Analysis of tasks for the exam informatics. Everything you need to know about the exam in computer science

With the modern world of technology and the realities of programming, development USE in Informatics has little in common. There are some basic points, but even if you understand tasks a little, this does not mean that you will eventually become a good developer. But there are a lot of areas where IT specialists are needed. You will not lose at all if you want to have a stable income above the average. In IT, you get it. Provided, of course, that you have the appropriate skills. And you can develop and grow here as much as you like, because the market is so huge that you can’t even imagine! And it is not limited only to our state. Work for any company from anywhere in the world! This is all very inspiring, so let the preparation for the exam in computer science be the first small step, after which years of self-development and improvement in this area will follow.

Structure

Part 1 contains 23 short answer tasks. This part contains tasks with a short answer, implying an independent formulation of a sequence of characters. Tasks check the material of all thematic blocks. 12 tasks belong to the basic level, 10 tasks to an increased level of complexity, 1 task to a high level of complexity.

Part 2 contains 4 tasks, the first of which is of an increased level of complexity, the remaining 3 tasks are of a high level of complexity. The tasks of this part involve writing a detailed answer in an arbitrary form.

3 hours 55 minutes (235 minutes) are allotted to complete the examination paper. It is recommended to take 1.5 hours (90 minutes) to complete the tasks of Part 1. The rest of the time is recommended to be devoted to the tasks of part 2.

Explanations for grading assignments

The performance of each task of part 1 is estimated at 1 point. The task of part 1 is considered completed if the examiner gave the answer corresponding to the code of the correct answer. Completion of the tasks of part 2 is estimated from 0 to 4 points. The answers to the tasks of part 2 are checked and evaluated by experts. The maximum number of points that can be obtained for completing the tasks of part 2 is 12.

Lada Esakova

When a student of grade 11 begins to prepare for the exam in computer science, as a rule, he prepares from scratch. This is one of the differences between the exam in computer science and exams in other subjects.

In mathematics, the knowledge of a high school student is definitely not zero. In Russian, even more so.

But in computer science, the situation is much more complicated. What is studied at school in the classroom has nothing to do with the preparation program for the exam in computer science.

What is the USE in Informatics?

The USE control test in computer science contains 27 tasks, which relate to a variety of topics. These are number systems, this is Boolean algebra, algorithmics, this is programming, modeling, elements of graph theory.

The USE in Informatics covers a very wide range of information. Of course, the exam will only need the basics, but these are the basics of important and modern topics.

Preparing for the Unified State Exam in computer science from scratch implies that the student did not study any of these topics at school. Usually it is!

For example, such a topic as Boolean algebra, or the algebra of logic, is included in the exam in computer science. But it is not studied in schools, even in specialized ones. She is neither in the course of school computer science, nor in the course of mathematics. The student has no idea!

And therefore, almost none of the students solves the famous problem on systems of logical equations. This problem in the Unified State Examination in Informatics is number 23. Let's say more - teachers often recommend that high school students not try to solve this problem at all, and not even look at it, so as not to waste time.

Does this mean that task 23 from the Unified State Examination in Informatics is not solved at all? Of course not! Our students regularly solve it every year. In our course of preparation for the Unified State Examination in Informatics, from many topics, we take only what is required for the exam. And we pay maximum attention to these tasks.

Why does the school not prepare for the exam in computer science?

This is due to the fact that computer science is not a compulsory subject. The Ministry of Education does not provide any standards and programs. Therefore, teachers at computer science lessons give schoolchildren completely different material - who can do what. Moreover, in some schools there are no computer science lessons at all.

What do high school students usually do in computer science classes? Do they play shooting games?

Fortunately, at school, in computer science lessons, schoolchildren are still doing not nonsense, but quite useful things. For example, they study Word and Escel. In life, this will come in handy, but, unfortunately, it is absolutely useless for passing the exam.

Moreover, the guys study Word at a serious level, and some even pass exams in computer layout and receive a certificate of a typesetter. Some schools teach 3D modeling. A lot of schools give web design. This is a wonderful topic, useful in the future, but it has absolutely nothing to do with the exam! And coming to our courses, the student really prepares for the exam in computer science from scratch.

A similar situation is with high school students of specialized lyceums. Strong profile lyceums honestly teach programming in computer science lessons. The guys come out of there as good programmers. But after all, in the USE in computer science, only 5 tasks are somehow related to programming, and of them exactly one task in the USE version is devoted to writing a program! The result is a maximum of 6 tasks for the exam in computer science.

