Live broadcast: Starting from becoming a hacker to encourage learning

“Well, this software virus is only 31M, and the structure looks quite simple. ”

“I don’t know what its function is. ”

As Jack spoke, he called up the translation function and looked up the name of the software.

Sleep Pikachu.

What is it?

Sleep?

Pikachu?

Jack didn’t understand it just by looking at the name of the virus software.

His blood-red eyes revealed a deep confusion.

He turned his head to look at Yuichiro Koizumi to the side.

saw that he was also confused.

“What kind of virus is this?”

He asked.

Yuichiro Koizumi looked at the software and said with some confusion: “Mr. Jack…”

“This software… It must be sleep-related, right?”

Jack frowned slightly: “Sleep?”

When he heard this, he didn’t understand it either.

Why do you want to make such virus software?

Do hacker geniuses like to make viruses like this?

Although Jack had so many doubts, he didn’t think much about it.

He sat up slightly in front of the computer, then fixed his eyes on the sleeping Pikachu on his desk.

“Alright, no matter, let’s study the source code of this software first. ”

As he spoke, Jack double-clicked to open the software.

A pop-up window appeared in front of him.

I’m your instructor “Pikachu”. 】

[As a trainer, not only must your own strength meet the standards, but your physical health must not be neglected. 】

[From now on, your regular sleep will be supervised by my Pikachu.] 】

If you refuse to go to bed on time, or wake up on time, Pikachu will use the mandatory skill “100,000 Volts”. 】

[Friendly reminder, the power is controlled by Pikachu, and it will not harm your health, and it will cause some discomfort at most.] 】

When he saw the translated pop-up, Jack was already stupid.

“Sleep regularly?”

Jack shook his head with a smile and began to bang at the running window.

“Mr. Koizumi, let’s take a look at the defense system of this virus first. ”

“Let’s see if it’s the same as the previous ‘Punishment No. 1’, which is a defense system that absorbs the growth of the virus. ”

Yuichiro Koizumi heard Jack’s words, and he also tossed aside the window of sleeping Pikachu and began to bang at the window.

Jack’s hands also began to pound rapidly, lines of code appeared under his hands, and commands were run.

Soon, his information flowed before the virus software’s defenses.

Seeing the defense system this time, he breathed a sigh of relief.

And it is the defense system of the previous “Punishment No. 1” virus.

While relieved, he was also a little disappointed.

If it was the defense system of the “Punishment No. 1″ virus, the whole thing would have become much easier.

This defense system is just a puppet defense system that is not common in the world, but it is not uncommon.

This puppet defense system is powerful, but it is also equally flawed.

To give a sequence of length n, each point needs to place a guard tower or a puppet.

The cost of placing the guard tower at the ith point is a_i, and the cost of placing the puppet is j-i, where j is the first guard tower to the right of i;

It only needs to go through a certain amount of calculations to crack it.

For the average hacker, this step is as difficult as ever.

But for top hackers like Jack and Yuichiro Koizumi, there is no pressure.

“1≤n≤10^6,1≤a_i≤10^9……”

“After the introduction of naïve DP, it will be optimized with slope…”

In other words, the inequality deduced by slope optimization must satisfy the requirement that there is no term related to i on the left and a straight line related to i appears on the right. Because the left side is going to become a bunch of dots, and the right side is a line that cuts the convex hull. ”

Jack muttered to himself, his hands tapping quickly on the keyboard.

All the preparations were done, and he finally output a line of command code.

The code thief is short.

#includecstdio

usingnamespacestd;

Before he could click OK, Yuichiro Koizumi on the side suddenly let out a scream of surprise.

“Mr. Jack, this virus popped up a window for me, saying it’s eleven o’clock at night, tell me to go to bed quickly!!”

Yuichiro Koizumi’s voice reached Jack’s ears.

At this time, such a pop-up window also appeared in front of Jack.

[Pickup Pickup Pickup Pickup!!It’s already 11 o’clock at night!!Hurry up and go to bed!!]

Jack looked at the pop-up window in front of him, and then at the scorching sun outside.

He was simply drunk.

“The time of this software is Xia Guo time, right?”

“It’s eleven o’clock in the morning on our side!!”

“What sleep are you going to get at this time!?”

“Leave him alone!!”

After Jack finished speaking, he clicked OK.

