Microsoft Research Institute interview questions. See if you are smart.

In the morning, there was a traffic jam. I used my cell phone to read Lee Kai-fu's blog article. He said that during the interview with Microsoft Research Institute, he mainly asked several questions: first, whether you are smart, whether you can integrate into the team, and how you are qualified.

The questions include:
1. "Why is the manhole cover circular ?"
2. "estimate the number of gas stations in Beijing ".

The answer is as follows:

1. Because the well is circular, the manhole cover is circular. Why is the well circular? Because it is necessary to facilitate the entry and exit of workers, circular materials are saved and the most robust.
I have seen square manhole covers, but it seems that there is no square manhole covers that can still be used. Some small circular manhole covers may be caused by mold or damage.

2. if the car is able to drive 50 kilometers after the alarm is cleared of oil, you only need to make sure it is no more than 50 kilometers away from the gas station at any point. All gas stations are arranged according to the hexagonal structure of the honeycomb. The distance from the hexagonal center point to the fixed point is 50 kilometers.

The Beijing Road is basically portrait, so the distance between the two points cannot be reached, and you can just turn a right angle. In this way, a certain number of gas stations need to be added.

The actual road actually only needs to know the total length of the road and divide it by 50 kilometers to get the number of gas stations.

 

Question 1 answered by Richard Van Mann, a real cool man, is displayed on the Internet:

Interviewer: Now let's ask you a question and look at your creative thinking abilities. Do not think too much, use daily

Common sense in life: Describe your thoughts. The question is, why is the manhole cover of the sewer circular?

Van Mann: they are not all round. Some are square. There are indeed some manhole covers, but I have also seen Square covers, long Square covers.

Interviewer: But we only consider circular manhole covers. Why are they round?

Fan man: if we only consider the circle, they are actually round.

Interviewer: I mean, why is there a circular manhole cover? What is the special significance of designing a manhole cover into a circular shape?

Fan man: it has special significance. When the holes to be covered are circular, the lid is usually circular. Use a Circular

It is the easiest way to cover a circular hole.

Interviewer: can you think of the advantages of a circular manhole cover over a square manhole cover?

Van Man: Before answering this question, let's take a look at what is under the lid. The holes in the lid are circular,

Because the cylindrical shape is most able to withstand the pressure on the surrounding land. In addition, the entrance and exit of the sewer means to leave enough people to pass through.

While the cross section of a person who climbs down a ladder is basically circle. So the circle naturally becomes the launch

Shows the shape of the input hole. The circular manhole cover only covers the circular holes.

Interviewer: Do you think there are security considerations? I mean, will the square manhole cover fall?

Does this cause personal injury?

Fan man: unlikely. Sometimes you can see a square lid on some square holes. This lid is larger than the entrance,

There is a horizontal margin around. The lid is usually metallic and very heavy. We can imagine that the square hole is 2 feet wide.

Mouth, ranging from 1 to 1.5 inch wide. In order to let the manhole cover fall in, you need to raise one end and then rotate for 30 degrees, so that it will

Without being blocked by the horizontal archive, and then the manhole cover and the horizon into a 45 degree angle, then the transfer of the center of gravity is enough to let the manhole cover down

Go. Yes, the manhole cover may fall down, but the possibility is very small. As long as the person in charge of manhole cover is trained a little

Training, he will not make such a mistake. From an engineering point of view, the shape of the manhole cover is entirely dependent on the hole to be covered.

Port shape.

Interviewer (difficult): Excuse me. I want to discuss something with the management. (Left the room)

(10 minutes later, the interviewer will return .)

Interviewer: We recommend that you work in the sales department immediately.

 

In fact, Richard Van Mann did not answer the question correctly, but he could justify it and make people think it makes sense. This is also a capability.

Question 2: I have not found an answer yet. Who knows.