---
metadata:
  - name: generator
    content: Diplodoc Platform v5.48.2
alternate:
  - https://admin.contest.yandex.ru/docs/en/examples/programming.md
  - https://admin.contest.yandex.ru/docs/ru/examples/programming.md
---
> **Documentation Index:** Fetch the complete configuration index at https://admin.contest.yandex.ru/docs/en/llms.txt

# Create a programming problem

In Yandex Contest, you can create a problem where participants provide a code in a programming language that performs calculations according to the problem statement.

Programming problems are different from the simpler problems:
- A participant's code runs in an isolated virtual environment with specific characteristics.
- The code is called with a specific version of the compiler or interpreter.
- A predefined data stream, usually an **stdin** stream, is fed as input.
- A specific data stream, usually an **stdout** stream, is expected as output.

Running a program consumes CPU time and a certain amount of memory, which Yandex Contest measures and may limit. This is especially important for optimal solution problems.

To create a problem like this, you don't need any programming experience. A problem like this can be universal for multiple programming languages.

> **Example**
> 
> Implement a program that sums up several integers fed into the standard input stream.

## 1. Create a problem {#create-task}

1. Go to [Problems](https://admin.contest.yandex.ru/problems/) and click **Create problem**.
2. Enter a name and click **Create**. The name will be displayed in the participant interface.
3. Enter a short name. You can also add the name in English.
4. In the **Problem type** field, select `PROBLEM_WITH_CHECKER`.

## 2. Specify the answer type {#answer-type}

Select one of the following types:
- **Text or file**: The solution can be entered in a multi-line text input field or submitted as a file with the answer program code.
- **Text**: The solution must be entered in a multi-line input field.
- **File**: The solution must be submitted as a file.
- **Single text line**: The solution must be entered in one line in the input field (not applicable for some programming languages).

## 3. Add a problem statement {#add-condition}

1. Select **Statements** on the left.
2. Select the **TeX** statement type.
3. Select a language: **ru** for Russian or **en** for English.
4. On the right, click **Add statement**.
5. Click the row with the added statement, for example: `Russian (tex)`.
6. Enter the statement in the form and click **Save**.

For more information on creating problem statements, see [Statements](https://admin.contest.yandex.ru/docs/en/problem/statements.md).

## 4. Add tests {#add-test}

**Tests** are sets of input data and the expected results of executing a program. For example:

```
Problem: Write a program that sums up multiple integers fed into the standard input stream.

Input data:
5 7
Expected result:
12
```

Tests are the main element of programming problems. There are several ways to create test files:

- Create tests one by one using the admin panel in the browser.
- Create tests on a computer and then upload the archive with the test files to the problem.


{% list tabs %}

- Creating test files via the admins panel

  
  1\. In the section on the left, select **Tests and solutions** and click **Create a test**.

  2\. In the **Name of test file** field, specify a name for the input data file, for example: `01`.
  
  3\. In the **Test data** field, specify the input data, for example: `5 7`.

  4\. In the **Name of response file** field, specify a name for the file with the expected result, for example: `01.a`.

  5\. In the **Answer** field, specify the expected result, for example: `12`.

  6\. Click **Add**.
  
  After you fill out the form, it should look like the screenshot below:
  
  ![](../_images/examples/programming/test_create_example_filled.png)
  
  
  {% note info %}
  
  You can specify any names for the test and answer files, but we recommend using two-digit numbering and the extension `.a` for the answer file. This way, you'll need fewer actions when creating test sets.
  
  {% endnote %}

- Uploading test files as an archive

  1\. Create all test files on your computer.
      
    Input data file names should be similar to each other and slightly different from the files with expected results. For example, `01 02 03` for files with input data and `01.a 02.a 03.a` for files with expected results.
      
  2\. Move the test files to the directory. By default, it's **tests**.

  3\. Archive the folder.

    - Acceptable archives formats are: 7-Zip, ZIP, RAR, tar, tar.gz.
    - The archive's root folder must contain the **tests** directory, which contains data files.
      
  4\. Select **Downloaded files** on the left.

  5\. Select the problem files' root and click **Select file**.
  
  The files will be downloaded and unpacked. If file names and paths match, the files will be replaced.

{% endlist %}

## 5. Create and update test sets {#add-test-set}

A **test set** is a way to test participant solutions by groups rather than all together. Each group checks specific extreme cases in participant solutions.

By default, a problem has an **All tests** test set, but you can also add tests to the **samples** set and an unlimited number of individual sets.

**Samples** are test sets that participants see in a statement as an example of input data and expected results.

1. In the section on the left, select **Tests and solutions**.
2. At the bottom of the page, find the **Test sets** section and click the line **All tests**.
3. In the **Input file pattern** field, specify the path to the test files and test numbers in brackets, for example: `tests/{01-04}` to add tests one to four and `tests/{05-}` to add test five and all subsequent tests.
4. In the **Correct answer file template** field, specify the extension for the answer files, for example: `*.a` to add all files with names that match the test names from step 3 and have the extension `.a`.
5. Click **Update tests**.

  ![](../_images/examples/programming/add_tests_to_test_set.png =700x)

## 6. Make sure the problem works correctly (optional). {#check-code}

To make sure the program works correctly, you need a solution in any supported programming language.

To submit a solution:

1. In the section on the left, select **Tests and solutions** and click **Add solution**.
2. Select the file with the solution source code in any supported programming language or upload it by clicking **Select file** and finding the desired file on your computer.
3. In **Solutions**, click your solution and select the compiler that is suitable for running the solution.
4. Click **Submit**.

There are different ways to view detailed reports of submission testing:

- In the **Submissions** section, click the desired submission's ID.
- Alternatively, you can click **Rejudge** to rejudge the submission.

![](../_images/examples/programming/submissions.png)

{% note info %}

When rejudging, a new environment is created for the submission based on the problem's current settings. If a submission was sent when there was only one test, and later another test was added, the submission will undergo two tests.

{% endnote %}

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