And then—

Lines of new code are flashed out of his run window.

typedeflonglongLL;

constLLmaxn=1e6+5,esp=1e-6;

LLn,a[maxn],f[maxn],y[maxn],s[maxn],cur;

LLq[maxn],h,t;

……

printf(%lldn,f[n]);

return0;

Seeing this code, others are stupid!!

Attack Invasion Failed!!

Why is this happening!!

Jack hurriedly rechecked the puppet defense system, and then he understood…

“He actually added an algorithm to the original puppet defense system!?”

“Hundreds of more answers than the ones already existed!?”

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“Fake!!”

Jack gritted his teeth in anger.

It’s too much!!

Originally, the algorithm system of the puppet defense system was very simple, and they could easily break it.

Who would have thought that “Master Su Susu” directly changed the puppet defense system, not only improving and updating its original algorithm defense function, but also directly increasing the complexity by hundreds of times.

Where can ordinary people do this?

Jack was predictable.

If this puppet defense system spreads, it will definitely shock everyone.

Jack’s gaze changed as he looked at the defense system in front of him.

He had already begun to wonder how “Master Su Susu” had done this.

To know.

This algorithm, even he felt helpless.

If he learns this way of editing algorithms, Jack believes that his strength will definitely be able to make a qualitative leap.

At this time, Yuichiro Koizumi sighed.

Jack turned his head to look at his computer screen and found that his run window also had a calculation error, and the attack failed to attack the intrusion code.

There are no surprises.

If Yuichiro Koizumi can break through it in one stroke, this will surprise him.

“Mr. Jack, I can’t do it, I can’t understand this defense system at all. ”

Yuichiro Koizumi held his head in pain and rubbed his head.

Jack silently said a rookie in his heart, and then stopped caring about him.

He’s going to break it himself!!

At the same time, a sleep reminder from Pikachu came again.

[Pickup Pickup Pickup Pickup!!It’s already 11 o’clock at night!!Hurry up and go to bed!!]

[Work so hard, all the jobs of programmers in the world will be snatched up by you alone!!]

Jack left it alone and continued typing the code.

A minute later.

His eyes changed slightly.

“Oh, it’s kind of interesting, there are so many changes, and you still want to trick me? No way!!”

Jack sat up a little straighter, he was going to break through the defense line of the virus in one fell swoop!!

This allows you to see the source code and gain a deeper understanding of this new Trojan defense system.

Ten minutes later.

He was stunned.

One algorithm result is set on top of another algorithm result.

If this goes on repeatedly, the final algorithm result has not reached more than 300, so he has to re-run it more than 300 times!!

These more than 300 times, even if he experiments over and over again, it is impossible to do it!!

This is too bad!!

What a big fuss!!

There’s no such bullying!!

Jack was completely stunned.

The gods who dare to love others already like to play like this…

A different tune.

It’s amazing!!

Jack gritted his teeth, although there are so many algorithms and so many results, but after all, it is just a little troublesome!!

He felt that he could still break it.

As a White House cybersecurity expert, it is naturally impossible for him to admit defeat when he is challenged like this!!

You can’t be insulted like this!!

Isn’t it just a puppet defense system that has become a little more troublesome?

Watch me break you down.

Ten minutes later!

Jack’s forehead was already sweating profusely.

Thirteen minutes later!

His face turned pale, his fingers tapped quickly on the keyboard, and his body trembled slightly, twitching a little.

It’s so nervous!

Sixteen minutes!

For.

I just heard the computer ring like this.

The expected cracking success code did not appear, but…

[Look at me – 100,000 volts!!]

Hiss~~

Every time ~~~

Before Jack could react, he saw a bright electric flash on the computer next to him.

Yuichiro Koizumi’s body stiffened suddenly, and then he screamed “ahhh

The body also kept shaking with the scream!!

Jack is a little uneasy and wants to leave…

But it’s too late!!

I saw an electric current coming from the mouse wire.

On the keyboard, it is also steaming with electric light!!

Sparks and lightning all the way!!

Every time ~~

An electric current struck him like lightning, and it quickly bombarded him!!

Jack screamed: “Ahhhhhhh

The sound is extremely miserable!!

And then—

The body is also shaking rapidly.

After a while.

There was an electric glow from both of them.

Thoroughly… Fall asleep…

Hearing the sound, the security personnel who hurriedly rushed over hurriedly rushed in.

When I came to the computer, I saw two staggering Jacks and Yuichiro Koizumi.

They looked at each other.

This Nima…

Research a virus, can you still sleep?

The security guards were stupid.