Plane Geometry, Elementary Number Theory, Algebra, Combinatorics.

Of these four areas, combinatorial math problems are the type that Bizzie is not good at.

Bi Qi has long known this, so since entering the winter camp, he has deliberately increased the practice of combining mathematics problems.

The IMO finale in front of us is obviously a combinatorial permutation problem in combinatorics mathematics.

Bizzie first tried to use the principle of repulsion.

Then it turned out that it was not feasible because there was only a difference between the heights of the players, and there was no intersection.

Then try the knowledge of combinatorial arrangement.

By listing all possible player height permutations, defining the value of the binomial, and finding a kicking scheme that meets the criteria of the problem.

But after a few minutes, Bizzie simply gave up on this idea.

For no reason, it's just too complicated.

It's so complicated that in the next three hours, all of them are on this problem, and he may not be able to finish it.

"There must be an easier solution, let me think, let me think. ”

............

In the lounge, Park Changqu smiled at Gu Lu beside him,

"Team Leader Gu, that student of yours seems to be in trouble!"

In today's exam, Bi Qi's speed in the first two questions is still unbeatable.

Today's three questions are not as perverted as yesterday's questions in terms of difficulty.

Just when everyone was worried about whether Bi Qi would continue to lead and hand in the paper for the first time again, no one expected that Bi Qi would be stuck in the sixth question, which was not very difficult.

And one card, it is more than ten minutes.

At this time, Jin Antai, who was sitting next to Bi Qi, had gradually caught up with Bi Qi's progress.

Of course, Kim An-tae is completely unaware of all this.

He completely followed Park Changqu's teachings, this time, even if he was beaten to death, died outside, and jumped from here, he would not look at Bi Qi!

Yesterday, he was too concerned about the progress of Biqi's side, which caused his mentality to explode.

Kim An-tae won't make the same mistake twice.

............

"I'm finally going to conquer you!"

Bi Qi, who had been stuck on the third question for nearly twenty minutes, couldn't help but yell in his heart.

Under Bi Qi's cocoon, the layers of clothes covered by this math problem were still stripped off by Bi Qi one by one, and they were completely naked in front of Bi Qi.

Bizzie's obsessive gaze examined the delicate body of the subject, moving his fingers and preparing to begin his journey of conquest.

The tip of the pen touches the paper, making a rustling sound.

"First of all, the consecutive N+1 players will be divided into groups from left to right, for a total of N groups. ”

"Mark all the players according to their height from tall to short, until the first time two marked players appear in the same group, stop the marking, leave the two team members, and remove all the other players in the same group and other marked team members, which is regarded as an operation. ”

"After the operation, the number of groups changed from N to N-1, and as many as one player was removed from each of the remaining N-1 groups, that is, at least N players remained, and the remaining players were all lower than the height of the players left. ”

"Operate N times in the above way, and finally leave N pairs of players, there are no other players between them, and the height of the player who was left first is higher than the player who was left later, so these 2N players meet the requirements. ”

That's it, perfect!

The thrill of conquest is intense.

There was almost no pause in the middle, and all his thoughts were vented.

After watching the time, plus the foreplay and the main play, it took Bi Qi a total of nearly an hour.

"It's really a tough guy to keep me going for so long, but it's really exciting. ”

Bi Qi wiped a wipe of sweat from his forehead, and for some reason, he felt the urge to smoke.

After checking it from beginning to end, Bi Qi didn't hesitate to get up and raise his hand.

"I want to turn in the papers!"

It was still an hour and a half early to hand in the papers.

Many candidates in the venue looked up in surprise, and after seeing that the first person to hand in the paper was still the same person yesterday, they still bowed their heads to do the questions with a flat expression.

Bi Qi smashed his mouth, with a helpless expression.

Sure enough, if the same scene is repeated twice, the effect will be greatly reduced.

It seems that we will have to learn to innovate in the future.

Otherwise, if you keep eating your old book, how can you become a forced ...... Ahem, how to become Teacher Gu's man!

Jin Antai was sitting next to Bi Qi, and it was impossible not to hear the movement of Bi Qi handing over the papers.

"You can't see it, you can't watch it. I didn't hear it, I didn't hear anything. "Kim An-tae made a trick to 'deceive himself', and resisted the desire to turn his head to Biqi's side.

In front of the monitoring screen, Park Changqu silently gave a thumbs up to Kim An-tae.

He didn't believe it, Jin Antai didn't look at Bi Qi's side, he couldn't, that Huaguo player could still affect Jin Antai's mentality.

However, the next moment, the scene that Park Changqu saw made him dumbfounded.

"Knock knock~~"

Holding back the desire to look at Bi Qi, Jin Antai, who was about to calm down and continue answering the question, suddenly saw a hand tapping on his desktop.

Looking up, there was Bi Qi's bright smiling face.

Bi Qi showed a smile to Kim Antai who thought he was quite friendly, and like yesterday, he made a cheering gesture, "Come on, come on!"

Kim An-tae: "......"

Bi Qi, who adheres to the principle of friendship first and competition second, after expressing his goodwill to foreign friends, he didn't care what Jin Antai's reaction was, and left directly.

Jin Antai was directly stunned on the spot.

Mockery!

What a blatant mockery!

Nameless fire, anger almost made Kim An-tae almost lose his mind.

He looked down at the half-finished sixth question on the test paper and found that his mind was in a mess.

............

In the lounge, Bi Qi ran up quickly, walked directly to Gu Lu, and said to Gu Lu as if inviting merit, "Teacher, my performance this time is okay." ”

"I saw that the Korean player seemed to be answering the question, and I didn't notice my side, so I went up to him and knocked on his desk a few times before he received my encouragement. ”

Pu Changqu turned his head numbly, staring at Bi Qi with murderous eyes.

"It's okay, but sometimes, you don't have to force it. Gu Lu commented on Bi Qi's operation today.

Bi Qi nodded in a teachable manner, glanced at the monitoring screen on the wall of the lounge casually, and said in a puzzled tone, "Hey, why is the Korean classmate sitting next to me even more manic now than yesterday!"

Park Changqu turned over the dead fish's eyes.

Why is Kim An-tae's state worse than yesterday, don't you have a B number in your heart?

Are you the devil?!

Obviously, Jin Antai has turned his ears to what is going on outside the window, and he is only working on the question, but you are so crazy that you can run to Jin Antai to mock.

And it's a double taunt that has intensified!

Kim An-tae wouldn't be able to you on the spot, so it's good.

"Eh, Team Leader Park, what are you doing?" Gu Lu asked when he saw Park Changqu get up.

"I'm tired, go out and smoke a cigarette slowly. Otherwise, I'm afraid I won't be able to make it back to China. ”

Pu Changqu pushed the door open, leaving everyone with a bleak, lonely and desolate back.

............

PS: Handsome readers, vote for recommendations!