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Quick answers for submitting code, reading verdicts, and joining contests. Can't find it? The discussion board and maintainers are one click away.
Open any problem, pick your language, paste your code, and hit submit. The verdict streams back in milliseconds.
Each test case shows a status, runtime, and memory. Click a submission to see per-test detail.
Browse live and upcoming contests, register, and solve under ACM or OI scoring rules.
Open a problem from ~/problems, choose a language in the editor, paste or type your code, and click submit. Your code is queued on the nearest judger and the verdict appears live as each test runs.
The full, always up-to-date list is shown in the language selector on the submit panel. Each language has its own compiler flags and time-limit multiplier.
You can browse problem statements without an account, but you need to register to submit code, join contests, and appear on leaderboards.
See the verdict legend above. AC means every test passed; WA, TLE, MLE, RE and CE each point to a specific failure mode so you know where to look.
Your program exceeded the time limit on at least one test. Profile your algorithm's complexity, avoid slow I/O, and check the per-test timing on the submission detail page to find the slow case.
For practice problems, the submission detail page shows the first failing test number, runtime, and memory. Hidden test inputs themselves are not revealed.
Submissions are distributed across a judger cluster via ActiveMQ, with a median round-trip latency around 11ms. Heavy contest traffic may add a short queue.
ACM ranks by problems solved with penalty time per wrong attempt. OI awards partial points per passed test group, so a partially correct solution still scores. Each contest states its mode on the detail page.
Yes — problems move to the practice archive once a contest closes, so you can keep solving them. Those submissions do not affect the final standings.
Use the "forgot password" link on the login page. A reset link is sent to your registered email; if it doesn't arrive, check spam or contact help@verwandlung.org.
Usernames are tied to your submission history and leaderboard entries, so changes are limited. Email support if you have a genuine need to rename.