15:30 Exam starts

Although Li Shaoyu is ostensibly the invigilator of this exam, his real identity is actually the admissions office teacher sent by Xiamen University to Jianghai Jieyun Middle School to recruit talents for this exam, but he himself is very complaining about the decision of the upper echelons

In his heart, only a century-old famous school with a profound heritage or an affiliated school with huge resources will have talents worthy of recruitment

As for Jianghai Jieyun Middle School, which has only 80 years of school history and an online rate of 91.3%, he is actually very disdainful in his eyes

"It looks like I can only catch a few cheating boys to play with today, alas! I'm a high-ranking laborer who has been sent here to catch cheat sheets, alas...."

Li Shaoyu looked at the students who were sitting under the lectern waiting for the test papers, and smiled slightly

After he found two students in the front row to check the sealed bag of the test paper, he handed out the test paper, and then sat on the invigilator table, picked up the thermos cup and began to taste the West Lake Longjing wolfberry tea brewed this morning, and looked at today's math test paper by the way

"Although the question this time is more difficult, as long as the basic skills are solid, there should be no problem in getting a passing score, but this last question.... Alas, there should be fewer children with high scores this time," Li Shaoyu secretly assessed in his heart

Ye Chen's feeling was similar to that of Li Shaoyu

The previous question is nothing more than the comprehensive use of sequences, derivatives, and functions, but the calculation process is a bit cumbersome

But the last big question, which has a full 35 points, is no less difficult than the sum of any test papers that Ye Chen has taken before

The title is also a bit weird:

"Three merchants each with an entourage to cross the river in a boat, a small boat can only accommodate two people, the retinue secretly pleaded, on either side of the river, once the number of retinues is greater than the merchant, they will kill people and goods, but the power of how to cross the river by boat is in the hands of the merchants, ask: How can the merchants cross the river safely?"

The questions are not difficult, but the requirements for solving them are a little awkward

(1) Verbal expression of the optimal solution

(2) Reasoning the optimal scheme with pure mathematical logical thinking"

Ye Chen wrote the first question without hesitation

"In the first round, two retinues went and one retinue came back."

"In the second round, two more followers will go over, and one will come back."

"In the third round, two merchants passed, and one retinue and one merchant returned"

In the fourth round, two merchants passed, and one retinue returned. ”

"In the fifth round, two retinues go and one retinue returns."

"In the sixth round, the last two followers passed and successfully crossed the river!"

But the second question made Ye Chen fall into deep thought

"It seems to involve mathematical modeling thinking problems, and this exam is really interesting"

Ye Chen thought to himself

But after about 5 minutes, Ye Chen had an idea and wrote down the answer in a fluttering manner

"1 recorded that the number of merchants on this bank before the k-th crossing of the river was xk, and the number of retinues was yk, k=1,2,......,xk,yk=0,1,2,3

The two-dimensional vector sk=(xk,yk) is defined as the state, and the set of states under the condition of safe river crossing is the set of allowed states, which is denoted as s.

s={(x,y)|x=0,y=0,1,2,3; x=3，y=0，1，2，3； x=y=1，2}

2. The number of merchants on the K-th ferry is UK, and the number of retinues is VK. Define the two-dimensional vector dk=(uk,vk) as a decision. The decision set is allowed to be recorded as d, which can be seen from the capacity of the boat: d={(u,v)|1≤u+v≤v,u,v=0,1,2}

3 Based on the above conclusions, the variation law of state SK with DK is as follows: S(K+1)=SK+(-1)KDK"

After completing the answers, Ye Chen spent another ten minutes checking the test papers

got up and stepped forward in the confused eyes of many candidates

"Do you want to go to the bathroom? Go for it! Li Shaoyu looked at Ye Chen and smiled

Ye Chen shook his head, put the test paper in his hand on the podium, and explained

"No, teacher, I'm here to hand in the test papers, can I leave the exam room early?"

"Hmm.... Don't check it out? Hey, forget it, put me here, go ahead."

Li Shaoyu said, but he was sarcastic in his heart

"Sure enough, it's a non-first-class high school, this is said to be the exam room for the top 15 students in the last school test, and someone gave up so quickly, it's really...."

Li Shaoyu was thinking about it, but as soon as he saw the standard answer format on Ye Chen's test paper, especially the answer to the last question, he couldn't help but put away the contempt in his heart and began to read it

"The first question is correct

Question 2 is correct

That's right....

The last question, this method, turned out to be much simpler than I thought, this...."

Li Shaoyu secretly hid the shock in his heart, and asked the deputy examiner next to him with some excitement

"What was that student's name? In which class? ”

The deputy examiner was also a little surprised by Li Shaoyu's reaction, because he could hear from Li Shaoyu's tone before that Li Shaoyu was very disdainful of Jianghai City Jieyun Middle School itself, including teachers and students, and he also had a lot of complaints as a teacher of Jianghai City Jieyun Middle School, but he was the chief examiner, and the official university crushed people to death, and he couldn't say anything

"Uh.... It seems to be Ye Chen from the ninth class of the third year of high school, but..."

The deputy examiner wanted to say something, but Li Shaoyu ignored him

"You proctor the exam for me, I'll make a call, I'll come right away"

After Li Shaoyu dropped a sentence, he took out his mobile phone and walked out of the classroom quickly

"Tick.... Tick...," the phone went through

"Xiao Li! What's wrong? Didn't you go to Jianghai City to recruit students? How to fight.... Could it be that the construction problem I came up with was made? ”

"Yes! Professor Zeng, it took a student less than an hour to make it, including other test questions, and it is estimated that it took him less than ten minutes to do this question...."

