Chapter 283 Hua Da: Is this a rejection or a promise?
The defense competition system is actually very simple. The contestants stand on the podium with their computers connected to a projector. They give their ideas for a difficult problem within a given time and try to complete it as quickly as possible.

To be fair, each person only has fifteen minutes. Those who have finished the defense will leave the examination room through another door, leave the teaching building and wait for the announcement of the list of participants in the international competition at the closing ceremony in the afternoon.

Maybe the organizing committee will just go by ranking to save trouble?

It doesn’t matter, whether the first or the last, Li Yan has no pressure at all.

"Let's get started, Li Yan. There is a question on the table. Please tell us your thinking process." Dude showed a rare kind expression on his stern face. "Don't be too strict. Tell us more so that we can see your thinking process."

"Even if they are just some tentative ideas." The executive director was wearing a formal suit today, and his temperament was very different from last night.

"Okay." Li Yan said and clicked on the question.

It's complicated at first glance, and it's still complicated at second glance.

Without the clever little characters who like to write poetry or play games, this question is very abstract and no nonsense.

It's like a math problem.

After watching for ten seconds, Li Yan spoke:

"The question should be: given a set of N non-leaf nodes and M leaf node values, the leaf nodes have initial values ​​0 or 1, and if a non-leaf node has x... now perform Q operations, each time flipping the initial values ​​of the leaf nodes numbered in the interval [l, r] (0 becomes 1, 1 becomes 0), and then ask how many ways there are to set parameters for the non-leaf nodes so that the root node value is 1, and take the value of the number required by the question."

Several judges in the audience smiled and nodded.

"This value is interesting." Li Yan also laughed.

Then he immediately frowned and began to think.

Three minutes later, he still hadn't said a word.

Dude gave the executive director a look, and the director was about to remind Li Yan that she could share her ideas.

Suddenly I heard Li Yan say "Hey".

"This problem seems impossible to solve because the number interval has nothing to do with the shape of the tree. We can't use any data on the tree to deconstruct and solve this problem."

The judges nodded again.

"And I guess the judges won't give me an unsolvable problem to test whether I can see that there is no solution... That would be a bit boring. This also means that this problem has a solution."

Do I seem to be talking nonsense?
"I made a bold guess. For this problem to have a solution, it would be best if each non-leaf node contributes independently to the answer. The proof here is not difficult, so I will skip it."

The judges were stunned, and the executive director picked up the microphone again.

"The main reason is that we don't have enough time, so I won't do some simple proofs." Li Yan quickly pressed down the director's hand holding the microphone, "After confirming this, the follow-up is not difficult. Please wait."

Then he opened the programming software on his computer desktop.

"Huh?" Dude opened his eyes wide.

Li Yan actually started to write code by hand at a speed that was jaw-dropping.

His hand speed was even so fast that his mouth couldn't keep up - it was indeed difficult to read, and he had to convert it in his mind, so he simply shut up and concentrated on coding.

The executive picked up the microphone for the third time to emphasize the time issue, but was stopped by Dude.

A genius performance, don’t be a spoiler, you need to be willful.

"I won't say anything else at the same time. I still have some time after I finish coding."

After about eight minutes, Li Yan stopped.

"As above, omitting the conjecture proof, the total answer can be maintained using a segment tree after the tree DP. Time is limited, so no optimization details are given, but it is probably feasible, and the time complexity is also indicated."

The judges looked at it for a long time. Some of those who were frowning relaxed their brows, and some who were in deep thought began to nod their heads.

Then their eyes randomly crossed each other and finally converged on Dude.

Dude took the lead in applauding, and the others followed politely to maintain the status of the judges.

"Excellent." Chairman Du said loudly, "I can't believe that you are a freshman. Judging from your performance in this year's national competition, I dare say that among all the talented young people I have seen in my many years as chairman, no one can match you!"

Now that the tone has been set, the applause becomes enthusiastic.

The nine geniuses who were just separated by a wall felt very complicated when they heard the applause.

Li Yan, who had just left the examination room, turned a corner and saw two men with name tags, dressed in suits and looking a little anxious.

They were anxious to see Li Yan.

So Li Dayingjia, who was just thinking about walking around the school after finishing his defense, was suddenly invited by this man and woman to the coffee shop next to the cafeteria.

In 09, a high school actually had a coffee shop!
But actually it is just a beverage area next to the cafeteria, which is mainly a study room, and also has some small stalls selling fruit juice, coffee and the like.

This is now called the "Contract Negotiation Room".

What they talked about was naturally the early signing of contracts between the talented high school students and the admission to prestigious universities.

There is only one possible identity for these two people who could have allowed Li Yan to follow them all the way:
The signing officer of Hua Xia University is actually a teacher in the admissions office.

As soon as he entered the room, Li Yan noticed two young men in blue suits beating their chests and stamping their feet.

