Especially the member of the E national team behind Su Qingyun, he clearly saw Su Qingyun's series of actions, first directly completed the last question, and then turned to the front, and directly completed all the questions within an hour.

He almost doubted life.

The member of country E looked at the last question on his test paper, he had been thinking for a full twenty minutes, and he still didn't have any ideas.

He remembered that the person in front of him had only spent about ten minutes doing this question, and he really doubted that they were really doing the same question. What kind of monster is this guy up there?

The minute hand of the clock has turned almost three times, the exam is nearing the end, and there are very few people who have completed the test paper, and the vast majority of people are looking at the last question, after thinking for a long time, they are still at a loss, without any ideas, and they can't write at all.

After finishing the previous questions, the contestants who finally breathed a sigh of relief turned pale, and their hearts that had just been put down a little bit were lifted again, they didn't expect that the difficulty of the last question would be so high, and it was simply qualitatively different from the previous questions, and it could not be compared at all.

What to do? What to do? Many people frowned, their mood was anxious, and the atmosphere in the examination room was so tense that it was about to freeze, except for ...... Su Qingyun, who was still sleeping, her leisurely pace was completely out of place with others in this examination room.

After thinking about it for a long time, someone finally began to write with difficulty, but the writing was also intermittent, which was obviously not easy, and more people still had a blank question at the end.

Seeing that the exam time was about to end, many people gritted their teeth and wrote some ideas on their heads, thinking that they could get a little bit of a score.

The bell for the end of the "Bell Bell Bell ......" exam finally rang, and many of the contestants reacted with relief.

This feeling of seeing that time is coming to an end and nothing can be done is simply a kind of torture, and the exam time is over, but it is a relief for them.

The difficulty of the last question was beyond many people's imagination, and everyone walked out of the exam room with a look of frustration on their faces.

Su Qingyun slept quite comfortably this night, and even yawned when he straightened up, which attracted many people to look at him angrily.

Su Qingyun walked out of the examination room, Li Siyuan was in the examination room next to her, Li Siyuan's face was a little pale, when he saw Su Qingyun, his eyes lit up a little and he immediately walked over, and he opened his mouth to speak.

"You want to ask the last question, right?" Su Qingyun said directly.

"Yes." Li Siyuan's face was not very good-looking, he thought about the last question for a long time before writing, and finally wrote it hard, and he was not sure whether he did it correctly or not.

When he saw Su Qingyun's relaxed face as he walked out of the examination room, he knew that she must have solved this question.

"What exactly should I do with the last question?" Li Siyuan licked his dry lips, his throat tightened, and his heart was drumming.

Su Qingyun thought for a while, "Two key points. ”

"What is it?" Li Siyuan asked impatiently.

"First, Vedic theorem, and second, infinitely decreasing." Su Qingyun stretched out two fingers, "The addition of these two is the Veda jump." ”

"Veda jumps." Li Siyuan muttered a thoughtful repetition of the term.

"Yes." Su Qingyun nodded, they are not stupid to come to participate in this competition, and the prompt point is enough.

The standard Vedic jump is usually performed in three steps: 1, assuming that the equation has a solution and letting x be the smallest solution; 2, with the help of Vedica's theorem, a smaller solution y,3 is introduced from x, thus contradicting the minimath of x, so that the equation has no solution.

The last question of this paper can be solved with the Veda jump, which will later become a very famous method in the Olympiad solution.

Li Siyuan had already fallen into self-reflection and blocked the others, Su Qingyun didn't continue to say anything, she stood outside, and saw Chen Ru and Mu Qiu also come out, their faces were all ugly.

"How?" Su Qingyun asked them.

Chen Ru grimaced, "It's not good." ”

"The last question, I didn't make it." Mu Qiu's tone was low.

"It's okay ahead, right?" Although he had confidence in everyone, Su Qingyun still asked.

"Not bad, no problem." Both nodded,

"It's fine." Su Qingyun comforted them, "We didn't make it, and the others didn't make it either, and it's all the same." ”

This is indeed Chen Ru and Mu Qiu nodded, their expressions were not very good-looking when they looked at the players from other countries.

"Shall we?" Chen Ru asked Su Qingyun, a little incredulous, "Qingyun, didn't you make it too?" ”

“…… It's done. Su Qingyun touched his nose.

"......" Chen Ru sighed faintly, and he said that if Qingyun hadn't made it, he really didn't know how many people would be able to do it in this competition.

However, fortunately, Qingyun made it, and they felt a little better, at least there were still people in their team who made it.

As he was talking, Chen Zheyu also came over, his face was the same.

He looked at a few people a little tiredly, "How is it?" ”

"On the last question, we are all wiped out." Chen Ru pointed at himself and Mu Qiu, "However, Qingyun has made it." ”

Chen Zheyu nodded, there was not much surprise on his expression, it was similar to what he thought, to be honest, the difficulty of the last question was beyond imagination, he had heard many contestants complain just now, and he was a little surprised that Qingyun could do it.

Thinking of this, Chen Zheyu smiled bitterly, their team still had to rely on the youngest Qingyun to raise the average score in the end.

"Let's go downstairs first, the team leader is still waiting below."

"Okay."

The five of them walked out of the examination room, and the anxious Yu Qi was waiting for everyone, and when he saw a few people, he hurriedly greeted him, and couldn't wait to ask: "I just heard from a member of the team from other countries that the last question is very difficult, how are you doing?" ”

When he was waiting below, he had already heard the discussion of other national players, and he was a little panicked.

Chen Zheyu is the oldest, and he told the truth.

Yu Qi was stunned and stood on the spot, what is the problem? It stumped so many people.

"Qingyun made it?" He quickly got to the point.

"Hmm." Su Qingyun nodded.

Yu Qi's heart was a little relieved, and he could keep one of them, "What is the topic?" Tell me about it. ”

"Set the integer a, b satisfies ab+1 and can be divisible by a2+b2......" Su Qingyun recited this question word for word.

Yu Qi quickly took out a pen and paper and recorded the question, he looked at the question with his eyebrows twisted, and looked at it for five minutes, but he still didn't have any clue.