I control the AI ​​empire thanks to the geniuses in my group.

When the two arrived at their front door, they found the old security door half-open, and they could hear low voices coming from inside.

"Take these two hundred yuan."

Dad's rough voice sounded tired: "Go to the market tomorrow morning and buy some good meat, and also buy a chicken to stew. Both kids are growing, especially Su Zhou, who just skipped a grade to start high school. He's mentally exhausted, so we must make sure he gets enough nutrition. Oh, and order two more cases of pure milk for the kids too."

My mom sighed and said with heartache, "Your birthday is next week. I was planning to save this money to buy you a new jacket; the cuffs of yours are all worn out..."

"Just forget about it," Dad interrupted nonchalantly. "I'm just a day laborer out here. Who am I dressing up for? I'll get all dirty from working. The most important thing right now is not to neglect my two kids."

Outside the door, Su Zhou paused, feeling a sudden tug at his heartstrings.

He took a deep breath and pushed the door open.

"Dad, Mom, we're back."

"Hey, hurry up and wash your hands so we can eat." Mom quickly put the money in her pocket and turned around with a smile.

Su Xing rushed into the bedroom like a cannonball to put down her schoolbag.

Su Zhou walked to the dining table, reached into his school uniform pocket, and pulled out three bright red hundred-yuan bills. He placed them neatly on the table and pushed them toward his mother.

"Mom, take this to help with household expenses, and also use this money to pick out a new coat for Dad."

Dad paused, his hand holding the cigarette still, while Mom stared wide-eyed at the three hundred yuan on the table, then looked at Su Zhou in disbelief.

"Su Zhou...where did you get so much money?"

Su Zhou pulled out a chair and sat down, her tone relaxed and natural: "Don't be nervous, I earned it by selling study notes."

"Selling notes?" Dad was stunned. "What kind of notes are worth three hundred yuan?"

"High school math Olympiad notes. I helped my classmate summarize the optimal solutions to several challenging problems, which are more effective than the tutoring classes he attends outside that cost hundreds of yuan per hour. This is knowledge payment that he willingly paid for," Su Zhou added with a smile. "It's all legal and compliant."

The couple looked at each other in bewilderment.

They knew their son was smart, as evidenced by his ability to skip grades, but the idea that he could make money simply by writing down some notes was completely beyond the comprehension of this working-class couple.

The father had no doubts and immediately said happily, "Good...good! My son has made something of himself and can earn a living with his own abilities. But keep this money; you'll need it for school."

"I kept a little over a hundred yuan for myself, that's enough for me. You can take it, I can earn more money in the future!"

Mom didn't say anything, but her eyes reddened. Dad saw this and quickly said, "Hey, what are you doing? You should be happy that your son is so amazing..."

Seeing this scene that was both heartbreaking and heartwarming, Su Zhou clenched his fists secretly.

This money-making venture was just a trial run; he needed to earn even more.

But here's the problem: how do we find someone like Zhao Zixuan in schools?

By the way, Coach Zhang Hengyuan said he would have him participate in on-campus training, so he can definitely start from there!

After getting a clue, Su Zhou planned to start organizing his notes tonight, but this time he would not write them in a notebook, but instead use an electronic document to organize them.

Handwriting is too slow and cannot be copied, but if it is organized into an electronic document, it only costs a few dollars to print at a copy shop, which can meet the purchasing needs of multiple people.

The hundred-odd yuan in his pocket was just enough as start-up capital.

Thinking of this, Su Zhou seemed to already smell the aroma of Mao Zedong's red banknotes, and for a moment, he became full of energy.

After quickly finishing his meal, Su Zhou went to his room to organize his notes.

the other side.

In the advanced math class in the east of the city.

The teacher quickly wrote a combinatorial problem on the blackboard, then turned around and said, "The standard solution to this problem is using generating functions. Has anyone thought of any other approaches?"

The classroom was deathly silent.

I'm completely lost when it comes to generating functions, what other ideas do I have?

The other hammers.

Zhao Zixuan, who was originally huddled in the back row, suddenly jolted when he heard the words "other ideas".

This question... has almost the exact same structure as the one Su Zhou talked about this afternoon.

