For the last few days, I’ve been facing extremely long judging times on Codeforces. Many submissions are taking 20–30 minutes to get a verdict, even for simple problems.

This becomes a big issue during contests — sometimes I need to wait around 15 minutes just to see if my solution is correct. It’s stressful and affects the contest experience.

I really love solving problems on Codeforces, so I wanted to share my thoughts. If possible, please look into the current judging queue issues.

Today I solved this problem 1791F - Range Update Point Query. My first submission:345869729 & second submission:345873398 .

As you can see, those two codes are exactly the same. The only difference is: In first submission, I wrote auto it=lower_bound(all(s),l) & in 2nd submission, I wrote auto it=s.lower_bound(l), where s is a std::set . But, as far I know, both of these functions are of logarithmic time complexity. Then, why did I get TLE in my first submission? Please, explain.

Now, a newbie who has solved only 11 problems and registered a few days ago can perform better than experts and specialists. Is this thing actually possible or legal??