When I submit a code, I get the error message "You cannot submit the same code twice", although this is clearly not the case. As far as I can see, I'm not the only person affected.
Hopefully this will be resolved quickly.
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I think it's fixed now.
Weird bug
It also works for me now
It was a temporary bug due to the update: now it is reliably impossible to submit the same code twice (via Codeforces, m1/m2/m3 do not check it). Previous checking was invalid because of race condition: we validated request and after save submission — in case of two pretty simultaneous submissions, both can be validated and saved. Now it is not a case.
After 2692 tasks you still have something to submit...WOW
Around 2000 to go :)