After finishing the meal, Lin Zhaosheng was a little exhausted. Zhou Yu said goodbye and left without disturbing him. Lin Chaoxi was a little embarrassed and hurriedly asked Pei Zhi to send Zhou Yu out, while Ji Jiang stayed.

I'm going to clean up the house and give Lin Chaoxi a helping hand.

It was already dark when they came out. When they walked out of Lin Zhaoxi's house and were about to get on the car, Zhou Yu suddenly stopped and looked at the silent Pei Zhi beside him.

"How many years have you lived in Germany?"

Pei Zhi nodded quickly: "Yes, yes."

"You speak Chinese German very well." Zhou Yu smiled and said, "You are a very strange person. You have lived in Germany for several years but you don't know authentic German. You haven't studied mathematics yet but you can solve the problem of graph isomorphism.

Do you know what it feels like to be an NP-complete problem?"

Pei Zhi was a little flustered: "What does it look like?"

"A liar, a person who has not gone abroad at all but deceived someone who has studied abroad. A plagiarist who didn't know where he found a formula written on Teacher Lin's draft. But your mathematical attainments are very high, Lin Zhaoxi told me

There are a lot of things about you, and you are also very good at programming, all of which Lin Chaoxi has seen with her own eyes."

Zhou Yu did not stop his speculation, but just smiled and said: "I can also see that you like Lin Zhaoxi very much, and you have not thought of hurting her but have been helping her. Your situation has given me a very good feeling.

Incredible speculation.”

Pei Zhi was panicked: "I have actually always studied mathematics, but because my mother didn't let me, I could only learn it secretly. I actually like mathematics very much."

"Haha." Zhou Yu suddenly laughed and looked at Pei Zhi deeply: "You are panicking."

Pei Zhi shook his head stiffly: "No."

Zhou Yu said to himself: "So you are a time traveler, and you are not Pei Zhi? That's not right. If you are not Pei Zhi, then why are you so familiar with Lin Chaoxi, and the emotion in your eyes is also very deep?

Could it be Pei Zhi from another world?"

Zhou Yu's eyes lit up as he spoke: "Tell me what happened. Are you afraid that Lin Chaoxi will find out? Why? It's normal to be afraid of others finding out, but I don't understand a little bit. The Lin Chaoxi you like is us

Lin Chaoxi from this world, right? Why? A person from another world fell in love with a person from this world? Unbelievable, double penetration?"

Pei Zhidou was stunned, his eyes suddenly revealed a light of disbelief, and he looked stupidly at Zhou Yu in front of him.

"Sure enough, I can confirm it from your expression." Zhou Yu laughed very interestingly and said: "I just lied to you, but now I can confirm that you are Pei Zhi from another world?

Another world has solved the P/NP problem? If you don’t want to tell me, then I’ll go talk to Lin Chaoxi?”

"Wait a minute, Professor Zhou!" Pei Zhi said in a panic: "Wait a minute, Professor Zhou. I can tell you whatever you want to know, but can you help me hide it?"

"Small question." Zhou Yu nodded with a smile and said, "Tell me what's going on. I think your current situation is very interesting."

Pei Zhi was a little surprised: "Professor Zhou, can you answer a few questions for me first?"

"Can."

Pei Zhidao: "Professor Zhou, how did you find out that I have a problem and that I would think of time travel."

"How should I put it?" Zhou Yu thought for a moment and said slowly: "I have very strong observation skills. Your performance is not quite right. Although you have always remained calm, Teacher Lin said that you were unconscious when you changed a lot.

He showed a little worry and panic. As soon as I heard your Chinese German, I knew that you came out of a training class and had not yet graduated, because my German is also very good."

"I can see that you have a secret hidden in your heart, a secret that cannot be discovered by Lin Chaoxi. In addition, the formula you wrote on Teacher Lin's draft is a bit superfluous. A Pei Zhi is completely different from what others have described.

