is nothing impossible. , Otherwise she wouldn't just be an invigilator.

When Xiao Han came to the lounge to look for Teacher Xu, facing her early submission of papers, the other teachers were not as shocked as they were when they tried it. It is their ability for others to hand in papers in advance.

Teacher Xu nodded and asked her to sit down and rest, and wanted to ask her how she did on the exam. When he changed to another student, he still had to consider whether it would scare people, but Cheng Yin had been with him for a while, and he didn't see any pressure on her, so it was more casual to talk about exam questions.

Since there was still a lot of time to spare, Xiao Han took the time to pass the time and silently answered the question as before.

When Mr. Xu worked on his own calculations, he found that he was also stuck on one or two of the big questions.

"How did you do this?" Teacher Xu didn't feel embarrassed, and asked Xiao Han directly.

Xiao Han said a word, directly instructing Teacher Xu's thoughts, "It turns out that it is so." Teacher Xu nodded and suddenly realized.

Teacher Xu didn't have the awkwardness of relying on the guidance of the students to understand, even if there were others next to him, he worked so desperately to train for their competition, isn't it just to train talented students like Cheng Yin?

And the second big question that spent the most time on Xiao Han in the game really caught the attention of Teacher Xu.

"How did you come up with this solution."

This sentence was not asked by Teacher Xu, but by an older and energetic teacher who appeared next to him.

When Mr. Xu saw the old teacher, a hint of surprise flashed in his eyes, but he didn't expect this person to come to the examination room himself.

In fact, Teacher Xu also wanted to ask. He also thought about it when he saw the problem. He gave a way to solve the problem. But when Cheng Yin said it, some didn’t respond. He didn’t expect what she said. This solution seemed to be born out of thin air. Teacher Xu remembered that there was a poem in a Chinese subject that didn't have much to do with mathematics.

Cheng Yin's answer gave him this feeling.

In other words, I just don't know how long the brain of Cheng Yin is, so I came up with this way of solving the problem.

Xiao Han said in a very flat tone, "After coming up with five ways to solve the problem, the sixth way came out naturally, I just happened to notice it."

Teacher Xu was shocked and didn't show it on the face: "..." So there are four other methods?

Cheng Yin actually came up with six ways to solve a problem in the semi-finals.

Obviously, Cheng Yin has delved into this question to the extreme. If she knew that she would be like this, Mr. Xu would definitely warn her not to be overly indulged in delving into a big topic in the arena. Maybe she can't stop her interest, but Forgetting the exam time, missing a major opportunity, the consequences are undoubtedly serious, regrettable life is possible.

But even if Cheng Yin came up with all the solutions, it took her less than sixty minutes to complete the paper in advance. With such a talent for mathematics, how could Teacher Xu bear the heart to be harsh.

And more importantly,

"Okay, very good." The old teacher with white hair carried his hands behind his back, nodded, and left without saying anything. He just happened to pass by, seeing that there were candidates coming out so early, and hearing Cheng Yin and her teacher exchanging questions and answers, he couldn't help but come in and listen.

Even this student gave Cheng Yin's personal affirmation. Teacher Xu saw that this student was satisfied and could no longer be satisfied.

Xiao Han has noticed that even if Teacher Xu, including other teachers, did not directly address him, they all inadvertently showed respect for him.

After the old teacher left, other teachers in the lounge couldn't help but participate in the discussion of the exam questions, "This question is too difficult for the students, and the level of discussion is enough for IMO."

"In the competition questions, the difficulty is also surprising, and there is more than one set of propositions."

"Yes, how many students can do it."

The teacher choked as soon as he finished speaking, isn't there someone who made it in front of him? There is also the sixth solution to that question, which really makes people doubt how long Cheng Yin's mind is. Forget the unforgettable memory, the talent and intelligence in mathematics and physics are still so high, they are born to shock people.

He couldn't help thinking about the possibilities of the few top mathematics students he brought to solve these big problems. Forget it, don't hope too much.

At the end of the second test, as expected by other teachers, few contestants who came out of the examination room were still in good mood. Most of them looked bleak, dejected and gloomy.

Including several other students from Donghua High School, they were also very silent after they came out. Meng Mi's eyes were red, and she whispered, "The question is so difficult. Why can't I do it? I'm so bad."

Jiang Yunhao is still in a trance, "Why is it harder for the SFC semi-finals year after year? Why didn't I cherish the opportunity of freshman year?"

Participated in two consecutive sessions, but he didn't expect that the first year of high school was not prepared enough, and the second year of high school encountered a surprisingly difficult rematch. What else can he say.

The other few Gao Shengsheng gained a profound and painful insight, and had an earth-shaking new understanding of Dashu Jing.

Xu Jun's brows kept tightening, probably not able to complete all the questions.

But to their surprise, Teacher Xu, who had always been serious and straight-faced, had a strangely gentle expression and took the initiative to comfort them, "It's okay, it's your experience if you fail, so go back and rest."

Jiang Yunhao and the others were a little dazed, and nodded subconsciously flattered.

Xu Jun subconsciously looked at Cheng Yin who was talking to Meng Mi, and intuitively told him that Teacher Xu's attitude might be related to Cheng Yin.

In the car going back, after Xiao Han unlocked a few horns that Meng Mi couldn't get through, Meng Mi suddenly became clear, and his mood was not so low.

On the other side, on the bus of a top high school, more than a dozen candidates discussed the questions and answers with each other. Finally, a boy cheered and exclaimed, "I did the eight big questions correctly, and it’s not impossible to get the first place in the semifinals. ."

As a result, the team leader poured cold water on him, "First, you don't need to think about it anymore."

"But second, you are still possible." Another teacher said silently.

The student who was struggling to be confident: "..." Teacher, do you just encourage your students like this?

The two teachers looked sour and there was no way. Who made Cheng Yin of Donghua High School write out all the answers to the questions silently, and there was nothing wrong with a big question, that would not be a full score.

The first is not who else she can be.

...

A week later, the results of the second round of the United Kingdom came out.

At the flag-raising ceremony on Monday, the principal personally announced the news in public on the leading stage, with a very cheerful tone, "Congratulations to Cheng Yin of our school for winning the first prize with full scores in the national middle school student mathematics league. , Sit firmly in the first place in the provincial competition area, will be able to enter the provincial team to participate in the CMO, that is, the national finals, to participate in the national team player quota."

Thousands of students below were shocked and at a loss.

All full marks, the first place in the province's division, to participate in the national team competition, what is this concept.

Even other students who don't know much about the competition know that this result is enough to make them look up. At the end of last semester, Cheng Yin still won the first place in the city, and now he has reached the first place in the province, and he is still participating in the national finals.

The principal on the stage almost laughed out of it. The first in the province is in their high school. Can he be upset?

Moreover, it is said that until now, apart from Cheng Yin, no one has scored full marks. Not only in the province, but also in other provinces. Otherwise, it would have been announced long ago. That is to say, Cheng Yin is likely to be a national mathematics league. The only full score in the rematch.

Their school has never had such a good competition result.

This fairy score is enough for the principal to chat with colleagues from other schools for a year or a half.