Escape the Library

A library with 6 floors underground and 13 floors above ground, where will the exit be?

The possibility of exit in the examination room has been ruled out by everyone through analysis and practice, because once there is an exit in the examination room, tens of thousands of students, in case someone finds this secret door during the examination process, it will result in insufficient credits 100 bugs that left the library.

Ke Shaobin opened his laptop and wrote a floor map for everyone to observe.

The basement of the library is full of functional areas - sports center, shopping plaza, canteen, dormitory, research group, database.

In the dormitory area, in order to find someone, they teleported back and forth more than a dozen times to find out the distribution of the petal-shaped dormitory, and according to the data monitored by the small map, they found the (0, 0, -3) coordinates in the hidden location, which is A central patio runs through the entire library building.

All floors are accessible through a central patio.

There is no exit in the test room, so, will there be an escape route at the connection between the test room and the test room? No one has noticed this.

Yue Xingwen looked at Ke Shaobin's model diagram in the computer and said, "Let's do it, let's start from the 12th floor and walk through all the floors again."

Liu Zhaoqing said with a headache: "When we walked into the medical school on the first floor just now, it was directly in the examination room area. The examination did not start, and those NPCs were all in standby mode. Now, the whole library has entered the examination time, and we go to every floor. Don't you have to pass every exam once?"

Brother Liu's concerns are also justified.

The library is now exam time. When they entered the School of Architecture just now, they directly opened the "City Collapse" exam room. If they walk through each floor, each exam room will trap them for a period of time, and if they encounter a reasoning class, they may have to stay in the exam room for ten days and a half months...

If this goes on, it will take a year to get out of the library!

Zhuo Feng asked, "Is there a way to walk all over the floor and avoid the exam room?"

Everyone lowered their heads and thought carefully. Suddenly, Jiang Pingce said: "We can use Qin Lu's plate transposition skills to accurately set the coordinates and directly transpose them into the gap between the examination rooms."

He pointed to the three-dimensional graphics in Ke Shaobin's computer.

The size of the central patio is fixed throughout the library. It is a 10m x 10m square area with a circular upward staircase, extending from the dormitory area on the -3rd floor to the computer school on the 13th floor.

There is a door in each of the four directions of the stairs. From the experience of the medical school, these four doors correspond to the four examination rooms. No matter which door they enter, they will form a "return"-shaped passage after a circle. Go back to where you started.

Zhang Xiaonian asked earnestly: "Brother, you mean that the entire library is a regular cubic structure, and the area of ​​each floor is actually the same? We can calculate the length of each corridor based on the location of the central patio. ?"

Jiang Pingce nodded: "Well, whether the library is a regular building or a special-shaped building with different floors, we will find out after verifying it."

"The laser corridor of the School of Computer Science, I calculated the coordinates when I went in just now, and the length is the same as the first corridor of the medical school." Ke Shaobin paused and said, "The area in the back, because the small image is out of control, cannot be controlled. I don't know the exact data for measuring coordinates."

Jiang Pingce said: "When we entered the medical school, the library was in a daily state, and the examination had not yet started. Therefore, the model of the medical school is the most realistic library, and the data is also the most accurate. The length of the four corridors is small. Is there any measurement here?"

Zhang Xiaonian nodded immediately: "The four corridors are all 50 meters long."

Ke Shaobin adjusted the data in the laptop, and the three-dimensional model of the entire library was quickly displayed in front of everyone. A closer look reveals that the building is actually composed of a hollow patio in the middle and a "back"-shaped corridor around it, with each floor covering an area of ​​2,500 square meters.

Four doors, right in the middle of the four corridors.

If they pushed the door directly in, they would be forcibly pulled into the examination room.

If all floors follow this rule, then everyone can follow Jiang Pingce's method, move directly and precisely, and skip the examination room area in the corridor!

Yue Xingwen said: "Let's search from top to bottom, let's go to the 12th floor first."

Qin Lu said: "I have used up the number of plate transposition skills. I will reset it with the globe." She took out the globe and used the skill "rotation" to make the globe turn around, changing day and night, and the "cooling time" in everyone's hands All 24 hours" big moves are refreshed.

Qin Lu's "plate transposition" also recovered 12 times, and everyone set off again.

Everyone followed the stairs to the 12th floor, and they found four doors. Jiang Pingce looked at Qin Lu: "We mark the azimuth by going up north, down south, left west right east, and first move 25 meters in the due west direction."

The door is in the middle of the corridor. The corridor is 50 meters long. If you teleport to the west for 25 meters, you will reach the end of the west corridor. If there is no accident, you can skip the examination room.

Qin Lu took out the globe and entered the data——

Everyone suddenly flashed before their eyes, and collectively appeared at the corner of the junction of the two corridors.

