TomaKapec's blog

My code was accepted during the contest but failed after system testing what happend?
By TomaKapec, history, 17 months ago, In English

So I took part in the Codeforces Round 886 for Div4 and quite enjoyed the contest. I was able to solve all but the last problem but unfortunately, my solution for the G task got hacked which was quite annoying then the next day after hacking and system testing it said that my solution for task F also isn't correct and that it TLE-d but during the contest (and after it) It clearly said that my solution is correct. I searched on Google and didn't find anyone with a similar problem. Can anyone explain what happened and is there any way to fix that?

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17 months ago, # |
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You didn't find anyone with FSTs and hacking? What did you even google? The first result on google is this https://mirror.codeforces.com/blog/entry/6249

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17 months ago, # |
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Basically, when people hack another people's submissions, server keeps hacking tests, so they will test them after contest to every submission. It was made because authors can't write a lot of tests which takes a lots of time, and people want contest more often.

So next time be fully confident before you send your solution.

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    17 months ago, # ^ |
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    Aha, thank you so much that is a bit annoying but at least it maked sense

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      17 months ago, # ^ |
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      Yeah, for sure. Once i was ~2000 place(which is very rare for me), but after contest my solution for problem A was dropped. Carrot showed ~+70, but after hacks it straightly went into negative side. :(

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