Chapter 51 The end of the preliminaries
Qiao Yu didn't want to get a good result in the preliminaries. He would be satisfied as long as he passed the line, because according to the rules of the competition, the preliminaries results had nothing to do with the final results.
But when the time came and after opening the question bank, Qiao Yu smiled.
For example, the first question belongs to the category of combinatorial geometry. One question tests plane geometry, combinatorial mathematics, visibility diagrams, etc. The question mentioned the problem of line of sight obstruction, which is a metaphor for Qiao's understanding of mathematics. This kind of problem usually appears in computational geometry.
But this is a multiple choice question.
It's not like Qiao Yu is bragging. What he is best at is multiple-choice questions.
He didn't even need to draw a picture, just by clicking on the pre-arrangement and visibility questions, he deduced that the number of people could not exceed 6, and eliminated answer D.
In addition, the two towers E and F are not in sight. Next, you only need to draw a picture in your mind according to the conditions.
The final answer was exactly six people.
It took ten minutes and he felt very good. Qiao Yu looked at the second question, which was composed of two multiple-choice questions.
Coincidentally, this question examines probability theory and expected value.
It happens to be a field that he is familiar with. The mathematical idea that needs to be used in the first question is probably the memorylessness of exponential distribution. In layman's terms, the probability of an event occurring in the future has nothing to do with the past.
In short, I have learned it, it is simple.
At the third question, Qiao Yu finally felt that it was starting to become more difficult.
However, this question tests the contents of algebraic number theory and geometric number theory, combining eigenvalues and number theory. Qiao Yu finally understood the meaning of open-book exams. Discussing the density of grid points in the plane, he had some vague impressions in his mind, but he was not sure.
So Qiao Yu started searching the Internet according to the prompts at the bottom of the question, and soon found the famous Minkovsky theorem. Then he started looking for various explanations of geometric number theory on video websites, annotated them, and collected them directly.
However, Qiao Yu did not watch those videos for the time being. Instead, he gave up the third question and began to study the following questions.
It’s just the preliminaries, as long as you make it to the finals, it’s enough. According to the situation in previous years, you don’t need to complete all the test questions.
In this way, Qiao Yu sat in front of the computer answering questions throughout Saturday except when Qiao Xi called him to eat.
Xia Keke came to see Qiao Yu once in the evening as usual, but after learning that Qiao Yu was participating in an online mathematics competition, she did not knock on the door to disturb him.
There were seven questions in total. When Qiao Yu felt dizzy and went to wash up and go to bed, he had answered three questions completely. Questions one, two, and question four.
The fourth question is about linear algebra and abstract algebra. It mainly tests the analysis of eigenvalue decomposition and eigenspace structure. This area of Qiao Yuqiang was terrible. Similar preliminary questions could not stump him at all, not to mention that during this period he had intensively studied a lot of algebra and number theory.
For the other four questions, Qiao Yu was not sure, or only had a rough idea, so he decided to wait until the next day to watch the video and answer two selective questions.
Based on the experience shared by the finalists in previous preliminaries on the forum, basically as long as you have the confidence to answer four questions correctly, you will basically get a ticket to the finals.
Of course, for safety reasons, Qiao Yu decided to answer at least three to four questions tomorrow. You don’t have to be completely correct, but you should be able to get some points if you convey the general idea.
In addition, the reason why I am not in a hurry to do it today is that any operation online will leave traces.
Especially if you are using someone else’s backend and doing a few questions a day, it will be easier to lose sight of everyone. There is no money given in the preliminaries, so there is no need to show anything special. After all, he is only fifteen years old, and there are almost no barriers to entry in the Alibaba Mathematics Competition. This means that as long as the heart is strong enough and not afraid of embarrassment, mathematics professors from top universities and even Fields Medal winners can sign up.
And he is just a little Karami who is just over fifteen years old.
If someone notices you because of your good performance, you might be put under the spotlight.
Qiao Yu didn't mind being famous or not, but according to this year's competition schedule, the results will be announced at the end of June, allowing the players to make some preparations, and then the finals will begin in early July. During this period of time, people were staring at me and talking about me, and I had no money to take. I was just looking for trouble for myself.
To put it bluntly, the focus is still on the finals.
Qiao Yu climbed out of bed at six o'clock the next morning. I started watching the videos I marked online yesterday and spent the whole morning studying. Qiao Xi would bring him meals to his room.
Qiao Yu didn't start answering questions again until two o'clock in the afternoon. At eleven o'clock in the evening, nine hours before the end of the competition, all the questions were solved.
It could have been earlier, but Xiaolibaba’s online question-answering system is not that easy to use,
After overcoming this small difficulty, Qiao Yu is still very confident about reaching the finals.
......
Monday is the Dragon Boat Festival, a day off, but Lan Jie still got up early in the morning, turned on the computer at eight o'clock on time, and started to pay attention to the question bank of the Little Li Baba World Mathematics Competition.
According to the practice of previous years, whether it is the preliminaries or the finals, Little Libaba will simultaneously publish the questions and answers in the historical question bank on the official website after the competition.
Although Teacher Olympiad does not need to study such competition topics, and he has not signed up to participate in the competition, because the topics of the Little Libaba Mathematics Competition are very interesting, Lang Jie pays attention to them every year.
People who have no interest in mathematics at all may find it difficult to understand the feeling of relief after solving a difficult problem. Not to mention that Qiao Yu may also have signed up to participate in this year's event. Lang Jie has always been curious about Qiao Yu's mathematics level.
By combining the difficulty of the questions and Qiao Yu’s score at the end, you can probably have an idea.
This year's preliminaries were arranged well. After the exam, it happened to be the Dragon Boat Festival break. He, an older single man with few other hobbies, could use it to study the test questions.
After reading it once, Lan Jie had a rough judgment in his mind. The difficulty was basically the same as in previous years, and it was probably at an intermediate or high level in the mathematics world. The scope of coverage is also very wide, involving many fields such as algebra, geometry, number theory, combinatorial mathematics, and probability.
This question setting mode is more friendly to contestants who come from mathematics majors. After all, these contestants have more systematic learning experience. It is indeed more difficult for non-professional players.
Especially the last question not only involves the modeling and solving of differential equations, but also includes dynamic system analysis and the understanding and reasoning of periodic motion. It would have taken him a whole day to answer this question, and he might not be able to get it right.
As for Qiao Yu's words...
When the image of this child appeared in his mind, and when he thought of his pious attitude when he asked whether the bonus needed to be tax deducted, Lan Jie was really not sure that this kid could Cannot pass the preliminaries.
Unfortunately, we have a day off today, and the afternoon Olympiad class has naturally been cancelled.
However, Lang Jie's uncontrollable curiosity still made him pick up his phone and click on WeChat.
Thanks to book friends, Feng Chen Yun 1 for the reward
(End of this chapter)