I am not unfamiliar with the theory of parallel worlds, because you are not the only person who has traveled through this world."

Pei Zhi was a little stunned: "Professor Zhou?"

"No, I'm not a time traveler." Zhou Yu shook his head and said, "It's just that I have met a time traveler. It's a very fresh experience, right?"

Pei Zhi opened his mouth: "Are there other time travelers?"

Zhou Yudao: "I won't tell you the specific situation. In short, it was a very interesting experience, so it's not surprising that I have such thoughts. Originally, I was just more interested in Teacher Lin and you who wrote the formula.

I wanted to see if I could really solve the P/NP problem, so I made a special trip here. Unexpectedly, I discovered something more interesting, and now I want to ask you."

Pei Zhi nodded in a daze.

Zhou Yu said: "Has the P/NP problem in your world been completely solved?"

Pei Zhi hesitated for a moment, nodded and then shook his head: "It's solved. Life in our world has been completely changed because of the solution of this problem."

"What about your time travel?"

Pei Zhidao: "It is related to this but not completely related. I took the initiative to lead it."

Zhou Yu: "Your purpose."

"I want to be by Lin Zhaoxi's side."

Zhou Yu asked: "There should be a Lin Chaoxi in your world, why is it the Lin Chaoxi of this world?"

Pei Zhi's mood suddenly became a little excited: "The person I like is her. Pei Zhi in this world cannot bring her happiness, and there is no way to cure Master's disease. I can, I know how to use P/

NP to develop a special medicine to treat the master."

Zhou Yu motioned to Pei Zhi and said as he walked: "Calm down and tell us your story and time travel."

Pei Zhi took a deep breath and followed Zhou Yu, with a look of reminiscence on his face and said slowly: "When I was a child, Lin Chaoxi of this world traveled to my world, which was the Cheese World, a world similar to this world but different.

Another world of difference.”

"The Lin Zhaoxi of this world traveled through time and became the Lin Zhaoxi who was a child in the cheese world. She probably traveled through the past with Ji Jiang just now. Then we started to have contact, and we learned and grew together..."

This chapter is not over yet, please click on the next page to continue reading! Pei Zhi said slowly, and Zhou Yu listened very carefully. A little boy who was not yet enlightened had his first love affair with a girl, and he knew it from a very young age.

After learning about Lin Zhaoxi's time travel, Lin Zhaoxi, who had set a goal since she was a child to protect this world, stayed by her side, made countless efforts for this, and finally came to this world.

Later, Lin Chaoxi and Pei Zhi in this world also traveled to the cheese world, but Pei Zhi in the cheese world at that time was possessed by Pei Zhi in the strawberry world where Zhou Yu lived, and regretfully missed the opportunity to reunite with Strawberry Lin Chaoxi.

"You are too persistent." Zhou Yu gently patted Pei Zhi on the shoulder and said, "Obviously Lin Chaoxi likes Pei Zhi from the strawberry world, not Pei Zhi from the cheese world. People who are too persistent are easily injured.

, but only persistent people will succeed in this world."

Pei Zhi looked at Zhou Yu with some surprise: "Professor Zhou, you...?"

Zhou Yu laughed: "I know what you want to ask. Now that you are occupying Strawberry Pei Zhi's body, it is equivalent to slowly killing a person. But what does this have to do with me? This is your problem, not mine.

of."

"Subjectively speaking, what I want is Pei Zhi from the Cheese World to be my student, not Pei Zhi from the Strawberry World. You were the one who wrote that formula on the draft, not him, and you should be kind to me because of circumstances and reasons.

You are the one who loves me, and I also like persistent people.”

"But I hear what you mean. When you two cross each other, your body's original consciousness is actually suppressed, but you are aware of everything that happens in the outside world, right?"

Pei Zhi nodded: "Yes, he has been resisting and trying to drive me out of this body."

