Especially the member of Team E behind Su Qingyun clearly saw Su Qingyun's series of actions. He first finished the last question directly, then flipped to the front and finished all the questions within an hour.
He almost doubted his life.
The E country member looked at the last empty question on his test paper. He had been thinking about it for twenty minutes and still had no idea.
He remembered that the person in front of him only took about ten minutes to finish this question. He really doubted that they were really doing the same question. What kind of monster is this person in front of me?
The minute hand of the clock has turned almost three times, and the exam is coming to an end. However, very few people have finished the test paper. The vast majority of people are looking at the last question. After thinking about it for a long time, they are still at a loss. They have no ideas and cannot solve it at all. Pen.
The participating team members, who had finally breathed a sigh of relief after finishing the previous questions, turned pale, and their hearts that had just been relieved were raised again. They did not expect that the difficulty of the last question would be so high. It was simply different from the previous questions. There is a qualitative difference and cannot be compared at all.
what to do? what to do? Many people frowned and felt anxious, and the atmosphere in the examination room was so tense that it was almost stagnant, except... Su Qingyun, who was still sleeping. Her leisurely style was completely incompatible with the others in this examination room.
After thinking for a long time, someone finally started to write with difficulty, but the writing was also intermittently. It was obviously not easy. For more people, the last question was still blank.
Seeing that the exam time is coming to an end, many people gritted their teeth and wrote down some ideas. All they thought about was how to get some points.
"Ring, ring, ring..." The bell finally rang at the end of the exam, and many of the participating team members breathed a sigh of relief.
This feeling of not being able to do anything as the time is coming to an end is simply a kind of torture. The exam time is over, but it is a kind of relief for them.
The last question was more difficult than many people imagined. When they walked out of the examination room, everyone had expressions of frustration on their faces.
Su Qingyun slept quite comfortably this time. When he straightened up, he even yawned, which attracted many people to stare 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 opened his mouth to speak.
"You want to ask the last question, right?" Su Qingyun said directly.
"Yes." Li Siyuan's expression was not very good. He thought about the last question for a long time before he wrote it. In the end, he forced himself to write it. After finishing it, he was not sure whether he did it correctly or not.
When he saw Su Qingyun's relaxed expression as she walked out of the examination room, he knew that she must have solved the problem.
"What should I do for the last question?" Li Siyuan licked his dry lips, his throat was tight, and his heart was pounding.
Su Qingyun thought for a while, "Two important points."
"What is it?" Li Siyuan asked impatiently.
"First, the Vedic theorem, and second, the infinite diminishing method." Su Qingyun stretched out two fingers, "The addition of the two is Vedic jump."
"Veda jump." Li Siyuan murmured and repeated the term thoughtfully.
"Yes." Su Qingyun nodded. They were not idiots to participate in this competition. They just gave up on the prompts.
The standard Vedic jump is usually divided into three steps: 1. Assume that the equation has a solution, and let x be the smallest solution; 2. Use Vedic theorem to deduce a smaller solution y from x, 3, so that it is consistent with x Minimality is contradictory, so the equation has no solution.
The last question in this test paper can be solved using Vedic jumping. Vedic jumping will later become a very famous method in solving Mathematical Olympiads.
Li Siyuan had already fallen into self-thinking and blocked other people. Su Qingyun did not continue to say anything. She stood outside and saw Chen Ru and Mu Qiu coming out again. Their faces were all ugly.
"How is it?" Su Qingyun asked them.
Chen Ru grimaced and said, "Not very good."
"I didn't finish the last question." Mu Qiu's tone was low.
"Is there any problem ahead?" Although he had confidence in everyone, Su Qingyun still asked.
"Not bad, no problem." Both of them nodded.
"It's okay." Su Qingyun comforted them, "We didn't make it, and neither did anyone else. It's pretty much the same."
This is indeed true. Chen Ru and Mu Qiu nodded. When they looked at the participating team members from other countries, their expressions were not very good either.
"We?" Chen Ru asked Su Qingyun, somewhat unbelievable, "Qingyun, haven't you done it yet?"
"...It's done." Su Qingyun touched her nose.
"..." Chen Ru sighed quietly, and he said that if Qingyun hadn't solved it, he really didn't know how many people could solve this question in this competition.
Fortunately, Qingyun did it, and they felt a little better. At least there was someone in their team who could do it.
While they were talking, Chen Zheyu also came over, with the same unfazed expression on his face.
He looked at a few people a little tiredly, "How are you doing?"
"On the last question, we were all wiped out." Chen Ru pointed at himself and Mu Qiu, "But Qingyun did it."
Chen Zheyu nodded, with no surprise on his face. It was pretty much what he expected. To be honest, the difficulty of the last question was beyond imagination. He had heard many team members complain just now, so he was a little surprised that Qingyun could do it. .
Thinking of this, Chen Zheyu laughed bitterly. In the end, their team had to rely on the youngest Qingyun to increase the average score.
"Go downstairs first, the team leader is still waiting below."
"good."
The five people walked out of the examination room. An anxious Yu Qi was waiting for everyone. When he saw a few people, he hurriedly greeted them and asked impatiently: "I just heard that the last question was very difficult from the team members from other countries. How did you do?"
While he was waiting below, he had already heard the discussions of other national team members, and he felt a little panicked.
Chen Zheyu was the oldest and he told the truth about the situation.
Yu Qi was shocked and stood blankly on the spot. What was the question? It stumped so many people.
"Did Qingyun make it?" He quickly grasped the key point.
"Yeah." Su Qingyun nodded.
Yu Qi felt a little relieved, as he could keep one word at a time, "What is the topic? Tell me about it."
"Suppose a positive integer a, b satisfies ab+1 and can be divided by a2+b2..." Su Qingyun recited this question word for word.
Yu Qi quickly took out a pen and paper and wrote down the question. He frowned and looked at the question for five minutes, but still had no clue.
