The second day was a break, and the third day was the opening ceremony. These two days are actually a rest. The opening ceremony is actually just a matter of sitting down and listening.

"Hey, which team do you think is more likely to win the championship this year?" Some are the media, some are people from all walks of life. Some are from other teams.

"I think there is still a lot of hope for the American imperialist team. Because this year's U.S. Olympiad national team is still coached by Carnegie Mellon University mathematics professor Rob Shen. Last year, he was also the head coach who allowed the American imperialist team to win last year's championship. In addition, under his leadership, the US imperialist team won two consecutive International Mathematics Olympiads in 2015 and 2016. If we win the championship again this year, it will be another second consecutive championship. ”

"Well, this year's U.S. imperialist team is still strong!"

"I think the Goose Ross should be strong this year as well. I heard that they had two perfect scores in this year's National Mathematics Olympiad. ”

"It's hard to say that their country's Olympiad has perfect scorers. Now it's the World Mathematics Olympiad! It's not the same difficulty, okay. ”

"I think the Chinese team may win the championship!"

"Team Huaxia? Although the Chinese team belongs to the world's strongest teams. However, the performance in the past few years has gone downhill. It's possible to win the top three, and I think you're thinking too much about winning the championship!"

"Yes, the Chinese team has been going downhill in recent years. ”

"No matter what, in the Olympiad competition, Asians are still the smartest! Last year's U.S. imperialist team was four with two, and four of them were of Asian descent. ”

"Haha~ Don't you say I almost forgot. It's really ironic!"

"By the way, in this way, the baseball national team may become a dark horse this year. It's time for them to break out after they've been immersed in it for so long. ”

……

Soon it was the fourth day, and this day was the beginning of the first day of exams!

More than 600 candidates were assigned to different examination rooms.

Of course, Xiao Jun was not in the same examination room as the other five people on his team. Everyone is assigned to a different exam room.

Entering the examination room in advance, Xiao Jun unexpectedly found out. Unexpectedly, it was found that there were players from the American imperialist team, the stick national team, the German team, and the goose Rose team.

These are the best teams in the world!

"Hehe, it seems that the examination room I am in is really full of strong teams!" Xiao Jun found his own seat, sat down, and then observed the candidates of each team around him.

He noticed that some of the candidates looked a little nervous, while others were more calm.

Especially those candidates from the world's top teams, their performance is relatively relaxed. It seems that these people are more confident in their own strength and more relaxed!

Soon it was time for the exam, and the invigilator began to hand out the test papers.

After the test papers are distributed, the exam bell begins!

"The exam has officially begun!"

As soon as Xiao Jun got the test paper, he first read all three questions.

1: K is greater than L and M is greater than N is a positive integer and KM+LN=(K+L-M+N)(-K+L+M+N). Verify that KL+MN is a composite number.

"Why is the topic of this first day so difficult?" Xiao Jun frowned slightly.

Generally speaking, the questions on the first day of the International Mathematics Olympiad are often easier than those on the second day. And the first question on the first day is generally to test the basic Olympiad knowledge. Most people should be able to take it down.

But judging from the first question above, the difficulty seems to have risen a lot!

Xiao Jun searched through all the mathematical knowledge stored in his mind.

"Hey, I found a similar question type!"

"But...... It seems that I have not yet understood the true meaning of this kind of question, and I cannot fully integrate it......"

"I can give a little answer to this question, but it's not perfect. Definitely get a lower score. I can't get a perfect score of 7 for this question!"

"Forget it, let's throw it to the top students in the group. In the end, Xiao Jun can only rely on the two top students in the group, and he wants to get full marks!

……

On the podium, the main invigilator looked at the test paper in his hand and frowned slightly: "The question of the first question this year is so difficult, much more difficult than in previous years." It looks like tomorrow's exam questions will be even more difficult. Maybe no one will get a perfect score this year. ”

He knew very well that last year, there was only one perfect score for hundreds of candidates. That is, the championship produced one against the American imperialist team. This year's one is even more difficult than last year's, so it's even more difficult to produce a perfect scorer.

At this moment, the dozens of candidates in the inspection were all frowning.

Because the difficulty of the questions on the first day was unexpected.

Even the candidates of the American imperialist team, the stick national team, the goose ross team and other strong teams have solemn faces.

An hour later, Sheldon in the [Xueba Chat Group] was Ait Xiaojun.

Sheldon: @肖俊~ Group leader, we have worked together to write out the answers to these three questions, you can take a look!

Xiao Jun: Hehe~ Thank you both.

Xiao Jun, who got the answer, wrote the answer on the test paper after reading it once.

"Huh~ It's finally done!" Xiao Jun put down his pen and looked at his test paper full of answers, feeling happy in his heart.

Xiao Jun, who finished writing the test paper, began to get bored, and secretly glanced around when he was fine. Since the desks are far apart from each other, there is no such thing as plagiarism.

Especially when he saw that the two candidates of the American imperialist team and the stick national team were frowning, he was very complacent.

"Well, is that Huaxia team done?" Jack of the American Imperial Team saw Xiao Jun's relaxed face and looked at him with a smile. Let his heart tighten!

"It can't be that fast, can it?"

But when he thought about it for a while, he saw people sitting there with a relaxed face. And it seems that the test papers are densely filled with answers. Although the answer is not clear. But it's obviously all three questions written!

Suddenly, cold sweat broke out on Jack's forehead!

"Fack, he's done all three questions in just an hour, and I've just finished the first one!" Jack was shocked. If that's the case, wouldn't tomorrow's exams have an advantage over you?

"If the other party is really so strong, won't it affect the final team total standings?" The more he thought about it, the more he felt a cold sweat. He had heard his mentor say that he was most afraid of encountering this kind of demon!

Before I knew it, another ten minutes had passed. The candidates in the examination room are all working hard. Xiao Jun is the only one, no, there are a small number of people who can't do the questions and are busy in a daze.

Xiao Jun, who was bored in every way, was thinking, should he be skinny?

Participating in such a large-scale competition, I don't feel sorry for myself?