Zeng Xiaoming couldn't help but be surprised when he heard it

When he simply asked this question, he felt that it was not difficult, but just now he couldn't help but feel a little regretful after waiting for the information from the admissions offices of various high schools

Because this question is rarely made, even if it is made, the result is either wrong or too cumbersome, and the time is generally about 40 minutes

Originally, he had given up hope, but due to some specific factors, Jianghai City Jieyun Middle School was relatively late in the examination time, and the examination began only after the examination was basically completed in other places

Zeng Xiaoming heard that someone had done it so quickly, so he hurriedly urged Li Shaoyu to send Ye Chen's answer to him

Zeng Xiaoming stared at his phone for a long time, and then laughed

Several graduate students working on projects in his office were too frightened to raise their heads, but thought silently in their hearts

"Professor, is this because of his work, which has made him insane? No, I'll find a psychiatrist to take a look."

Zeng Xiaoming didn't care what his laughter would make others think

Looking at Ye Chen's answer, he muttered to himself

"The thinking is clear, although it is still a bit cumbersome, but for a high school student, this level is enough to enter the ranks of elite freshmen of Xia University!"

Then, he found Li Shaoyu's phone and dialed it

instructed: "This kid has good qualifications, you try your best to recruit him to Xia Dali, and when you select the title of associate professor next year, I will vote for you."

After hearing this, Li Shaoyu agreed with a thousand thanks

I thought that for the sake of the title, I also had to recruit Ye Chen to Xia University

After Ye Chen finished the exam, he found Luye Alley opposite the school gate and bought milk tea and sushi for Yu Yueying, and prepared to wait for her to replenish her energy after the exam

When he returned to the door of the examination room after buying his things, the bell rang at the end of the exam

Wei Yueying almost fell down when she walked out of the examination room because she used her brain too much on the last question, and she was born with a weak constitution and a little anemia, Ye Chen quickly stepped forward to help her, touched her slightly pale face with pity, handed her the food in her hand, and said thoughtfully

"Yingying, don't be so hard, I'll be distressed, hurry, I bought you some food, you pad your stomach first"

Wei Yueying looked at the food in Ye Chen's hand, her heart was extremely warm, she couldn't help but get close to Ye Chen, smelled the unique breath of a boy on Ye Chen's body, gently kissed Ye Chen on the cheek, and then grabbed the food bag in Ye Chen's hand, and ran out with her head down

Ye Chen touched the lip prints on his face that still had residual warmth, smirked from the bottom of his heart, and chased towards Yu Yueying

Not long after Ye Chen walked away, Li Shaoyu chased him out

"Huh? What about people? Forget it, go to their homeroom teacher."

Li Shaoyu couldn't find anyone, so he went straight to the office of the director of the third year of high school

Ye Chen took Wei Yueying's little hand, feeling the soft little hand gently rubbing against his palm, looking at the street in front of him, which was already extremely familiar, but he felt particularly beautiful

Just as Ye Chen was about to invite Yu Yueying to his house as a guest today, a piercing alarm suddenly sounded in Ye Chen's brain

Ye Chen was then forcibly teleported into the pure white system space

"Alert! Alert! A mechanical civilization signal has been detected

The signal level has been determined

Mechanical three-stage transgression-style cross-dimensional detection waves

Ask the host to take shelter in the system space in the near future

A system lockout procedure has been carried out

.... Locked"

After listening to the system's alarm, Ye Chen's heart instantly began to tremble

Sharply asked

"You.... Didn't you say 30 years? How did this invade now? Are you xxx kidding me! ”

"Please don't panic

The system has confirmed that the probability of this probe is to detect the identity of the host is 60%

Prepare the host for the next step."

Ye Chen's heart was galloping past with 10,000 grass horses, and he couldn't help asking

"Then you won't give me something to defend myself from? I'm just an earthling, and I'm afraid that a dog from other people's mechanical civilization alone can tear me apart 1,000 times."

"The host requirements have been confirmed, and feasibility is being analyzed

Analysis has been completed, approval requirements have been made"

Then, a platform slowly rose in front of Ye Chen, and on the snow-white platform were four pieces of black technology that he had only seen in movies

When Ye Chen's eyes lit up, the voice of the system sounded again

"The system is given the host's current danger level

Provides the host with a chance to draw an A-level draw (25% for samples, 25% for blueprints, 25% for experience, 20% for adult technology, and 5% for epic rewards)

Four A-Rank weapons to choose from for the host

1. Z-type Aji Armor: It can provide all-round protection for the user, through the miniature particle generator, it can detect lethal damage within 5 meters around the host, and defend against impact through the invisible particle shield

Limit: 5/5 of the number of uses

2. Ghost Energy Rifle: Rapidly expanding dark energy strike ray, quickly suppressing ground targets, with a maximum rate of fire of 300 rounds per minute, and an effective range: 1600 meters

(Comes with a 600-tube energy magazine)

3. Type A Ranger Unmanned Attack Aircraft: Quickly reduce the enemy's living targets, and use a 40,000 joules miniature energy cannon with a muzzle

Effective battery life: 4000 minutes

4. Train-mounted signal jammer: shield all particle floating signals within a range of 400 meters"

Ye Chen listened to the complex but detailed introduction of the system, and couldn't help but make a difficulty

"This decision will affect my life for a while, how can I choose?"

"One feels good, and two feels a little.... China is forbidden to guns, I take a gun out, I'm afraid that I will be killed by the armed police if I don't wait for the mechanical civilization to come, don't think about it three and four, not to mention the trouble of operation, I don't know what way the other party will use to deal with me, if it is a crowd tactic, I will kill myself"

After thinking about it, Ye Chen picked up the first piece of black technology