As we all know, QR codes are made up of two types of pixels, black and white.

It is encoded by the different distributions of black and white pixels in the matrix within a rectangular space. In the pixel position of the matrix, the presence of dots (square dots, dots, or other shapes) represents the binary "1", and the absence of dots indicates the binary "0". The permutations and combinations of dots determine the meaning of the QR code.

At this time, what is presented on the screen of Cheng Nuo's mobile phone is an incomplete QR code picture composed of black and white pixels.

Cheng Nuo simply collected the data of this QR code picture.

The area where the QR code image is displayed in Cheng Nuo's eyes is composed of a total of 400 pixels.

Among them, there are 214 black pixels and 186 white pixels.

Subsequently, Cheng Nuo used the very center of this QR code image as the origin to build a coordinate system. In units of each pixel grid.

Then, the position coordinates of the 214 black pixels clearly appeared in Cheng Nuo's mind.

（1，25），（3，13），（21，21）......

The coordinates of the 186 white pixels are also: (12,3),(21,6),......

After storing a total of 400 sets of data in his brain, Cheng Nuo got up and walked towards the 500 pieces of topological origami.

At this time, the remaining 49 players were still in the process of observing and memorizing.

It is worth mentioning here that in this stage of the challenge, the contestants are not allowed to hold their mobile phones and compare back and forth between the 500 topographic origami papers.

However, as in the first round of the challenge, contestants need to press the "start" button after observing and memorizing in the observation area, and then go to the topological origami area to search for answers.

This event is not only a test of the contestants' observation, spatial and reasoning skills.

It is also an extremely powerful test of the player's memory!

After Cheng Nuo finished memorizing for the first time and walked to the area of five hundred topographic origami, in less than ten seconds, Li Lingxiao also ended the memory stage and ran towards the topographic origami area in small steps.

Subsequently, Li Shiye and He Youjun also memorized their respective QR code images and entered the search stage.

Five hundred pieces of topological origami, two thousand completely different QR codes to expand the picture.

In the case that the strongest brain program group only gives one-fifth of the effective information area, even a world memory master like Li Lingxiao does not dare to take it lightly.

He's okay with his memory. However, the spatial imagination is relatively poor.

Therefore, his strategy is to rely on a strong memory first, memorize part of the QR code given by the question, and remember all the details as much as possible.

Then, go through 500 sheets of topological origami at a quick pace. Exclude those options that are simply not possible.

Finally, in those suspicious objects, the topological origami is folded through spatial imagination for the final screening.

Since it was only the first step of rough sifting, he was able to browse through the origami quickly. Almost every second or two, you can read a topological origami.

On the other side, Li Lingxiao found that there was another voice that was almost as fast as his own observation......

That's Cheng Nuo!

Li Lingxiao looked sideways slightly, looked at Cheng Nuo's speed of almost one second, and muttered in a low voice, "That guy, is his strategy the same as mine?"

In Li Lingxiao's view, Cheng Nuo may have similar strategies as himself.

First, a first rough sieve is carried out, excluding most of the impossible options.

Then, a second time, among the remaining options, find the topological origami that folds out the correct QR code image.

Thinking of this, Li Lingxiao made up his mind and no longer paid attention to Cheng Nuo's side, but put all his energy on screening the answers.

To be honest, Cheng Nuo won the first place in the first two times, and Li Lingxiao was very unconvinced.

As a master of world memory, no matter where he goes, is he not a radiant existence?

Can it be ......

On the stage of "The Strongest Brain", his light was completely obscured by Cheng Nuo's scenery!

In the two rounds of the competition, he became Cheng Nuo's background board.

He has been gifted since he was a child, and he is extremely proud in his heart, how can he be convinced?

"Cheng Nuo, this game, let's see how I beat you!"

Li Lingxiao clenched his fists, his fighting spirit was high, and there seemed to be a flame burning in his chest.

The clock is ticking by.

In the "Topological Origami" room, more than 30 people have finished observing and remembering, and entered 500 topological origami to find the correct answer.

At the observation desk, there are still more than a dozen people staring at the phone screen to remember. Because, they don't have the opportunity to watch it again, they can only remember it as much as possible at a time.

The gap in memory level, at this moment, is undoubtedly revealed!

If you have a weak memory, you will waste a lot of time in this part than other players, resulting in an increase in the total time spent.

Cheng Nuo's side, in fact, was not what Li Lingxiao thought, and he was gradually screened twice.

But...... Every time he observes a piece of topological origami, Cheng Nuo will quickly construct an identical topological origami in his mind, and fold it in two ways. Generate four completely different QR codes.

The most fifth area in the middle of the four different QR codes, with a total of 400 black and white pixel coordinates, will be instantly presented in Cheng Nuo's mind.

No. 1 QR code black pixel position coordinates: (17,2),(11,5)......

No. 2 QR code black pixel position coordinates: (11,8),(6,20)......

QR code size 3......

............

"Not this one. Cheng Nuo shook his head and walked to the next piece of origami.

Often, for an origami paper, Cheng Nuo needs to compare it four times to determine whether there is anything he wants to find in the four QR codes folded.

To be honest, such a huge amount of computing is a great test for ordinary people's brains.

Fortunately, Cheng Nuo's brain has been upgraded, and no matter how fast it runs, the graphics card can't burn.

One origami per second, this speed is Cheng Nuo's normal level.

When Li Lingxiao deliberately competed with Cheng Nuo, it could be said that he had exploded into a small universe, and the speed of the first stage of rough sieving had increased sharply, reaching one per second.

The challenge time is 10 minutes.

So far, none of the contestants have completed the answers. This shows that this challenge is the most difficult of the three!

Li Lingxiao and Cheng Nuo are only a little more than ten short of reading them all.

"That's you, Pikachu!"

The corners of Cheng Nuo's mouth curled, and the original frowning face was replaced by joy.

After looking at more than 480 pieces of topological origami, he couldn't find any origami that matched the coordinates, and even made Cheng Nuo wonder if he had missed one.

Fortunately, among the last dozen or so topological origami, Cheng Nuo found it.

On the other side, Li Lingxiao had already read all the five hundred pieces of origami.

Sorting out the memories in his mind, he turned his head to look at Cheng Nuo, ready to observe the enemy's situation.

I saw that in Li Lingxiao's sight, Cheng Nuo took out his mobile phone and easily clicked a few times on the mobile phone screen.

In the next second, a voice rang out in the room.

"The first place in the topological origami room was generated, Cheng Nuo, in 10 minutes and 11 seconds!"

......

It's still played three times.

"This ......"

Li Lingxiao's body was unstable, he stumbled directly, and was shocked and fell to the ground.

"Didn't you say that you should observe it twice? Why do you do it once...... Done?"

"You're like this, it's hard for me to be shocked!"

Li Lingxiao complained silently in his heart.

Coincidentally, after the challenge, Cheng Nuo, who was about to leave, passed by Li Lingxiao.

Seeing Li Lingxiao who fell to the ground, Cheng Nuo stopped, leaned down, cheered up, "Brother don't cry, stand up and stroke!"

Li Lingxiao: "......"

Li Lingxiao looked at He Youjun, who was like a snake and scorpion to Cheng Nuo in the distance, and wanted to roar: Brother, I understand you!

Li Lingxiao now finally understands He Youjun's feelings at that time.

Cheng Nuo, this guy, is simply ...... It's poisonous!