Yue Xingwen looked back and saw the words "School of Humanities" written behind him and "School of Film" in front. They came to an open space at the junction of the two academies.

Everyone hurriedly searched for the secret door at the connection of the corridor, but nothing came of it.

Jiang Pingce said: "Next, go 50 meters north."

Qin Lu was operating on the globe, and with a flash in front of them, they came to the corner of the corridor again. One side was the Film Academy and the other was the Sports Academy. After the examination room, it was not pulled into the copy.

After teleporting 50 meters to the due east again, everyone came to an open space, which is the junction of the Physical Education College and the elective course examination room.

Yuexing Wendao: "It seems that the 12th floor is the humanities college in the west corridor, the film school in the north corridor, the sports school in the east corridor, and the elective course examination room in the south. The internal structure of medical schools is very similar."

Jiang Pingce said thoughtfully: "In the structure of the library, each corridor is 50 meters long. After the exam starts, we will be teleported to other spaces... These corridors are equivalent to teleportation points."

Yue Xingwen guessed: "It seems that the four corridors on the 11th floor are likely to be the structure of the School of Physics, elective courses, engineering schools, and elective courses."

Xin Yan said: "The 10th floor is the three corridors of the School of Chemistry, the School of Business, and the School of Foreign Languages, plus one corridor for elective courses?"

In order to verify everyone's guesses, after they left the 12th floor, they went to the 11th and 10th floors in the same way. Qin Lu's "plate transposition" can be used 12 times, just finishing these three floors.

The result was as they expected—

On each floor, four corridors form a complete closed loop.

If there are many colleges on some floors, then one college occupies one corridor, and the extra is used as the exam room for elective courses; on some floors, there are few colleges, and a single college occupies 4 corridors, or two colleges are divided into half.

No matter how it changes, the building structure inside the library remains the same, which is what Jiang Pingce called the "regular cube building", and there are no strangely shaped floors.

Qin Lu's plate transposition times have been used up, and there is still no on-site verification from the second to the ninth floor, but Jiang Pingce said: "I don't think it is necessary to verify the other floors."

Everyone also felt that they went on like this, layer by layer, but in the end they achieved nothing. It is very likely that their method was wrong from the beginning.

The exit of the library is not inside the examination room of any course.

Nor at the junction of the examination rooms on any floor.

Where will that be? Is there any hidden area in the whole building that they haven't discovered?

At this moment, Yue Xingwen's eyes suddenly lit up and said, "Do you remember how you entered the library?"

Jiang Pingce said: "I went back to the library at night to search for documents. After walking through the gate, I was pulled into the database."

Zhuo Feng followed closely: "Manluo and I came together. We also went back to the library after 9:30 p.m. to borrow books. When we entered the door, we realized that something was wrong, and the moment we entered, we were separated."

Yue Xingwen then asked: "Before entering the library, did you walk down some steps? It's not the same as the usual library steps? I thought at the time that the steps seemed to be a few floors higher, but I didn't count them carefully. , I thought it was an illusion."

Hearing this, Liu Zhaoqing suddenly slapped his forehead: "Yes! The steps are really weird, and I also felt that something was not right at the time. Usually it only takes four or five steps, but I took one more step that day. But I was in a hurry to go back and get it. I didn't think about the water glass that I dropped."

When Jiang Pingce heard this, he finally understood the meaning of Yue Xingwen: "You mean, there are mezzanine floors in the library that we haven't been to yet?!"

Yue Xingwen nodded: "If we want to go out, we have to reverse how we got in at the time. The entrance is the exit. And all of us, after entering the library, the first place we arrive..."

"It's the library database!" Ke Shaobin responded actively, "It's a closed space with a particularly high floor height filled with professional books. The system asks us to take the entrance exam and select skill books from the book library after passing. Then, everyone. Will take the elevator to the medical school on the first floor and take the exam.”

Zhang Xiaonian said: "The height of the database is about 5 meters. It's like a common lft apartment, surrounded by wooden bookshelves."

The more everyone talked, the more they felt that there was a great possibility of a hidden interlayer here!

The floor height of 5 meters, the wide hall, and the dazzling crystal lamps hanging down - the place where everyone first came to the library, is it really just a pile of books?

Jiang Pingce looked at Yue Xingwen with relief and said, "I understand. The exit of the library is not on any floor marked by the elevator, but on the mezzanine hidden between the -1st floor and the 1st floor - the 0th floor. "

Yue Xingwen smiled and nodded: "Yes, that is, the origin (0, 0, 0) in the three-dimensional coordinate system."

How to get in, how to get out.

At this point, they didn't finally understand until Xingwen mentioned the experience of being pulled into the library at first!