Escape the Library

According to Jiang Pingce's instructions, the three of Yue Xingwen continued to collect the twin prime cards on this floor. As new rooms were opened, the interference path of this floor was gradually and completely displayed on the maze map in Jiang Pingce's hand.

It was not until all the rooms were searched that Jiang Pingce looked carefully at the labyrinth map——

There are 48 rooms drawn on the drawing. The main road is arranged like a "ten", and there are many fork roads around. There are four elevators in the rooms at the four ends of the upper, lower, left and right, which can lead to other floors.

There are a total of 192 digital cards in this layer, and all the twin prime numbers have been circled by Jiang Pingce. So far, there are 48 sets of 96 twin prime number cards collected. That is, each room has a pair of twin primes.

Among them, the road that Xingwen took had many forks, and 16 pairs were collected; Ke Shaobin and Liu Zhaoqing frequently encountered dead ends, and 8 pairs were collected each; Jiang Pingce collected 16 pairs.

Assuming that this three-dimensional maze is a three-story building with the same structure of the upper, middle and lower floors, Jiang Pingce's reasoning will become much simpler. But in case the structure of different floors is different, the path of the maze will be more complicated.

3 hours and 40 minutes left in the countdown. That is to say, it only took Jiang Pingce 20 minutes to check all 48 rooms on this floor and calculate 192 numbers.

Since Jiang Pingce did not give instructions, the three stopped and waited for news from the research group.

After a while, Jiang Pingce said, "Brother Liu goes back 5 rooms in a straight line, finds the door of 11073, and takes the elevator downstairs." "Young Master Ke goes out from the door of 13011, walks 4 rooms straight to the right, and takes the elevator. Go downstairs."

The two immediately followed Jiang Pingce's instructions and quickly found a room.

Liu Zhaoqing had been in the maze for 20 minutes, and he had already lost his head and couldn't tell the direction, let alone remember which room had an elevator. But he followed Jiang Pingce's advice and walked back 5 rooms in a straight line. Sure enough, he saw the number 11073 posted on the door on the right, and opened the door—it was the elevator room!

They rammed like headless flies in the maze, but Jiang Pingce seemed to be standing in the perspective of God, who could clearly see their moving paths and give the most accurate instructions.

Liu Zhaoqing was so impressed that he couldn't help typing on the research group channel: "Brilliant, I'm going downstairs!"

Ke Shaobin also went downstairs as suggested by Jiang Pingce.

Yue Xingwen asked, "What about me?"

Jiang Pingce said: "Xingwen entered through gate 12077, walked straight forward five rooms, and took the elevator upstairs."

Yue Xingwen was stunned: "I'm going upstairs, not going downstairs?"

Jiang Pingce explained: "Save time. You go upstairs with me, and Senior Brother and Ke Shao go downstairs."

The labyrinth on the third floor, the middle floor has been searched, Jiang Pingce arranged for Liu Zhaoqing and Ke Shaobin to go to the lower floor, he and Yue Xingwen go to the upper floor, and the upper and lower floors can be searched at the same time.

In this way, not only four people and four paths, but also two different planes!

If it weren't for spatial imagination and solid geometry, this would definitely be a complete mess. The three teammates were obviously very confident in Jiang Pingce and did not raise any doubts.

Jiang Pingce separated two pieces of paper and began to draw a map of the lower and upper floors. While typing quickly on the research group channel, he said, "It's still the old rules. After entering the room, report the number clockwise."

Liu Zhaoqing quickly reported four numbers: "101277, 101279, 101281, 101283."

Yue Xingwen couldn't help but feel dizzy when he looked at these numbers. Judging by his mathematical common sense, the numbers ending in 0, 2, 4, 6, and 8 are definitely not prime numbers, because they are divisible by 2. The mantissa is 5, which is usually divisible by 5. It is for this reason that the cards in the maze rarely have the simple question of "it is not a prime number at first sight", and at the back, all end with 1, 3, 7, and 9.

The four numbers listed by Liu Zhaoqing all look like prime numbers, and the difference between the two is 2, which meets the condition of "twin prime numbers". Which two should I choose?

In order to save time, Jiang Pingce directly reported the mantissa: "Choose 79, 81, and enter the door of 81."

Liu Zhaoqing feels that his IQ has been crushed!

Ask him to calculate these four numbers. He must try ÷7, ÷3, ÷11, etc. one by one. For a six-digit number like 101277, it will take at least one minute to calculate the answer. But Jiang Pingce didn't know what method to use, how could the six-digit answer be instantly reported?