"You want Lin Chaoxi, but what about the other Pei Zhi?" Zhou Yu looked directly into Pei Zhi's eyes with a deep look: "What does he want, whether it is Lin Chaoxi or a perfect home, in fact, you can communicate and discuss it.

, you stay in this world and use your knowledge to help Lin Zhaoxi cure Teacher Lin, and he can also go to your world to accept your life, so that you can be completely assured that you will not be enemies and live the lives you want."

Pei Zhi was silent for a moment and said: "I don't know what to do. I have also communicated with him but he was very resistant."

Zhou Yu shook his head: "If they all like Lin Chaoxi, it will be difficult. Let's kill him."

Pei Zhi looked shocked, but Zhou Yu laughed: "Just kidding, communication is of course the main thing, but Lin Zhaoxi has already doubted you. If you continue to fool around in front of her, you will be discovered sooner or later.

Clues, let's communicate well. From what you said, it can be seen that the demands between the two of you are different. Maybe we can reach an agreement. You have the ability to take care of Lin Zhaoxi in this world, and you have the ability to help Teacher Lin recover.

, this is not something he can do."

Zhou Yu looked at Pei Zhi: "Are you interested in being my research subject? In fact, I also know a lot about hypnosis."

Pei Zhi hesitated in silence for a while, then nodded slowly: "Okay."

The next day Zhou Yu gave Pei Zhi money and asked him to be sent to the Lin family as a token of his gratitude. No matter what the disease was, as long as he had money, he could live longer than others. Pei Zhi gave it in his own name.

It was impossible for Lin Zhaoxi and Lin Zhaosheng to refuse. The name was the one-year salary advanced to him by Zhou Yu.

Pei Zhi, on the other hand, left the city with Zhou Yu that day, without even seeing Lin Zhaoxi again.

After many years of separation, Pei Zhi has been studying with Zhou Yu. At the same time, he is also a research subject and a fellow explorer.

The P/NP problem has been solved in the cheese world. The two people who solved this problem are Lin Zhaosheng from the cheese world, and the second is cheese Pei Zhi who is following Zhou Yu.

Cheese Pei Zhi is also very clear about the whole process. After giving Zhou Yu a detailed explanation from inside to outside, Zhou Yu also has a sufficient understanding of the P/NP problem.

At the same time, he also published a paper on graph isomorphism as an NP-complete problem in the names of himself and Lin Zhaosheng and Pei Zhi. Once again, it received great response and sensation, but then it stopped there and did not continue.

Some time passed, and Pei Zhi waited outside a temporarily rented drug laboratory for a long time and finally saw Zhou Yu, fully armed, walking out of it.

Zhou Yu threw the medicine bottle in his hand to Pei Zhi: "That's it. Special medicine, take one tablet a day continuously."

"Thank you, teacher, thank you, teacher." Pei Zhi held the medicine bottle in his hand ecstatically and said gratefully to Zhou Yu: "Teacher, you are the most powerful person I have ever seen."

"Actually, you're not bad either." Zhou Yu took off his mask with a smile and reminded: "Remember what I said, if the NP problem can't continue, we must stop Teacher Lin from continuing. I don't know what your world is.

situation, but you have seen the terrible consequences of misuse of research results."

"We can guarantee that we will not abuse it, but we cannot guarantee that this result will be abused by others. Once abused, the entire world's network system and financial system can easily collapse, and even bring various terrible results. The disastrous consequences of public research

It will be development but destruction. The world is not ready for this. Even if it wants to be made public, it must be done slowly. In short, from today on, the two of us, including me, must firmly seal all this in our heads.

.”

Pei Zhi was a little frightened when he thought about the scene where Zhou Yu easily cracked countless password firewalls using programming using research results, and even broke into foreign military satellites and intervened in military networks without any effort at all. At that time, it could be said that as long as Zhou Yu typed in a few

A single character can cause the world's economy to collapse in an instant or even trigger a war.
To be continued...