Escape From the Library

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

Jiang Pingce didn't look carefully at the map of the maze until all the rooms had been searched——

There are 48 rooms drawn on the drawings. The main roads are arranged like a "ten" and there are many fork roads around them. 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 on this layer, and all the twin prime numbers have been circled by Jiang Pingce. The number of twin prime number cards collected so far is 48 groups and 96 cards.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 in the direction they walked, and each collected 8 pairs; Jiang Pingce collected 16 pairs.

Assuming that this three-dimensional maze has three floors, and the upper, middle, and lower floors have the same structure, Jiang Pingce's reasoning will become much simpler.But if the structure of different floors is different, the path of the maze will be more complicated.

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

Since Jiang Pingce did not give instructions, all three of them stopped to wait for news from the research team.

After a while, Jiang Pingce said: "Brother Liu went straight back 5 rooms, found the door 11073, and took the elevator downstairs." "Ke Shao went out from the door 13011, walked straight 4 rooms to the right, and took the elevator Go downstairs."

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

After 20 minutes of walking in the maze, Liu Zhaoqing was already dizzy and couldn't tell the direction, let alone remember which room had the elevator.But following Jiang Pingce's prompt, he went straight back five rooms, and he saw the number 5 posted on the door on the right, and he opened the door—it was the elevator room!

They ran around like headless chickens in the maze, but Jiang Pingce seemed to be standing in the perspective of God, able to clearly see their moving paths and give the most accurate instructions.

Liu Zhaoqing admired it so much that he couldn't help typing on the research group channel: "Nice, I'm going downstairs!"

Ke Shaobin also followed Jiang Pingce's prompt and went downstairs.

Yue Xingwen asked, "What about me?"

Jiang Pingce said: "Xingwen enters through door 12077, walks straight forward for five rooms, and takes the elevator upstairs."

Yue Xingwen was startled: "I'm going upstairs, don't I go downstairs?"

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

In the three-story maze, 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 went to the upper floor. The upper and lower floors can be searched at the same time.

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

If the spatial imagination and three-dimensional geometry are not strong enough, it will definitely be completely messed up.The three teammates obviously had great confidence in Jiang Pingce and did not raise any doubts.

Jiang Pingce took out two pieces of paper and began to draw the maps of the lower and upper floors, while quickly typing on the research group channel: "It's still the old rule, count clockwise after entering the room."

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

越星文看着这些数字就忍不住头晕——以他的数学常识来判断，尾数0、2、4、6、8的肯定不是质数，因为能被2整除。尾数是5的，通常能被5整除。也正因此，迷宫中的卡片极少出现“一看就不是质数”的简单题目，到了后面，全都是1、3、7、9结尾。

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

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

Liu Zhaoqing felt that his IQ had been crushed!

Ask him to calculate these four numbers, he will definitely have to ÷7, ÷3, ÷11, etc., try one by one, for a six-digit number like 101277, it will take at least 1 minute to calculate the answer.But Jiang Pingce didn't know what method he used, and the six-digit number could report the answer in an instant?

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

Ke Shaobin encountered all six-digit numbers: "107507, 107509, 107511, 107513."

Jiang Pingce said: "Take 07 and 09, and enter gate 09."

Ke Shaobin reached out and took down the twin prime number card on the door—he was also a science student, but Jiang Pingce was really ashamed of himself for counting so fast.

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

Jiang Pingce replied quickly: "Take the numbers ending in 19 and 21, and enter gate 21."

The exploration of the upper and lower floors has officially begun.

The research group's channels kept sending out information—all three people were reporting the numbers, and Jiang Pingce was reporting the answers.

The surroundings were extremely quiet, and the research group's channels were swiped by a large number of numbers, making people dazzled.

But Jiang Pingce's instructions are always clear and concise. He will 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.

Yue Xingwen reported four numbers: "147677, 147679, 147681, 147683"

I thought that Jiang Pingce would let him take a pair of twin prime number cards like before, but unexpectedly, Jiang Pingce said suddenly: "There are no twin prime number cards here, go to the door with the end number 77."

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

Two cards were removed, so that means he has been to this room before?Yue Xingwen immediately told Jiang Pingce his discovery: "Two cards have been taken."

Jiang Pingce: "Turn 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 walking, why did he come to the room he had been to just now?Just like "ghost hits the wall", went around and returned to the original point?

Yue Xingwen was confused: "What is the structure of this maze? I seem to have been to all 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 clear his mind.

All three were waiting for Jiang Pingce's response.