This is simply the strongest brain comparable to a computer, right? !

Ke Shaobin also encountered six figures: "107507, 107509, 107511, 107513."

Jiang Pingce said: "Take 07 and 09, and go to door 09."

Ke Shaobin stretched out his hand and took the twin prime number card on the door - also a science student, Jiang Pingce actually counted so fast, he was really ashamed.

Yue Xingwen had completely given up thinking. After entering the room, he entered numbers on the research group channel: "111117, 111119, 111121, 111123."

Jiang Pingce answered quickly: "Take the tail numbers 19 and 21, and go to gate 21."

The exploration of the upper and lower floors officially began.

The research group channel kept flashing information - all three people were reporting the number, and Jiang Pingce was reporting the answer.

The surroundings were extremely quiet, and the channel of the research group was swiped by a large number of numbers, which made people dazzled.

But Jiang Pingce's instructions were always clear and concise. He would tell his teammates which two twin prime cards to take and which door to open. Even if the three teammates are elementary school students, under his precise instructions, they will not make mistakes.

After walking through several rooms in a row, the difficulty increases again.

Yuexingwen reported four numbers: "147677, 147679, 147681, 147683"

He thought that Jiang Pingce would let him win a pair of twin prime cards as before. However, to his surprise, Jiang Pingce suddenly said: "There are no twin prime cards here, go through the door ending in 77."

Yue Xingwen walked into the door and found that the two cards in the room had been removed.

If two cards were removed, it means that he has been in this room before? Yue Xingwen immediately told Jiang Pingce what he found: "Two cards were taken."

Jiang Pingce: "Go back and go to Gate 79."

Yue Xingwen: "There are still two cards that have been taken."

Jiang Pingce suddenly fell into deep thought.

Yue Xingwen was a little worried - the complexity of this maze was beyond his imagination. He obviously didn't turn back, but while walking, how did he come to the room he just went to? Like a "ghost hitting the wall" and go back to the origin?

Yue Xingwen was puzzled: "What is the structure of this maze, I seem to have been to the rooms around this room?"

Downstairs, Liu Zhaoqing and Ke Shaobin saw that Yue Xingwen was in trouble, and stopped at the same time to give Jiang Pingce some time to digest the information and clarify his thoughts.

The three were waiting for Jiang Pingce's response.

After a while, Jiang Pingce said: "The rooms on the upper floor are arranged in the shape of countless "fields", and the rooms are connected to each other. The room that Xingwen just discovered without twin prime numbers should be the center of the entire floor."

He paused and said, "Xingwen, don't move, I'll come to you. Senior Brother and Ke Shao wait a moment."

The three of them stood in the room obediently. After about half a minute, a door on the right side of Yue Xingwen was suddenly pushed open.

Jiang Pingce walked in quickly.

The boy is tall, wearing simple and clean black trousers and a white shirt, with a belt around his waist, which sets off his slender and straight legs. The surrounding walls are like a deep starry sky, and the walls are full of stars. When he pushed the door in from the side, it was as if he was walking from the starry sky.

Yue Xingwen turned back, met his calm eyes, and suddenly felt very at ease.

This labyrinth, no matter how complicated it is, with Ah Ce there, what is there to worry about?

Yue Xingwen greeted him with a bright smile: "In such a messy maze, how could you find me in 1 minute?"

Jiang Pingce's lips curved slightly, and his gaze towards Yue Xingwen was very gentle: "It seems that my inference is correct, this floor should be a 'Tian'-shaped labyrinth with 49 rooms in total. The structure, the room we are in now, is the most central room of the 7x7 huge square maze."

Yue Xingwen seemed to understand, but patted Jiang Pingce's shoulder lightly: "Amazing! My brain has become a mess, how did you analyze it?" He looked down at the map in Jiang Pingce's hand. ...

It's so scary!

The three sheets of paper represent the maps of the upper, middle, and lower floors, respectively. The asterisks represent the elevators. The densely packed square rooms are connected together, marked with countless numbers and directional arrows.

Yue Xingwen found that he couldn't even read the map...

Jiang Pingce said: "It's more complicated to explain. Let's find the prime numbers first, hurry up and finish the test, and I'll give you a slow analysis after we go out."

Yue Xingwen agreed: "Yes! The clearance time of the labyrinth must be linked to the test score. I don't think I can understand your explanation now. What should I do next?"