How much time does it take to prepare for the exam in computer science from scratch?

There is good news! You can prepare for the exam in computer science from scratch in one year. It's not easy, but it's possible, and our students prove it every year. The course of preparation for the exam in computer science is not very large. You can take courses once a week for 2 hours. Of course, you need to actively do your homework.

But there is one amendment. If a student has never done programming before grade 11, it is hardly possible to fully master programming in a year. Therefore, task No. 27 of the USE variant in computer science will remain unsolved. She is the most difficult.

It is especially difficult to prepare for the exam in computer science from scratch for those students who have never been familiar with programming at all and do not know what it is. This area is quite specific, so programming training needs to be given a lot of time and solve a huge number of tasks.

In our courses, we make sure to analyze all the typical programming tasks. And not once during the exam did the programming problem come as a surprise to our students - they were all sorted out during the courses. And only task 27 is left out for those who did not do programming at all until the 11th grade.

Coming to our computer science courses, students and parents are sometimes surprised not to see computers in the classroom. They think that since they came to prepare for the exam in computer science, then there should be computers on the tables. But they are not! To what extent is it necessary to have laptops and computers when preparing for the exam in computer science?

This is a feature of the exam in computer science. There will be no computer for the exam! And yes, it will be necessary to solve tasks with a pen on a sheet of paper, because it is in this format that the Unified State Examination in Informatics is now taking place. This is a real problem for those who rent it.

Even high school students from specialized lyceums, who are good at programming, may be helpless at the exam in computer science. They, of course, program on computers, that is, in a special environment. But what happens when there is no computer? And not only schoolchildren - even professional programmers can write a program on paper with great difficulty. Therefore, we are preparing for such a complex format right away. We deliberately do not use computers and laptops when preparing for the Unified State Exam in computer science - according to the rule "It is hard in learning, easy in battle."

For several years now, there have been rumors that the Unified State Exam in computer science will be transferred to a computer form. They promised to do it in 2017, but they didn't. Will they do it in 2018? We don't know yet. If such an exam format is introduced, it will be much easier to prepare for the exam in computer science from scratch.

So, a year of active preparation for the exam in computer science from scratch, and your result is 26 tasks out of 27 possible. And if you are at least a little familiar with programming, then all 27 out of 27. We wish you to achieve such a result in the exam!

And once again I recommend for the preparation of theoretical material and my book "Informatics. Author's course of preparation for the exam " where the practice of problem solving is given.

Tell your friends!

This exam lasts 4 hours. Maximum amount points scored - 35. The percentage ratio between the levels of questions is almost equal. Most of the questions are test questions, in the exam only 4 tasks are assigned for a detailed answer.

Computer science exam is quite complex and requires special attention and proper preparation of students. It includes general test questions which are designed for low level knowledge. There are also tasks that require reflection and calculations with an accurate calculation.

The distribution of tasks in parts of the exam paper of the Unified State Examination of 2019 in computer science, indicating the primary scores below in the infographic.

Maximum points - 35 (100%)

Total exam time - 235 minutes

66%

Part 1

23 tasks 1-23
(with short answer)

34%

Part 2

4 tasks 1-4
(Detailed response)

Changes in KIM USE 2019 compared to 2018

There are no changes in the CIM structure. In task 25, the possibility of writing an algorithm in natural language was removed due to the lack of demand for this possibility by the exam participants.
Examples of program texts and their fragments in the conditions of tasks 8, 11, 19, 20, 21, 24, 25 in the C language are replaced with examples in the C ++ language, as it is much more relevant and common.

Systematic preparation is the key to success

The educational portal site offers many demonstration computer science tests that you can solve without leaving your workplace.

Trial tasks will help you plunge into the atmosphere of testing and find those knowledge gaps that need to be corrected to achieve maximum results.

The unified state exam in informatics consists of 27 tasks. Each task is devoted to one of the topics studied in the framework of the school curriculum. Computer science is a core subject, so only those students who need it in the future take it. Here you can learn how to solve USE tasks in computer science, as well as study examples and solutions based on detailed tasks.

