"Get out of this classroom!"

Wang Yu shouted, and the rest of the people scrambled out of the brightly lit classroom door.

At the moment when the classroom was completely engulfed in darkness, Wang Yu was the last to leave.

As soon as his feet pulled out of the glowing classroom door, the door quickly crumbled black, blending in with the darkness around him.

Wang Yu gasped and calmed his violent heartbeat, it was so dangerous just now, if he was one step late, I am afraid he would not be able to get out.

He turned around to see if the others were okay, but found that he was the only one in this dark space!

Wang Yu's heart suddenly chuckled, and he hurriedly called: "Zihang!" Xu Hao! Where are you? ”

It's a pity that only his own echo keeps coming in the darkness.

"How so? Where have they gone? ”

Wang Yu's heart was very anxious, obviously everyone walked out of this classroom door together, why were they all gone?

His flashlight had landed on his desk in the previous classroom and he hadn't taken it with him when he fled, so he pulled out his phone and turned on the flash to see where he was.

After the light, Wang Yu found himself in a damp corridor at this time, and the walls of the corridor were covered with white tiles, and he couldn't see the end at a glance.

Suddenly, a blinding light lit up in front of the hallway!

Wang Yu immediately closed his eyes and lowered his head, blocking his vision with his hands.

He slowly opened his eyes, and when he had adjusted to the light a little, he raised his head and looked into the bright light ahead.

Two stretched shadows stretched all the way to him.

"Who are the two of them?"

Although Wang Yu was curious, in this case, it was usually curiosity that killed the cat, so he decided to avoid his edge and go backwards instead of provoking these two people.

But the moment he turned around, he was terrified.

At the back end of the corridor, I don't know when stood a few rows of dead students, about fifty people, all with blue faces and white faces, staring at themselves expressionlessly.

Wang Yu was shocked and withdrew his gaze.

Now there is a tiger in front and a wolf in the back.

But there are only two tigers, but there is a group of wolves, so Wang Yu feels that there are still few options.

He walked cautiously towards the front of the hallway.

Gradually, he could see clearly that the bright light was emitted by two doors, the same as the one that had connected the space to the exam room, as if these two doors were the exits from this hallway.

It's just that in front of these two doors, there are a man and a woman, a girl in front of the door on the left, and a boy in the door on the right, both of whom are wearing the uniforms of this school.

The two of them had gloomy faces and were haunted by ghosts.

Wang Yu took it for granted that if he wanted to leave here, he wanted to defeat these two ghost students who were guarding the door.

However, just as he was about to cast a spell to fight the other party, the other party spoke.

The boy said, "These two doors behind us. One is the door of life, and the other is the door of death. Once you have entered the birth gate, you can leave. Enter the door of death, and you will die. ”

The girl said, "You can only ask one question to any of us, and we will only answer yes or no, but one of us will always tell the truth, and the other will always tell lies." ”

"Huh?"

Wang Yu looked at the two of them dumbfounded, this is another test level?

It would be great if you could leave without fighting. After all, he didn't have much confidence against so many ghosts, and even if he won the battle, he would have to choose one of the two doors in the end.

So Wang Yu quickly refined the title of this level and thought about it.

Two doors, one alive and one dead, two gatekeepers, one honest and one lying, can only ask questions to one of the two.

The biggest problem is that this man and woman don't know who is lying and who is honest.

Wang Yu didn't have a clue for a while, and he saw a large number of ghost students behind him, slowly pressing up.

It made them understand that their time was limited.

Time passed minute by minute, and seeing that the group of ghosts behind him was about to arrive, Wang Yu's mind suddenly flashed with inspiration.

"I see!"

Wang Yu immediately asked the girl on the left: "If I ask the boy next to you if the door behind him is a door, how will he answer me?" ”

The girl said, "He'll say no." ”

As soon as Wang Yu heard this, he immediately selected the target, and directly opened the door behind the boy and walked in.

At this time, the sailors in the live broadcast room all sweated for Wang Yu.

It wasn't until they saw that behind the door was not something terrible, but a library, that they were relieved.

The little superman in the underwear: "Brother Yu, how did you do it?" How do you know that the door is the one you can leave? ”

The big boy in red: "Yes, Brother Yu, I didn't understand at all, why did you so quickly determine which one was the real door after you asked the girl that question?" ”

In the face of the curious questions of the sailors, Wang Yu explained: "This is actually very simple, in fact, this question, whether I ask male students or female students, the answer I get must be the opposite of the truth, so female students say that it is not a student, but in fact, it is a student." ”

Let's go: "It's so profound, I still haven't figured out why the answer to that question must be the opposite of the truth?" ”

Physics Department junior student: "You really haven't been to school, isn't it easy to solve such a simple problem with mathematical induction?" ”

Eagle cute girl: "You can talk about the principle!" ”

Physics Department low-level student: "It's too deep, I'm afraid you can't understand this IQ." Just think about it, the question that Brother Yu asked the girl just now was, 'If I ask the boy next to you, is the one behind him Shengmen, what will he answer me'?" ”

Eagle Cute Girl: "So what? ”

Physics Department Junior Student: "First of all, if this girl is a liar, how do you think she will answer?" ”

Eagle cute girl: "If a girl is a liar, then a boy is an honest person." She said that the boy would answer no, but in fact she lied, and the boy would answer yes. Because the boy is an honest person, behind him is Shengmen! ”

Physics Department Junior Talent: "So I understand, the girl's answer to no, is actually the opposite of the truth." ”

Eagle cute girl: "You just assumed that the girl is a liar, so what if the girl is an honest person?" ”

Physics Department low-level student: "If the girl is an honest person, it is still the same answer, I don't believe you can reason again." ”

Eagle cute girl: "If a girl is an honest person, then a boy is a liar." So the girl said that the boy would answer no, but in fact the boy would answer no, because the boy was a liar, so he said that he was not a student behind him, but actually a student! ”

Physics Department Junior Talent: "Now I understand that no matter who is a liar, the final answer is the opposite of the truth. The answer that Brother Yu got was that the boy was not behind the boy, and the truth was that the boy was behind the boy. ”

Eagle cute girl: "I seem to understand a little...... But if Brother Yu was asking a boy at that time, would this still be true? ”

Physics Department of Low Talent Student: "Of course this is true, I don't believe you push it again, and the final conclusion is still the same, if there are two people who are honest and one lies, you ask one of them, and the other person answers a question yes or no?" Then the answer must be the opposite of the real answer to this question. That is to say, if the answer is YES, the truth is NO, and if the answer is NO, the truth is YES. ”

Superman in the underwear: "Wow, this is a law, you must write it down." ”

The big boy in red: "Brother Yu is really amazing, he can solve such a complex problem in such a short time, this logical thinking ability is really admirable." ”

Eagle cute girl: "Yes, Brother Yu is really powerful!" I'll reward him first. ”

Physics Department low-level student: "Obviously I'm also very good, why doesn't anyone praise me?" ”

……

Thanks to his help in explaining, Wang Yu made time to take a closer look at the library.

The library had no windows, only one door, an iron door with a brass lock fastened to it.

There was a book on the table in the center of the room, and Wang Yu walked over to see that it was "Black Tulip"!