Jiang Pingce pointed to the middle of the map and said, "Our current position is the center of the upper labyrinth. If we look for the way in the opposite direction from the center point, we will not miss any room. You go to the door on the right, and I go to the left. "

Yue Xingwen nodded, and Jiang Pingce continued: "After entering the door on the right, walk three rooms in a row, turn left, and report the number to me."

Yue Xingwen turned around and walked over, separating from Jiang Pingce.

Jiang Pingce said on the research group channel: "Ke Shao and senior brother continue."

The two people on the lower floor continued to investigate, and soon, Liu Zhaoqing also encountered a room, and there appeared four numbers that looked like prime numbers, but were not prime numbers at all.

Jiang Pingce said: "The room where the senior brother is located does not have a twin prime number. It should be the center point of the lower floor. Master Ke, go out from the door directly in front of your current room, walk three rooms in a row, and then turn left to see if you can follow the senior brother. Convergence."

Ke Shaobin did as he did.

After a while, the two of them typed on the research group channel: "Meeting!"

Liu Zhaoqing: "...Fantastic, how did you make us meet in the labyrinth?"

Jiang Pingce didn't have time to explain, so he simply said: "The upper and lower structures are the same. Now start looking for a way as fast as possible. Senior brother goes to the door of 171083, Ke Shao walks to 171081, each person walks straight forward three rooms, and reports the number along the way. "

After the two of them walked through three rooms each, Jiang Pingce continued: "Senior brother turn left, Ke Shao turn right, and report the number."

"Senior brother took 192191 and 192193, and walked straight to the right for seven rooms."

"Young Master Ke turned to the left and went straight forward seven rooms..."

The three have almost become "card-finding tool people", and Jiang Pingce can even accurately grasp their orientation!

Liu Zhaoqing walked 7 rooms in a straight line and found that there was a dead end in front of him, as did Ke Shaobin and Yue Xingwen. I wonder how Jiang Pingce figured out that there was a dead end at the end of the 7 rooms?

If there is a camera from the perspective of God at this time, you can find that the huge three-dimensional maze is like a three-story structure filled with square rooms. Under the command of Jiang Pingce, they make S-shaped movements in four directions. ...

Such a search will not miss a single room.

After a while, Yue Xingwen suddenly said: "I saw a room with an elevator in it, I can only go up."

Jiang Pingce said: "Xingwen, what you found is the exit."

Yue Xingwen: "..."

Find the exit, at least pass this class. He glanced at the countdown in the upper right corner. They only spent 1 hour and 20 minutes of the 4 hours of exam time.

Jiang Pingce said, "Senior brother, go three rooms forward, turn left and go two rooms, take the elevator to go up two floors, go forward five, and then turn right." Building, go forward four times and then turn left."

He said that these are like tongue twisters. It can be seen that Jiang Pingce already has a complete three-dimensional maze map in his hands, so that he can accurately indicate the action routes of his teammates.

After a while, Jiang Pingce came to the room where Yue Xingwen was again.

It didn't take long for Liu Zhaoqing and Ke Shaobin to come to this room exactly to meet.

The three looked at each other, shocked in their hearts, and didn't know what to say for a while.

Yue Xingwen asked: "How many pairs of twin primes have been collected in total?"

Jiang Pingce didn't need to count the cards in the hands of his teammates, he directly reported the number: "144 pairs, all together. Let's go."

He pressed the shutter button, and the three followed him into the elevator, which could only go up. Soon there was a "ding" sound, and the moment the elevator stopped, a mechanical voice sounded in the ears of the four at the same time: "Congratulations to the c-183 research group for successfully leaving the prime number maze. It took 1 hour and 30 minutes to collect the twin prime number 288. The exam is over, the points are being settled…”

Research group: c-183

Mathematics Academy Course: Prime Number Maze

Credits: 3

Clearance score: 100 points (perfect clearance)

Additional questions: 30 points (all twin primes are collected)

Total score: 130 points

Earn points: 3x130=390 points

Research group bonus: Group c points bonus x 1.5 times, each person will finally get 585 points

The failure rate of this course: 65%

Click the [link] to view the grades of the course

Open the link, their c-183 research group is impressively ranked first.

The clearance score is 100 out of 100, and no one can surpass it!

I remember that Yue Xingwen joked with Jiang Pingce the night before: "If there is Pingce, just get full marks."

I didn't expect this joke to come true...

Jiang Pingce really single-handedly took three teammates to get the amazing result of clearing the customs with full marks!