UPD 1: The issue has been resolved. Thanks to the Codeforces team for looking into it.
Hello Codeforces team,
I noticed an unexpected submission in my account's submission history and wanted to report it in case there is an issue with the system.
There is a submission for A — Monocarp's Contest dated September 22, 2026 at 15:27, which appears under my account.
However, I did not submit this solution, and I did not make any submissions at all on September 22.
Could you please check the logs for this submission and see how it ended up on my account?
I wanted to report it as soon as I noticed it, in case this is affecting other users as well.
Submission: 391645045
Thank you for looking into this.
Maybe you should change your password and check if it repeats?!
Either this is a bug from their servers or somebody's fucking with you.
If someone were tampering with my account "opening it and submitting a solution" it would appear in the activity log, and the color for the 22nd would change to green. However, it is showing as white, which means I haven't made any submissions.
If you resubmit a problem you have already solved, it isn't counted as activity.
Interestingly it does not show in your profile submissions list for me.
Be careful next time
the submission on the 9.22 was marked as "My contest submissions"...?!
Part of the reason might be that your password has been leaked. Please check your login history right away ( when a new device or new IP logs into your account, the system will automatically send a login alert email to your registered email ).
The password for your account may have been compromised!? Or it is just a bug...
If someone were tampering with my account "opening it and submitting a solution" it would appear in the activity log, and the color for the 22nd would change to green. However, it is showing as white, which means I haven't made any submissions.
Maybe yes,so be careful with your account next time.
Fortunately, the issue has been resolved, and this submission no longer appears in my account.
Add a update in your blog so pepole can know the issue and its current condition.
Thanks for the reminder. I've done it.
You need to keep an eye on your account all the time, safety first.
Auto comment: topic has been updated by -Pho3nix- (previous revision, new revision, compare).
Try submitting the same code and see if Codeforces tells you that you’ve already submitted it before.