How to break into a math book

All five prompts have been obtained, which are: [A is on the left of B; B is the third from the right of C; C is on the right of D; D is next to E; there is a button between E and A. 】

Combining these five pieces of information, it is actually very simple.According to the second and third pieces of information, B is the third on the right of C, and C is on the right of D, which proves that the correct order of BCD should be D, C, B. As for whether there are other buttons in between, it is still unknown. Need to judge again.

On this basis, the fourth piece of information says that D is next to E, which proves that D and E are adjacent, then the order of BCDE should be D, E, C, B or E, D, C, B, There are no other buttons between D and E, and there are probably other buttons between the other three buttons.

Then consider the first message and the last message. A is on the left of B, and there is a button between E and A. Through these two pieces of information, the position of A can be determined.Following the judgment of the previous step, there are two possibilities for adding the position of A to these buttons, namely D, E, C, A, B or E, D, C, A, B.Obviously, the second case does not meet the information [E and A is separated by a button], so the order of the five ABCDE buttons should be D, E, C, A, B.

Finally, judge the position of the button F that is not mentioned in the five pieces of information.First judge the sequence of D, E, C, A, and B according to the description of the five pieces of information.First, A is on the left of B. In this order, A and B are the last two digits, and the first prompt message is completely consistent; In the order of B, it is obvious that there is only one button A between B and C, which means that B is the second on the right of C, which is inconsistent.So it can be determined that the position of the F button is between B and C, that is, two possibilities D, E, C, A, F, B or D, E, C, F, A, B.

Then verify the third and fourth pieces of information. C is on the right of D, and D is next to E. These two pieces of information are consistent in the above two cases, so the last step in determining the position of F lies in the fifth piece of information. .

The fifth prompt says that there is a button between E and A, so for the two cases of D, E, C, A, F, B and D, E, C, F, A, B, obviously the second case is wrong of.

So the correct order should be D, E, C, A, F, B.

The five pieces of information respectively explain the positions of the five buttons of ABCDE, but only the fifth button F is not mentioned.So according to the rules, the fifth button F that is not mentioned is the correct button that can open the gate of the castle.

Tu Hua pressed the fifth button, and the door that was originally tightly closed suddenly popped open with a "click". It was dusty for a long time, and the cracks in the door were still mixed with dust and rust. brought life.

【Ding--】

[Challengers Tu Hua and Wang Boyu will be rewarded with 20 points for the clearance rate of the main task for passing the correct button level. 】

It should be because this level is not threatened by the virus. When clearing the level, the system also specially broadcast the rewards for the clearance rate of the two main missions.

After leaving the checkpoint, Tu Hua quickly opened his system panel, but was taken aback by the number in front of him:

[Current Level: Probability Level]

[Main task: unknown]

[Clear rate: 2/67]

How could it become 67/2?Before going through this level, his clearance rate was 47/20, and the clearance rate of 67 points was obviously rewarded... Tu Hua stared at the number 20 on the denominator, and suddenly realized that the system was adding the [-] points clearance rate to him. On to the denominator!

Seeing this, Wang Boyu quickly opened his system panel. He had experienced this kind of thing before that the clearance rate was getting smaller and smaller. This time he was fully prepared. Before entering the [correct button] level, he passed The rate was 1/64, now it becomes 21/64.

"Mine has actually become taller!" Wang Boyu couldn't believe his eyes and exclaimed, "My 20 has been added to the molecule!"

Tu Hua felt more and more dizzy, obviously passed the same level, why did he and Wang Boyu increase and decrease?Su Gechi stood beside him, frowning, and said after a while: "The original clearance rate setting of this level is to add points to the numerator."

"I suspect that the virus invasion caused the main system to be in disorder, so the clearance rate points are randomly assigned."

Tu Hua couldn't believe it: "That is to say... the more dungeons I do, the lower the clearance rate will be?"

"It's possible, but it's not absolute." Su Gechi said, "It's also possible, like Wang Boyu, to encounter a level where points are added to molecules."

Tu Hua felt that he was going to despair. It took him half a day to clear the level. Instead of bringing him any benefit, it made his clearance rate lower and lower.If he encounters a level where points are added to molecules next time, he will definitely stop immediately and go directly to the main mission, otherwise if he really completes the main mission with a clearance rate of [-]% or even [-]/[-], he will die undoubtedly.