The draft paper that Su Zhou had drawn instantly appeared in his mind: odd part decomposition, distinct part decomposition, bijective, binary decomposition...

He hesitated for two seconds, and then, for some reason, he raised his hand as if possessed.

The teacher was taken aback: "Zhao Zixuan? You say it."

The whole class turned around at once.

Everyone knows what kind of level Zhao Zixuan is usually at. It's already a favor if he can hand in all his homework. Today, the sun must have risen in the west.

Zhao Zixuan stood up with a stiff upper lip and stumbled over the double-shot structure that Su Zhou had explained that afternoon. Although he got stuck twice in the middle, the core idea was correct.

After the lecture, the classroom was so quiet you could hear the air conditioning blowing.

"...Zhao Zixuan, did you come up with this idea on your own?"

"Ah...uh..."

"This is incredible!"

The teacher slammed his hand on the podium, his voice rising: "Bijective construction! This is a technique that's only seriously taught in graduate-level combinatorics! You actually managed to see the structural correspondence directly from this problem? Your progress is incredible!"

"Did you all see that? As long as you attend the training courses diligently, you'll see progress!"

All eyes in the class immediately focused on Zhao Zixuan's face.

Envy, jealousy, existential doubt—it's all there.

Zhao Zixuan blushed.

Did you say it was your own idea?

My conscience wouldn't allow it; what if the teacher pressed me for details and I was caught red-handed? That would be such a terrible experience.

Saying it wasn't your own idea? With so many people watching, where do you put your face?

After a mental struggle, he gritted his teeth and said, "Teacher...actually, it wasn't what I wanted."

"Um?"

"It was a classmate of mine, Su Zhou. He told me about it this afternoon."

The teacher was stunned: "Which advanced class is he in?"

"Uh... he didn't attend the advanced class."

teacher:?

The whole class: ? ?

"He didn't attend any advanced classes and figured out the double-radial structure on his own?" The teacher was a little embarrassed and could only mutter, "I guess his family hired a tutor for him. Okay, you can sit down now."

As soon as the bell rang and the teacher left, Zhao Zixuan was surrounded by a group of classmates.

"Zixuan, Zixuan, did Su Zhou from your class really explain the problems to you?"

"Yes, he's a very smart person. I saw his notes today, so I asked him to explain them to me," Zhao Zixuan said honestly.

"Does he still have his notes? Can I borrow them to take a look?"

"Wow, this student is amazing! I want to see his notes too!"

With everyone talking at once, Zhao Zixuan's head was spinning from all the questions.

Recalling Su Zhou's nonchalant face that afternoon, and the nonchalance with which he said he "didn't have money for class," Zhao Zixuan suddenly felt a pang of unease.

If we show it to these people for free, wouldn't that be disrespectful to Su Zhou?

He was quick to speak and almost agreed, but in the end he swallowed his words.

"Regarding the notes," Zhao Zixuan cleared his throat, adopting a mysterious expression, "I have to go back and ask him directly. I can't just lend someone else's things on my own."

"Then let us know after you've asked!"

"Absolutely."

……

The next morning, as soon as Su Zhou entered the teaching building, Zhao Zixuan sprang out from around the corner like a spring and grabbed him by the neck.

They very casually gave Su Zhou a new nickname: "Pork Knuckle!"

Su Zhou was almost suffocated by his grip: "What are you doing? What's wrong with you so early in the morning?"

"I've brought you some business!"

Zhao Zixuan, beaming with excitement, recounted everything that happened in the math Olympiad class last night in detail, from his inexplicable raising of his hand to the teacher's shock, which nearly caused his glasses to fall off, to the grand scene of a group of people surrounding him after class, wanting to see his notes.

"Let me tell you," Zhao Zixuan said, getting more and more excited, "those people immediately asked you if you still had your notes and if you could borrow them, but I stopped them all. I didn't dare to make the decision for you."

"Brother, you really don't know what kind of people those are," Zhao Zixuan said in a low voice. "A math Olympiad class that costs 600 yuan an hour, which family that can afford it isn't rich? They're probably even fatter than me. If you put your notebook in front of them, aren't you just handing meat to the wolf's mouth?"

