Try your own cases
Not sure it works? Type your own inputs and press Run first.
Wrong answer?Now you’ll know why.
Practice hundreds of coding problems. When your solution fails, a friendly tutor shows you where it went wrong, in plain words.
Run your solutions in
Stuck? Get a nudge, not a spoiler.
Ask the way you’d ask a friend. The tutor has already read your code and your failed result, so you get a real answer, not a lecture.
Never stuck alone
It’s there the moment a submission fails, day or night.
Plain words, not jargon
It explains the mistake the way a friend would, and points to the line to look at.
Already on your page
It has seen your code and your result. Just ask, even half a question.
A nudge, not the answer
Start with a small hint and ask for more if you need it. The fixing stays yours.
Try it. Break it. Fix it.
Test your own ideas before you submit, see exactly what went wrong, and look back at how far you’ve come.
See what went wrong
Your answer next to the right one, for the exact case that failed.
Look back at every attempt
Every wrong answer is saved, so you can watch yourself get closer to Accepted.
Creating problems
Make a problem without the busywork.
Chat with the assistant about what to cover. It suggests the tricky cases, your own solution works out the answers, and nothing is graded until you approve it.
1 · You
Ask
Pick a suggestion like “1 edge, 1 normal”, or type what you want covered.
2 · Assistant
Draft
It suggests cases, each named by what it tests. Nothing you already have.
3 · Your solution
Run
Answers come from your own solution, never from the AI.
4 · You
Approve
Only the cases you accept are saved and used for grading.
Nothing counts until you say so.
New cases start as drafts. If one breaks your solution, it is flagged for you to check instead of quietly slipping into grading.
Spend your time on the problem, not the typing.
By hand
- Think up tricky inputs that catch wrong solutions
- Type each one in, parameter by parameter
- Work out every answer yourself
- Re-read the list for repeats and gaps
With the assistant
- Pick a suggestion
- Read what each case tests
- Your solution fills in the answers
- Accept the ones you want