"Are these... all caused by the virus?" Wang Boyu asked suddenly.

Tu Hua nodded: "Yes, I don't know what kind of perverted levels I will encounter in the future."

"Then... can this virus be eliminated?"

Even Su Gechi denied it: "Unless I can leave the game and operate in the terminal, the virus will continue to rage."

Wang Boyu looked very sad: "The person who brought the virus in..."

Tu Hua followed his words and gritted his teeth: "If I catch him, I will definitely beat him hard!"

Wang Boyu frowned, not knowing what he was thinking.

Su Gechi interrupted the anger of the two, and asked, "Are you still planning to continue challenging side missions?"

For Tu Hua, he must have lingering fears, but his current customs clearance rate is too low, and he may not be able to survive directly challenging the main task, so he can only fight to the death.

However, Wang Boyu's 21/64 customs clearance rate is not bad, close to one-third. Sure enough, he gave up the idea of ​​continuing to brush the dungeon: "I will not continue, I will wait for you outside the level, and then we will go to the main line together Task."

After the two parted, Tu Hua planned to take a look around the canteen, which he seldom set foot in.As a result, as soon as he walked downstairs to the cafeteria, he saw an acquaintance.I saw the entrance of a level called "Life and Death" on the flower bed at the entrance of the cafeteria, and Shen Siyi was wandering around the entrance.

Tu Hua was about 100 meters away from him. Just as he was about to call him, he saw Shen Siyi dodge and sneak in from the entrance of the checkpoint.The entrance was not closed after Shen Siyi entered, and it was still shining with a strange light.

This level... seems a bit strange?In the past, side missions were usually set in classrooms, reading rooms and other places. Except for the main mission that needs to be triggered actively during the primary level, Tu Hua has never seen an outdoor level.Most importantly, there is light at the entrance of this level.

The light is very conspicuous, as if there is some treasure inside, tempting the challenger to enter.

Tu Hua was about to go over to have a look, but was suddenly pulled back by Su Gechi.His face was solemn, and his eyes were fixed on the direction of the entrance of the level [Life and Death]: "This level didn't exist originally."

Tu Hua was at a loss: "What do you mean?"

Su Gechi said in a deep voice: "The original game didn't set a level here, nor did it have a side task called [Life and Death], so I suspect... this level is created by the virus program itself."

Tu Hua froze for a moment.After several rounds of dealing, he has long realized how perverted the virus program is. Its purpose is to eliminate all challengers, and the elimination method is very cruel and bloody. He can't wait to stir up conflicts among all challengers and let everyone kill each other .

The level that was adapted by the virus before has become perverted to the point of being unsolvable, and this side mission created by the virus alone is even more unimaginable.

But Shen Siyi went in, and he was alone... I'm afraid it's more than auspicious.

Su Gechi vaguely guessed Tu Hua's thoughts, and analyzed for him: "It is very likely that there is a trap. Your teammate has already made a mistake. I suggest you not take any risks."

Tu Hua hesitated: "But Shen Siyi..."

Shen Siyi is a very good person with potential, Tu Hua thinks that Shen Siyi's ability is much higher than his.But he accidentally entered the trap level of the virus. It would be a pity if he was eliminated like this.

The more excellent people you have, the more likely you are to pass the game.Tu Hua felt that Shen Siyi could not be eliminated no matter from the standpoint of friendship or weighing the pros and cons.

"I want to save him." Tu Hua suddenly raised his head and looked into Su Gechi's eyes, "Shen Siyi is very good, if he can stay, the probability of clearing the game will increase greatly in the future. I know it is not possible at this time Sentimental, but I think the purpose of the virus is to make all our challengers fall apart without fighting, maybe if we face the problem together, the chance of winning will be greater?"

"And we know too little about the virus. He can create a trap level now, and there may be more difficult levels in the future. Knowing ourselves and the enemy is what we have to do. Sooner or later... is to Confronting these viruses head-on."

Tu Hua glanced at the entrance of the trap level, and looked back with calm eyes: "And facing that virus level, we may not necessarily fail."

"Because I not only have the best teammates, but also you."