you see, this submission here is a normal Accepted submission for problem 1993C which was submitted while the contest was running.
but actually, it is an O(n*k) solution and if you tried to submit the same code now like this submission it gives you TLE on hack test 22 which does make sense yes but why is it still Accepted for participants who already submitted similar solutions for the problem during the contest? didn't the problem get rejudged or what?
I believe there will be a big difference in rating changes for this round if problem 1993C is rejudged.
take a look Mr. MikeMirzayanov!
this is not a new thing at all, the system tests weren't strong and some people got through with bad solutions because they didn't get hacked during the contest. this is not the only time it happened, and it's not an error by codeforces
yeah like one time light switches problem people had linear search passed through system test but if u now submit the linear search code then it gives tle on test 23