Dididi......

The sound of water droplets is still calm, but Zhao Feng's breath is no longer on par with it.

"How many forks in the road are these?"

Zhao Feng inhaled hard, and the deeper he went, the thinner the air in the cave became, and he couldn't maintain his normal breath for a long time.

Moreover, after passing through twenty forks, Zhao Feng obviously sensed that something was wrong with this cave, so he turned around and went back the way he came.

All the roads encountered on this road are three forks, and they all choose the forks on the left, so there is no need to recall when returning, Zhi Zhao Feng because he feels bad, and he runs directly against the right wall in a hurry, anyway, the road will not be wrong, and it will eventually lead to the exit.

Because of this, Zhao Feng did not count the forks, so that when he returned to the first fork, because the original intersection disappeared, he groped his way into the right hand side of the first fork......

Zhao Feng, who had been running for nearly ten minutes, once again realized that the situation was wrong, and after he walked out of a passage, he stopped, turned around and used the light of his mobile phone to illuminate the surroundings.

"I've definitely passed through at least twenty forks in the road, and normally I'm supposed to have walked out of the cave, and my hand hasn't left the wall all the way, so it's impossible for it to slip...... This cave is greasy...... "Zhao Feng's breath was constantly aggravated by the environment and the fear in his heart, and he looked at the battery level of his mobile phone, and there was still 73%, if he only used the flashlight function, he didn't have to worry about it in a short time.

"I'm stuck here...... There is no doubt about that...... Don't panic, the more fearful you are, the more you will make wrong judgments...... Before you completely calm down, you can't take any action......" Zhao Feng simply sat down cross-legged, his brain was empty, and he gave up all thinking in a short period of time, thinking will accelerate the oxygen consumption of the brain, which is not conducive to calmness.

Under the influence of the blood, the blood was calm, the heartbeat slowed down, Zhao Feng's breath gradually returned to normal, and even the usual breath was longer and calmer, all negative emotions were temporarily suppressed, and the brain began to think about countermeasures.

"Regardless of the principle of this cave, there are currently three possible scenarios, one is that the cave itself is a 'death loop', the purpose is to trap all intruders in it, no matter how you choose, the three forks will fall into an infinite death loop, if this is possible, then the actual size of this cave may be smaller than I imagined, maybe with a similar formation or something, let me go back and forth in a fixed number of forks. Zhao Feng got up, took out the dagger he was carrying, pressed it against the wall, and slowly walked forward, still choosing to stick to the right road.

After traveling through the seventeen forks, Zhao Feng wrote down the number of forks, then turned around, returned along the left fork, and illuminated the marks on the wall with a light.

Seventeen forks returned to their place, and the marks on the walls did not disappear.

"Well, this can probably rule out the possibility of a death loop, the traces of progress do not coincide with the traces of the starting point, and the traces have not disappeared, at least the wall of these seventeen forks is fixed, of course, it is not ruled out that the scale of the cave is larger than I imagined, but this cannot be confirmed in a short period of time, so I can only leave it behind for verification. ”

Zhao Feng put the dagger against the wall again, continued to move along the left fork, and continued to analyze: "The second possibility is that there are one or more correct paths in this cave, and only through the correct fork can you leave or enter the core area of the cave. ”

"Unfortunately, because of my previous mistakes, I can't remember which one was the first fork in the cave, but if I have enough time, any fork can be used as a starting point to eliminate the wrong route one by one, but it's too much work, and the battery of my phone can't be maintained until I find the right route, and my body can't keep going like this. ”

Zhao Feng walked out of another passage, and then used the dagger's marks on the wall to add two marks, up and down, so that it turned into an arrow pointing forward, and then he returned the same way, retreated to the previous fork, and then left a clipper head pointing to the middle fork on the wall between the left fork and the middle fork, and then walked into the middle fork.

"There are two possibilities at the end of the fork...... No...... I can't waste my brain power on this kind of thing that will know the outcome quickly, there is no point in analyzing this kind of thing......" Zhao Feng gritted his teeth and forced himself to empty his brain again, until he walked out of the first middle fork, he came back to his senses for the first time, and looked at the wall on the left hand side: there were traces of arrows pointing to the left fork on the wall!

"Whew...... That's great. Zhao Feng exhaled, not that the situation had improved, but that the "truth" of this cave had finally been revealed.

"Now it can be determined that the left fork and the middle fork of the previous fork lead to the same end point, but it is not possible to make a valid conclusion......" Zhao Feng immediately turned around and returned the same way, during which he also checked the wall of the middle fork, and there were no traces left by daggers on the wall, which means that although the end points of the left fork and the middle fork are the same, the passages are independent.

Walking out of the passage, Zhao Feng left an arrow pointing to the right fork on the wall between the middle fork and the right fork, and then walked into the right fork-

At the end of the passage, sure enough, there were still three forks, Zhao Feng turned his head to look at the left-hand side, there was no trace of the wall under the light, for the sake of caution, he also looked at the wall on the right-hand side, which was also traceless.

Zhao Feng is very satisfied with this result, if the end of the right fork can also see the traces, it means that the three forks are completely connected, then there is an unsolvable loop, and now we know that there is a fork can lead to another road, as long as the same method continues to find the right passage from the three forks, and finally can get out.

Now Zhao Feng can be said to have mastered the solution to this cave problem, and the next step is to find the right way through a lot of practice!

Zhao Feng still took the left fork as the starting point, tried one by one, and left an arrow pointing to the correct road through the two walls between the three forks, and the original intention was also to hope that if someone broke into this cave by mistake in the future, he could find the right path according to the arrow he left.

Practice proves that what is required is physical strength, after all, it is necessary to run back and forth between the three forks, and as time goes on, more and more evidence proves that only one of the three forks is indeed incompatible with the other two.

Zhao Feng became more and more convinced that his ideas were correct, and it was this belief that made him see hope, and he showed stronger endurance than usual for a while......

"Can't stop! Maybe there's light at the next fork!"

Uphold the obsession and move forward!

Zhao Feng rushed out of a right fork, but the scene in front of him made him almost desperate: on the two walls between the three forks, there were two arrows pointing to the middle fork......