On the table is "Huaxia University of Science and Technology". It is the second-ranked university in the country and its strength in science and engineering is not inferior to that of Huaxia University.

Hesitation will lead to failure, brothers. It must be unpleasant to be intercepted.

Just this room full of suits and brand names...it gives me the feeling of a real estate sales conference no matter how I look at it.

"Hello, Li Yan. I am Director Ma from the Admissions Office of Hua Xia University. We have all seen your wonderful performance in this competition..."

An expected wave of flattery.

It was their first meeting, so Li Yan decided to be polite and did not interrupt.

"To be honest, several of our colleges and universities held an internal meeting for you." Director Ma was a thin woman who looked to be about 40 years old. She had a pleasant voice and a gentle tone. "The main topic of discussion was your status as a freshman."

"It's almost the second year of junior high school." Li Yan replied.

Director Ma smiled and said, "Yes, based on your performance, you are fully qualified for special recruitment. No, it should be said that your performance is enough for all our major universities to recruit you with the utmost sincerity."

"But I'm in the first grade of junior high school." Li Yan added.

"Yes, Huada has never specially recruited a junior high school student." Director Ma lowered his voice, "We are considering implementing the Outstanding Talent Program, but the most radical plan is to expand the enrollment scope to high school students."

At this point, Director Ma looked impressed and said, "But you are in the first grade."

"Are you worried about the injury to Zhongyong, Director Ma?" Li Yan asked.

"Of course not," Director Ma laughed. "You can rest assured about this. Huada has never been so worried. Even our President Cai praised your genius. But to be honest, talent training cannot be rushed. You have just finished the first grade of junior high school. We will also take your experience into consideration... Huada will give you two options."

Finally getting to the point.

"The first is to continue to study in the second grade of New Taipei No. 3 High School next year, and then go to Huada High School for one year of high school to adapt to the new environment, and then choose a major to study in Huada's 2+3+ undergraduate, master and doctoral talent training program."

Li Yan had no expression on her face.

Director Ma didn't expect this reaction, and suddenly he was a little nervous. "The second one is more radical. He will go directly to the High School Affiliated to Huada University to study in high school next year. After two years of study, he will participate in the 'Outstanding Youth' selection organized by Huada University and determine his major to study in the Outstanding Class for Special Talent Cultivation."

Li Yan still had no expression on her face.

"Li Yan, do you have any ideas?"

"That's it?"

The two teachers from the admissions office of Huazhong University of Science and Technology were struck by lightning, and their brains exploded.

Director Ma, who has a high emotional intelligence, forced a smile and responded, "Student Li Yan, please don't misunderstand. These two plans do not mean to continue to evaluate you. It's just that learning at different stages is different. Training talents requires patience and carefully exploring the professional direction you really want to develop - especially a rare all-rounder like you."

"Yes, I know, Director Ma, doesn't Huada have a junior class?"

Director Ma didn't expect Li Yan to be interested in this, so he explained, "That was a training program for outstanding junior high school students. The initial version is no longer meaningful. Due to your outstanding performance, the school leaders have continuously improved the specifications, and there is no final version of the program yet."

"Can it be customized?"

Director Ma was a little confused. "Go ahead."

"First, set up a teaching point in Xinbei Middle School. I want to stay in Xinbei to study. Second, for the junior class... forget it, it's up to you to decide whether others give it to you or not. I only want to express my demands. Give me enough freedom to study and learning resources."

"If you want to set up a branch, then yes. There are different tendencies in centralized teaching and branch teaching." Director Ma frowned. "As for learning resources, we will definitely provide better teachers than the top high schools. But if you choose to stay in New Taipei, you can only look at the hardware facilities of New Taipei Middle School."

"fine."

"Learning freedom...what does that mean?"

“Like I am now.”

Being able to be the director of the admissions office, Teacher Ma is naturally no ordinary person. She also knows Li Yan's situation in junior high school very well, so she understands what Li Yan is talking about -

A privilege called freedom.

"I can agree to it on my own behalf, but it all depends on the final plan of the Huada Junior Class..."

"I understand this. Let's wait for the specific arrangements for the junior class."

"But I don't quite understand. If you choose the junior class, you have to spend an extra year in middle school. Wouldn't it be better to enter Huazhong University earlier?"

"I have my own considerations, Mr. Ma." Li Yan said with a smile, "Then we have reached a consensus, thank you."

As he said this, he shook hands with two teachers from the admissions office of the University of Washington, then waved and left, without taking a single cloud with him.

Students from other universities saw Li Yan smiling and shaking hands, thinking that the matter was settled, and shook their heads.

His face is full of the expression "Who says we are from BGI?"

The young man next to Director Ma looked at the signed agreement on the table, pointed to the blank signature column and asked:

"Director...does this count as a rejection or an acceptance?"

Director Ma frowned and thought for a long time, tapping his fingers on the table and said slowly:

"This kid is so interesting."

(End of this chapter)