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Разбор задач Educational Codeforces Round 168 (Rated for Div. 2)
Codeforces (c) Copyright 2010-2026 Михаил Мирзаянов
Соревнования по программированию 2.0
Время на сервере: 20.04.2026 09:29:39 (f1).
Десктопная версия, переключиться на мобильную.
При поддержке
Is it just me or did almost everybody get fail testcase 19 on D at least once? Took me 30 mins to find the overflow.
I am getting error in test case 19 too. what was the issue with yours?
he mentioned overflow
Like what specifically was overflowing
Make a line graph with value of root node as 1 and for all other node as zero. You will see that the 'value needed' will essentially double each time and so if you have more than 32 or 64 nodes(depends on whether you took integer or long long), it will overflow
1<--0<--0<--0.....
A,B I read for more than three time.
can you add some subtitles to the video? I would appreciate it because it is really hard to understand for us foreigners
YouTube automatically adds after 1k views
How irritating questions like B are . Very confusing needs to read three to four time to understand what actually the question wants.
nice F:)
To be honest, I think it is extremely improper to add this problem to the contest as F.
I just purely want to know how to reach 1500 rating ? Concretely , Div 2 need to this level , which solved three problem in time ? Could anyone instruct me , please?
You want to reach 1500, yet 75% of your solved problems are rated below 1500. Just practice problems +200 of your rating.
"I mean, what kind of performance is needed in Div2 or Div3 to reach a rating of 1500?"
In Div. 2 it is enough to solve ABC, doesn't matter how fast, in Div. 3 solve ABCD fast or ABCDE. Take this with a grain of salt since contest difficulty varies. I would recommend downloading the Carrot extension which allows you to see your performance in the standings page.