"They pounce on it as soon as they smell it."

Su Zhou was taken aback.

To be honest, when he was working on organizing his electronic notes at home last night, he was thinking that the earliest he could reach the next batch of clients was during on-campus training. He didn't expect Zhao Zixuan to give him such a surprise.

It's like someone offering you a pillow when you're sleepy.

"However," Zhao Zixuan changed the subject, frowning, "there's something difficult to handle. These notes of yours are handwritten. How long will it take to copy them one by one? People might not be willing to wait in line."

Su Zhou walked slowly towards the classroom with her schoolbag on her back, without even turning her head: "You don't need to worry about that."

"what?"

"I already organized the electronic version on my computer last night, and I also added some new things. The content is more complete than the one you read. I've even come up with a name for it: 'Zhou-style Secret Manual'."

"We'll go to a print shop to print and bind them. It'll only cost a few dollars per copy, and there'll be plenty to go around."

Zhao Zixuan stood there stunned, then slapped his thigh hard: "Damn it, what's your brain made of, Elbow?!"

Su Zhou chuckled at his words, slung her backpack over one shoulder, and continued walking forward, saying, "Zhao Zixuan."

"Um?"

"You can't help with this for nothing." Su Zhou's expression turned serious. "Here's the deal: the notebook will be sold for 551 copies. For every copy sold, you'll get a 50-cent commission."

Zhao Zixuan froze on the spot.

He quickly calculated that at least ten people had surrounded him after class yesterday. Even if he only closed half the deal, each order would still be worth fifty yuan, which would be several hundred yuan in cash, flowing straight into his pocket.

The first time in my life I've earned money on my own was by selling... my classmate's study notes?

No, his father taught him that he should look at things from a long-term perspective and not just focus on immediate gains.

Zhao Zixuan swallowed hard and waved his hand, "No need, no need, fifty is too much. I'm just lending my name to help you promote it, how can I charge that much?"

"Then how much will you say?"

"Twenty, twenty-one books is enough." Zhao Zixuan held up two fingers, looking particularly generous. "I'm not mainly after the money, it's just a buddy relationship, I'm helping out."

Su Zhou raised an eyebrow, thinking to himself that this person wasn't greedy, and said, "Okay, I'll listen to you."

Just as Zhao Zixuan was about to pat his chest in agreement, his eyes darted around, and he suddenly leaned closer, grinning, "But, regarding the pork knuckle, I have a small request."

"explain."

"Didn't you say you added new content to your notes? Could you give me that new content for free? We're such good friends."

Su Zhou waved his hand and said, "Sure, the updated notes will be free for you."

Zhao Zixuan's eyes lit up instantly, completely disregarding the fact that the other person was younger than him, and said, "Oh, thank you, Brother Elbow!"

The more he thought about it, the more he felt his luck today was off the charts. Seizing the opportunity, he took another half step forward, lowered his voice, and said with a fawning expression, "Well, given our relationship, the notes are free, so the tutoring... well, maybe that could also be..."

Su Zhou paused in his steps.

He turned around, looked Zhao Zixuan up and down expressionlessly, and asked with a confused expression, "Who are you?"

Zhao Zixuan: ? ? ?

"Elbow, stop doing that!"

"How come I don't remember knowing such a greedy person?"

"Braised Pork Knuckle Bro! Okay, okay, okay!"

Zhao Zixuan immediately gave in, surrendering with a bitter expression of being exploited by capitalists: "I was wrong, I shouldn't have been so arrogant. Tutoring... tutoring at the standard rate for an Olympiad math class, six hundred yuan an hour, is that alright?"

"Six hundred?"

One second Su Zhou was pretending not to know him, the next he put his arm around Zhao Zixuan's shoulder, his tone becoming so friendly it was like he was a completely different person: "Zixuan, which area do you want to brush up on? Combinatorics or number theory? Don't worry, I'll arrange it for you, a VIP seat, we can start anytime!"

P.S. Please give me your monthly votes and recommendations! I'm currently on a recommendation list, so I can't update too much. This book has a complete outline, and I'll make up for it by writing 10,000 words a day after it's officially released. Please don't let the book sit unread!