So, first of all, I would like to apologize for the issue with the problem B in today's ER. We tried to fix it as quick as possible, but unfortunately, still lots of submissions were made and this caused a big queue during the round. I am sorry for this.
How did this all happen? Well, this is really a sad story about one commit.
About three hours before the round, while writing explanations for the problem B statement, I noticed that the answers were different from the correct values by 1. I opened the model solution in another tab in Polygon, wrote +1 to the value I printed, clicked "Save" and then committed the changes (including the notes for the samples). But, unfortunately, that change in the model solution wasn't included in the commit.
The cause was that the model solution didn't save in time for the commit (and actually never saved for some reason, maybe some bug in the browser or Internet connection issues). I didn't notice that, and while rereading the problem again, I never checked that part because "well, I fixed that thing, it is definitely correct now!"
The point of the story? Always recheck what you're actually committing. Always double-check even the parts of the problem you have already fixed, even if you're sure that after all the changes you've done, they're 100% correct.
I am again deeply sorry for the problems it has caused, and I hope that it won't happen again.
the mistake is fine, its just that the other problems and overall contest wasn't up to the mark either :(
writing explanations 3 hours before a contest? aren't these problems supposed to be ready days before the contest?
Let's get it to -200!
I completely cannot understand why there are so many downvotes here, what you said is very reasonable.
Red rating is always correct. I think other authors should even follow suite. They should complete their problems few hours before the round. It is more optimal and has been proven to work as seen above.
Your point is correct. But you got downvoted for this:
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and I thought my off-by-one errors were bad
you cost me a lot of time but it's alright:)
I solved 3 problems in the first 11 minutes, and in the 17th minute, I was surprised that problem B was wrong in the first test. This cost me +30 on my penalty, in addition to the psychological tension that reduced my concentration in the contest