In the summer of 2008, a group of us math enthusiasts stayed on campus.

For the love in my heart, the 99 participating students of the school spent an incredibly hot summer together.

In the first half of July, we were in the lecture hall of Shaw Building, led by three senior professors from the Department of Mathematics, from 8 a.m. to 8 p.m., focusing on mathematical theoretical knowledge.

In the second half of the month, from 8 a.m. to 9 p.m., we were escorted by senior lecturers from the School of Computer Science to learn professional computer programming knowledge.

In the mathematical theory class, we learned all the most cutting-edge mathematical theory knowledge at that time.

After half a month of intensive study, I learned what is principal component analysis and multiple linear regression; We learned various fitting functions, learned random forests, and learned the GM(1,1) grayscale prediction model.

On the day of the end of the theory class, the competition training committee also hired a senior mathematics professor to give us a one-day lecture on "Fractal Geometry".

On that day, I was completely struck by the mysterious beauty of order, the beauty of great mathematics, which was hidden deep beneath mathematics!

It turns out that the most beautiful thing in the world has never been food, color, sex, these things in the world, nor is it the ethereal things of the soul and soul.

The most beautiful thing in the world, it is no exaggeration to say, is mathematics - .

Other disciplines are stepping on the shoulders of mathematics, and they are constantly embellishing and feeding mathematics.

At that time, I had a crazy obsession with math students.

Later, the position of our classes was transferred to the computer room.

The computer room of the school is free for the students to use until the end of the mathematical modeling competition, and each person is equipped with a computer.

There are 6 computer teachers who surround us throughout the day and teach us how to use computers to implement all kinds of amazing mathematical algorithms.

Through intensive and high-intensity training every day, I learned to use the Matlab toolbox proficiently, learned how to write code in computer languages such as C and Java, implemented the most powerful BP neural network algorithm at that time, and achieved the desired error convergence training...

I was full of joy and harvested, and I felt like a sponge had grown in the depths of my brain, absorbing and digesting it vigorously...

In just one month, I feel that my whole person is growing, as if some buttons have opened the eye of wisdom one after another, and the whole person suddenly opens up...

And Fu Huazheng, he will also appear from time to time, appearing in that hot summer, that beautiful campus.

He would send me more professional books from time to time, and would often print out sets of Chinese and English mathematics papers and send them to me.

Basically, every time, he will bring watermelons, grapes and other melons and fruits to cool off in summer...

At that time, the dormitory building also prepared several centralized bedrooms for us with a single door. Due to the hot weather, moving to the dormitory is not particularly troublesome: a bamboo mat, toiletries, and two changes of summer clothes are enough to spend the whole summer.

The school's logistics department opened several windows for us in the cafeteria, and when we caught up for meals, the TV set raised above the cafeteria would show us the outside world. It's just that our steps are too hurried, and only in the few minutes when we are chopping rice will we hurriedly look up and pay a few eyes. Even when we started broadcasting the opening of the Olympic Games and the fierce events of the Olympics, it didn't attract us too much.

Since mid-July, as soon as the theoretical knowledge class is over, the thunderstorm has been non-stop...

Every day, when it comes to meals, the participating students have to hold umbrellas before they can go to the cafeteria.

I also have an umbrella, which I bought at a "high price" from the girls who came to the school under the guise of work-study at the beginning of my freshman year. There are a total of three Paradise umbrellas, and the umbrella bones are all problematic.

I couldn't fix them, but I was able to make do with them. However, when the rain is so heavy that it can't last long.

I only dared to run to the cafeteria when the rain became lighter.

That year, there were 99 students from the whole school, including 21 from the School of Computer Science. However, they were all freshman and sophomore boys, and I was the only female student in the School of Computer Science at the time.

Since the tournament ended up in a three-player group stage, I also had two partners, but both of them were boys. Also, I could see that they were unusually excited, so I chose to go alone most of the time except for classes.

I would often wait in front of the Shaw Tower, observing the puddles of water in the distance, watching the raindrops falling from the sky on the water, and watching the ripples in the circles from large to small, before I dared to officially take a step.

At that time, I often wore a pair of sneakers: it was the pair of Li Ning that Hua Ming bought for me on the day of the April Sports Day.

I was afraid that water seeping into the soles of my shoes would ruin the life of my shoes, so when I went out, I would carefully take them off and wrap them in a plastic bag that I prepared.

I walked barefoot through puddles of water, and when I got to the classroom, I went to the toilet to wash and dry my feet and put them on again.

It was August 14, 2008.

After class that day, the rain was unusually heavy, the thunder resounded through the campus, and the sky was a little dark.

As soon as the comprehensive computer course ended at 9 p.m., the students began to go back to the dormitory one after another to wash off the sticky discomfort on their bodies and eliminate the unbearable heat.

That night, I was the last.

I finished working on the last line of code in front of the computer, satisfied, packed up my pen and notebook, and prepared to leave.

I helped turn off the computer screen and the main chassis that were still lit in the computer room.

Finally, I extinguished the lights in the classroom and carefully locked the classroom door.

After locking the door, I took off my sneakers and put them in a plastic bag, took out my cartilage umbrella, and prepared to go downstairs to the dormitory.

I had just walked to the stairs when the accident happened.

I was about to turn the corner down the stairs when I almost bumped into a figure head-on.

There was a tall figure, draped in a dark raincoat, standing at the corner of the stairs, in front of my eyes, under the lamp in the hallway!

My heart contracted, and I quickly stopped and held on to the railing next to the stairs.

When I stabilized my body and looked up at that face, I suddenly fell into an ice cave!

The guy across from me, he looked at me with such a weird smile.

He looked at me and lifted his right arm, which looked like a vitiligo scar.

In a strange tone, he smiled evilly at me:

"Liu Zijun, tonight, finally let me guard you! Hehehe, you won't forget about me so quickly, will you? ”

I felt a pang in my heart, looking at his ill-intentioned smile, holding back the pain of my heart contraction, and boldly said loudly: "Zhang Zijun, this is the campus, this is the campus, I forgive you for not daring to come around on the campus!" ”

"Don't dare? Why wouldn't I dare? This school has completely abandoned me, all because of you! Tell me, why? Your delicate body, I haven't even touched it, and I lost one of my arms in vain, you say, why? ”

I was suddenly so frightened that I was incoherent: "Zhang Zijun, that's your own fault, you, what do you want to do?" ”

The light in the stairwell was dim and yellow, slanting on his gloomy face, and he spat out words without the slightest humanity so coldly: "What for? What do I do, you ask? you, of course! Do you think I'm going to let you go for nothing tonight..."