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

He paused, and said: "Xingwen, stay where you are, I'll come to you. Senior brother and Ke Shao wait a moment."

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

Jiang Pingce walked in quickly.

The boy was tall, wearing simple and clean black trousers and a white shirt, with a belt around his waist, which set off his slender and straight legs.The surrounding walls were like a deep starry sky, and the walls were dotted with stars. When he pushed the door in from the side, it was as if he had walked from the starry universe.

Yue Xingwen turned his head and met his calm eyes, and suddenly felt very at ease in his heart.

No matter how complicated this maze is, with Ah Ce around, what is there to worry about?

Yue Xingwen walked forward with a bright smile: "In such a chaotic maze, you can actually find me within 1 minute?"

The corners of Jiang Pingce's lips curved slightly, and he looked at Yue Xingwen with gentle eyes: "It seems that my inference is correct, this floor should be a 'field'-shaped maze with 49 horizontal and vertical rooms The structure, the room we are in now, is the central room of the huge 7x7 square maze."

Yue Xingwen seemed to understand, and lightly patted Jiang Pingce on the shoulder: "Awesome! My brain is already in 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, the asterisks represent the elevators, and the densely packed square rooms are connected together, marked with countless numbers and direction arrows.

Yue Xingwen found that he couldn't even understand 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 will analyze it for you after I go out."

Yue Xingwen agreed: "That's right! The maze clearance time must be linked to the test score. I don't think I can understand your explanation now. Tell me, what should I do next?"

Pointing to the middle of the map, Jiang Pingce said, "Our current location is the center of the upper labyrinth. If you find your way from the center to the outside, you won't 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 through three rooms in a row, then turn left, and report the number to me."

Yue Xingwen turned 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 came across a room where four numbers that looked like prime numbers but were actually not prime numbers appeared.

Jiang Pingce said: "The room where the brother is in does not have twin prime numbers, it should be the center point of the lower floor. Ke Shao, go out from the door directly in front of your current room, walk through three rooms in a row, then turn left, see if you can talk to the brother confluence."

Ke Shaobin followed suit.

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

Liu Zhaoqing: "... Awesome, how did you make us meet in the maze?"

Jiang Pingce didn't have time to explain, so he simply said: "The structure of the upper and lower floors is the same. Now start to find the way as quickly as possible. Brother, go to the door of 171083, and Mr. Ke goes to 171081. Each of them walks straight forward for three rooms and counts along the way. "

After the two walked through three rooms each, Jiang Pingce continued: "Brother, turn left, Young Master Ke, turn right, report the number."

"Brother, take 192191, 192193, go straight to the right and walk seven rooms forward."

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

The three of them have almost become "card finders", and Jiang Pingce can even accurately grasp their faces!

After Liu Zhaoqing walked 7 rooms in a straight line, he found that there was a dead end in front of him. The same was true for Ke Shaobin and Yue Xingwen. I wonder how Jiang Pingce calculated that the end of the 7 rooms was a dead end?

If there is a camera with a God's perspective at this time, you can find that the huge three-dimensional maze is like a three-story structure full of square rooms. Under Jiang Pingce's command, they move in an S-shape in four directions. ...

This search method will not miss any room.

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

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

Yue Xingwen: "..."

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

Jiang Pingce said: "Brother, go three rooms forward, turn left and walk two rooms, take the elevator up two floors, go forward five, then turn right." Upstairs, go forward four times and then turn left."

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

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

Not long after, Liu Zhaoqing and Ke Shaobin unexpectedly came to meet in this room.

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

Yue Xingwen asked, "How many pairs of twin prime numbers have you collected?"

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

He pressed the shutter button, and the three of them followed him into the elevator, which could only go upwards.There was a "ding" sound soon, and the moment the elevator stopped, a mechanical voice sounded in the ears of the four people at the same time: "Congratulations to the c-183 research team for successfully leaving the prime number maze. It took 1 hour and 30 minutes to collect the twin prime number 288." One. The exam is over, and 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 (collect all twin prime numbers)

Total score: 130 points

Earn points: 3x130=390 points

Research group bonus: group c points bonus x1.5 times, each person finally gets 585 points

Failure rate of this course: 65%

Click on the [link] to view the grade ranking of the course

Open the link, and their c-183 research group is ranked No.1.

The customs clearance score is 100 out of [-], no one can surpass it!

I remember that Yue Xingwen joked with Jiang Pingce the night before yesterday: "With Pingce here, you can get full marks."

Unexpectedly, this joke turned out to be true——

Jiang Pingce really achieved the astonishing result of clearing the level with a full score with his three teammates on his own!