The answer to the brain teaser mentioned in the encyclopedia of cold jokes

In fact, the woman didn't die on the third floor at all, but died after going out. That man won't do it on the third floor because there is a camera. If he wants to do it on the first floor, it is the same as doing it on the third floor. They all work from the outside to the inside and will be photographed by the camera. After the man went out and smiled at her, he took the knife to the third floor and showed it to the woman. In a few seconds from the second floor to the third floor, the normal person's first reaction is to press 1 floor immediately, and then press the door on the third floor immediately (not to mention pressing the alarm and climbing the skylight, no one is superman, let alone a woman, who will not stop pressing the alarm and only answer the elevator administrator's office). In fact, the man doesn't have to walk to the third floor at all, just half or two-thirds of the second floor. When the woman arrives at the third floor, she finds that the elevator has already started, but the man hasn't arrived yet. She will immediately press close to 1 building, and then the man will immediately run downstairs to intercept and kill the woman who ran out of the elevator in 1 building because of fright, which is the cause of her death (the speed of people going downstairs is 1.5).

So what should this woman do? She has only one choice, that is, press the top floor of the elevator at once. On the third floor, she will stand in the corner of the elevator and wait for the elevator to close naturally. At this time, men will not rush in and start work, because starting work here is as effective and meaningless as starting work on the first floor. After that, the elevator door closed and went to the top floor. When a man finds something wrong, he will go to the top floor immediately. At this time, the elevator is faster than people going upstairs. The distance from the third corridor to the top floor is at least 10 floor (elevators must be installed in buildings above 13 floor, which will be understood by those who study architecture), and it takes about 10- 13 seconds. Only during this period, women have the opportunity to ring the alarm bell and call the elevator manager for help. On reaching the top floor, women must immediately throw out their bags and press 10, 7, 5, 3, 1 respectively. When they stop on each floor, they have to throw out their belongings, namely bags, coats, left shoes, right shoes and mobile phones. (Reason: It doesn't help for a man to press the elevator to open the door immediately after finding something wrong, because the elevator won't descend until the top floor. He has only two choices. One is to give up and run out from the first floor immediately, and the other is to continue chasing the top floor. If he catches up with the top floor and finds the bag that the woman threw out, there will be two doubts. One is that the woman ran to the rooftop, and the other is that the woman deliberately threw it out. If he chooses to catch up with the rooftop, the crisis will be resolved. If you continue to follow the elevator down, you will see what the woman threw every three floors, and you will face the same choice, because he really doesn't know whether the woman rushed out of the elevator to run down or still descended in the elevator. Then the probability of his killing a woman is only1/2 *1/2 *1/2 *1/2 =1/64. This probability can't kill people.

PS 1: Ordinary men can be flush with the elevator on the 5th-8th floor, but they can't keep up with the distance between the 8th floors. On the 6th floor+0-3rd floor, they can be flush with the elevator, but they can't keep up with the elevator above the 4th floor. You can try if you don't believe me.

PS2: Elevators must be installed above 13 floor, so the lowest floor on the top floor is also13 floor.

Some questions and answers:

1. The man found something wrong, why didn't he press the elevator? A: He won't start until the elevator comes down because you press it. If you press it, even if you are really fast, let you catch up and let the elevator door open, so what? If you want to kill someone, isn't it under the surveillance of the camera from the outside to the inside? What's the difference between it and the first floor?

2. Why does the roof descent have to stop every 3 floors, every 2 floors, or every 1 floor? Isn't it less likely to throw something to kill you? A: The distance between every three floors is about 5-7 meters. It is possible to run out or stop in the elevator. If you open the door every second floor or every 1 floor, men may see or hear if someone runs out. This is a matter of life and death. You can't take risks, or stop insurance every three floors. If you are not at ease, you can stop every fourth floor or every fifth floor.

Isn't it said that the walking speed of the 5-8 floors is flush with the elevator when the average person goes downstairs? Why can't we stop every three floors without being found? A: If I ask you to run up the 13 floor without rest and then run down, can you still be level with the elevator?

It is possible that the man just ran to the 7-8 floor on the Internet and stopped running, so he pressed the elevator to wait for you to come down. Didn't you meet him when you opened the door when you came down? A: Actually, this is a question of probability, because he doesn't know whether you will go directly to the rooftop. He also wants to bet on the chances that you won't run to the roof. If he is really right and finds that you didn't run to the roof and you are still in the elevator, he still won't do it. Didn't you just call when the elevator went up? That's when it comes in handy. 1 floor, the elevator manager eldest brother will take a wrench to help you clean up the wretched man.

Another result is that the' woman' is dead. What was described above is the' woman', which can be understood as another person's death, so go up. The man's goal is not her = =

I hate captcha.