Escape From the Library

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

The possibility of an 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, if someone finds this secret door during the examination, it will result in insufficient credits 100 but left the library bug.

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

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

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

The various floors are accessed through a central patio.

There is no exit in the examination room, so, will there be an escape route at the connection between the examination room and the examination room?This point has not been noticed.

Yue Xingwen looked at Ke Shaobin's model diagram on the computer, and said, "Well, let's start from the 12th floor and go through all the floors again."

Liu Zhaoqing said with a headache: "Just now when we walked into the medical school on the first floor, it was directly in the examination room area. The examination hadn't started yet, and those NPCs were all on standby. Now, the entire library has entered the examination time, and we walked 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 go through every floor, every exam room will trap them for a period of time, and they may have to stay in the exam room for ten and a half months when they encounter a reasoning class...

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 floors and avoid the examination room?"

Everyone lowered their heads and thought carefully, and suddenly, Jiang Pingce said: "We can use Qin Lu's panel transposition skill to precisely set the coordinates and directly transpose to the gap between the examination rooms."

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

In the whole library, the size of the central patio is fixed. It is a square area of ​​10 meters by 10 meters, with a circular upward staircase, extending from the dormitory area on the -3rd floor to the School of Computer Science on the 13th floor.

There is a door in each of the four directions of the stairs. Judging 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 "back"-shaped passage after going around. Go back to the origin.

Zhang Xiaonian asked seriously: "Brother, what do you mean, the whole library is a regular cubic structure, and the area of ​​each floor is actually the same? We can calculate the length of each corridor according to the position 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 know after verification."

"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 School of Medicine." Ke Shaobin paused, and said: "The area behind is out of control because the small map is out of control. Measuring the coordinates, I don’t know the specific data.”

Jiang Pingce said: "When we entered the medical school, the library was in a daily state and the exam 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, small Is there a 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.If you look closely, this building is actually composed of a hollow patio in the middle and a "back"-shaped corridor around it. The area of ​​each floor is 2500 square meters.

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

If they push the door directly, they will be forcibly pulled into the examination room.

If all the floors follow this rule, then everyone can follow Jiang Pingce's method to move directly and accurately, skipping 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 use the globe to reset it." She took out the globe and used the skill "rotation" to make the globe turn around, changing day and night, and everyone held the "cooling time". 24 hours" all the big moves are refreshed.

Qin Lu's number of "plate swaps" also recovered to 12 times, and everyone set off again.

Everyone followed the stairs to the 12th floor and found four doors.Jiang Pingce looked at Qin Lu: "Let's mark the orientation according to the direction of up north, down south, left west and right east, and first move 25 meters to the due west."

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

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

Suddenly, everyone's eyes flickered, and they appeared collectively at the corner of the junction of the two corridors.

Yue Xingwen looked back, and there were four big characters "School of Humanities" written behind him, and "School of Film" in front of him. They came to an open space at the junction of the two colleges.

Everyone hurriedly searched for the hidden door at the junction of the corridors, but found nothing.

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

Qin Lu manipulated the globe, and with a flash in front of her eyes again, they came to the corner of the corridor again. On one side was the School of Film and on the other side was the School of Physical Education. After leaving the examination room, he was not pulled into the copy.

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

Yue Xingwen said: "It seems that the 12th floor is the School of Humanities in the west corridor, the School of Film in the north corridor, the School of Physical Education in the east corridor, and the elective course examination room in the south. The four corridors form a complete back-shaped closed loop. The internal structure of the medical school 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 another space... These corridors are equivalent to teleportation points."

Yue Xingwen guessed: "From this point of view, the four corridors on the 11th floor are likely to be a structure such as the School of Physics, elective courses, engineering college, and elective courses."

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

In order to verify everyone's guess, after they left the 12th floor, they followed the same method to go to the 11th and 10th floors. Qin Lu's "panel swap" can be used 12 times, just to complete these three floors.

The result was as they expected——

On each floor, there are four corridors forming a complete closed loop.

If there are many colleges on some floors, one college will occupy one corridor, and the extra ones will be used as elective course examination rooms; on some floors, there will be fewer colleges, and a single college will occupy 4 corridors, or two colleges will be divided into half.

No matter how it changes, the internal architectural structure of the library remains unchanged, which is what Jiang Pingce calls a "regular cube building", and there are no strange and strange-shaped floors.

Qin Lu's plate transposition times have been used up, and there are still floors 2 to 9 left to verify on the spot, but Jiang Pingce said: "I don't think it is necessary to verify the other floors."

Everyone also felt that they went down layer by layer in this way, but in the end they got 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 is it at the junction of the examination room on any floor.

Where will that be?In the whole building, is there a hidden area that they haven't discovered?

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

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

Zhuo Feng followed closely and said, "Man Luo and I came together, and we went back to the library to borrow books after 9:[-] pm. When we entered the door, we found something was wrong. Moreover, the moment we entered the door, we were separated."

Yue Xingwen then asked: "Before entering the library, did you walk through a set of 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 head: "Yes! The steps are really weird. I also felt that something was wrong at the time. I usually only need four or five steps to walk up the steps. I took an extra step that day. But I was in a hurry to go back and get it. I didn't think about the water glass I dropped."

When Jiang Pingce heard this, he finally understood what Yue Xingwen meant: "You mean, there is a mezzanine in the library that we haven't been to?!"

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

"It's the library database!" Ke Shaobin actively answered, "A closed space with a particularly high floor is full of professional books. The system asks us to take the entrance exam and choose a skill book from the book library after passing. Then, everyone I 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 by visual inspection, just like a common lft apartment, surrounded by wooden bookshelves reaching the top."

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

The floor height of 5 meters, the wide hall, and the shining crystal lamp hanging down—is the place where everyone first came to the library 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 of the floors marked by the elevator, but on the hidden mezzanine between the -1st floor and the 1st floor - the 0th floor. "

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

How to get in, how to get out.

This point, they finally figured it out when Xingwen mentioned the experience of being pulled into the library in the first place!