All USE tasks all tasks (107) USE task 1 (19) USE task 3 (2) USE task 4 (11) USE task 5 (10) USE task 6 (7) USE task 7 (3) USE task 9 (5) USE task 10 (7) USE task 11 (1) USE task 12 (3) USE task 13 (7) USE task 16 (19) USE task 17 (4) USE without number (9)

The Quadrator performer has two commands: add 3 and square

The performer Quadrator has two teams, which are assigned numbers: 1 - add 3; 2 - square it. The first of them increases the number on the screen by 3, the second raises it to the second power. The performer works only with natural numbers. Write an algorithm for obtaining number B from number A, containing no more than K commands. In the answer, write down only the numbers of the commands. If there is more than one such algorithm, write down any of them.

Vasya makes up words in which only letters occur

Vasya makes up N-letter words in which only letters A, B, C occur, and the letter A appears exactly 1 time. Each of the other valid letters can occur any number of times in the word, or not at all. A word is any valid sequence of letters, not necessarily meaningful. How many words are there that Vasya can write?

Igor makes a table of code words for message transmission

Igor makes a table of code words for message transmission, each message has its own code word. Igor uses N-letter words as code words, in which there are only letters A, B, C, and the letter A appears exactly 1 time. Each of the other valid letters may occur any number of times in the codeword, or not at all. How many different code words can Igor use?

The task is included in the exam in computer science for grade 11 at number 10.

Algorithm for calculating the value of the function F(n)

The algorithm for calculating the value of the function F(n), where n is a natural number, is given by the following relations. What is the value of the function F(K)? Write down only a natural number in your answer.

The task is included in the exam in computer science for grade 11 at number 11.

How many seconds does it take for a modem to send messages

How many seconds does it take for a modem transmitting messages at a rate of N bps to transmit a color bitmap of size AxB pixels, provided that the color of each pixel is encoded in K bits? (Enter only the number on the form.)

The task is included in the exam in computer science for grade 11 at number 9.

The decryptor needs to recover the corrupted message fragment

The decryptor needs to restore the damaged fragment of the message, consisting of 4 characters. There is reliable information that no more than five letters were used (A, B, C, D, E), and one of the symbols is in the third place... One of the letters is in the fourth place... One of the letters is in the first place ... On the second - ... Additional information appeared that one of the four options is possible. Which?

The task is included in the exam in computer science for grade 11 at number 6.

The meteorological station monitors air humidity

The meteorological station monitors air humidity. The result of one measurement is an integer from 0 to 100 percent, which is written using the smallest possible number of bits. The station made N measurements. Determine the information volume of the observation results.

What will the formula look like after the cell is copied

The cell contains a formula. What will the formula look like when cell X is copied into cell Y? Note: The $ sign is used to denote absolute addressing.

The task is included in the exam in computer science for grade 11 at number 7.

Being in the root directory of a newly formatted drive

Being in the root directory of the newly formatted disk, the student created K directories. Then, in each of the created directories, he created another N directories. How many directories were on the disk, including the root?

The task is included in the exam in computer science for grade 11.

Four pieces of paper were found at the crime scene.

Four pieces of paper were found at the crime scene. The investigation found that fragments of one IP address were recorded on them. The forensics labeled these fragments as A, B, C, and D. Retrieve the IP address. In your response, provide a sequence of letters representing the fragments, in the order corresponding to the IP address.

Petya wrote down the IP address of the school server on a piece of paper

Petya wrote down the school server's IP address on a piece of paper and put it in his jacket pocket. Petya's mother accidentally washed the jacket along with the note. After washing, Petya found four scraps with fragments of the IP address in his pocket. These fragments are labeled A, B, C, and D. Restore the IP address. In your response, provide a sequence of letters representing the fragments, in the order corresponding to the IP address.

The task is included in the exam in computer science for grade 11 at number 12.

When registering in a computer system, each user is given a password.

When registering in a computer system, each user is given a password consisting of 15 characters and containing numbers and capital letters. Thus, K different characters are used. Each such password in a computer system is written in the minimum possible and the same integer number of bytes (in this case, character-by-character encoding is used and all characters are encoded in the same and minimum possible number of bits). Determine the amount of memory allocated by this system for storing N passwords.

The task is included in the exam in computer science for grade 11 at number 13.

In some country, the car number is made up of capital letters

In some country, a car number of length K characters is made up of capital letters (M different letters are used) and any decimal digits. Letters with numbers can follow in any order. Each such number in a computer program is written in the minimum possible and the same integer number of bytes (in this case, character-by-character coding is used and all characters are encoded in the same and minimum possible number of bits). Determine the amount of memory allocated by this program for writing N numbers.

The task is included in the exam in computer science for grade 11 at number 13.