A domain is an isolated space, typically one per institution. It holds its own problems, assignments, contests, trainings, discussions, members, and roles.

Whether a domain is public or private is controlled by its roles and their permissions.

The default domain is system. Visiting MyCode without a domain path opens it, and the logo always links back to it.

Data in one domain is not visible from another unless an administrator explicitly shares it.

MyCode judges submissions in an isolated sandbox. The compiler versions and compile options for each language are listed on the status page.

Time usage is measured as the CPU time of your process. The limit is the one set for each test case of the problem.

Memory usage is measured as the peak memory of your process. The default limit is 256 MiB unless the problem states otherwise.

Unless the problem states otherwise, read from standard input and write to standard output.

• Waiting Queued: waiting for a judge worker to pick it up.
• Fetched In progress: a judge worker has taken the submission and is preparing.
• Compiling In progress: compiling.
• Judging In progress: compiled successfully, running test cases.
• Accepted Passed: output is correct.
• Wrong Answer Failed: output differs from the expected answer (trailing spaces and trailing blank lines are ignored).
• Time Limit Exceeded Failed: the program ran longer than the time limit.
• Memory Limit Exceeded Failed: the program used more memory than the limit.
• Output Limit Exceeded Failed: the program produced too much output.
• Runtime Error Failed: the program crashed (for example out-of-bounds access, division by zero, stack overflow, invalid pointer) or exited with a non-zero code.
• Compile Error Failed: compilation failed.
• System Error Error: an internal judging error. Please report it to your administrator.
• Canceled Other: judging was canceled.
• Unknown Error Other: unknown error.
• Ignored Other: ignored.

A record marked as cancelled was manually voided by an administrator, for example because it broke academic-integrity rules.

Common causes:

• 1. The wrong language was selected when submitting.
• 2. In Java, the public class is not named Main.
• 3. C/C++ specific issues (see below).
• 4. Ordinary syntax or type errors.

Notes for C/C++:

• 1. Use long long instead of __int64 with GNU C++.
• 2. main() must return int, not void.
• 3. A loop variable declared as for (int i = 0; ...) is not visible after the loop.
• 4. itoa is not a standard C/C++ function.
• 5. Use %f, not %lf, to print a double with printf in strict C89.

Trainings are curated learning paths of problems. Open "Training" in the navigation bar to start one.

The accepted ratio is the share of submissions to a problem that were accepted. It is only a rough guide to difficulty.

Rating points (RP) are earned by solving problems and taking part in contests and other activities.

Problem difficulty in MyCode is calculated from the number of submissions, the acceptance rate, and the time and result of each submission.

Keep in mind:

• 0. A higher number means a harder problem.
• 1. Difficulty for new problems is unreliable until they have many submissions.
• 2. Earlier submissions influence the difficulty more than later ones.
• 3. The value is computed automatically and may be inaccurate.

Test data is uploaded as files on the problem's Files page, with an optional config.yaml describing subtasks, scores, limits, and checkers. See the Faculty Manual for the full format.

If you cannot log in, first check that you are using the right username. It may differ from the one you intended if that name was already taken.

If you have forgotten your username or password, or think your account is compromised, Reset Password or Find Username right away.

Text areas in MyCode use CommonMark with these extensions:

• Math formulas in KaTeX syntax.
• Mention a user with @[](/user/uid).
• Highlight text with ==text==.
• Set an embedded image's size with ![alt](url =100x100).
• Embed a video file with @[video](https://.../a.mp4).
• Embed a YouTube video with @[youtube](VIDEO_ID).
• Embed a PDF with @[pdf](https://.../a.pdf).
• In problems, contests, assignments, and trainings, link an attachment with file://filename (recommended).
• A safe subset of HTML tags.