Hello

I feel that there should be a feature to report errors/bugs in Codeforces.
One of the fastest and efficient ways to eliminate errors is through user feedback as adopted by most of the major companies. This should make the process centralised and easier for Codeforces team.
Maybe everyone could check the submitted reports and their status.

What are your suggestions/thoughts about it?

Hello

Is there any easy way to implement a set supporting following 2 operations in O(log(n)) ?

1)Insertion
2)Count of elements in the set having value <= x. (x is an Integer)

Values inside set can be from 1 to 1e9.

I am sorry if this in an easy/standard problem.

For several hours now the site is not working properly and was down too some time back.
Also last round (Educational Codeforces Round 85 (рейтинговый для Див. 2)) system testing is stuck at 88% for few hours.
When is this expected to settle down?

With increased number of participants nowadays rating seems to increase easier than before.

Have titles like "candidate master", "master" etc. lost their original significance and meaning?

What are your thoughts about the same?

Hello

Can someone give a solution for the following problem:

Problem link: here (Editorial is in Japanese)

Hello guys

I am not able to understand the editorial solution for the given problem: https://atcoder.jp/contests/abc155/tasks/abc155_f

Editorial: https://img.atcoder.jp/abc155/editorial.pdf (Last Page).

It seems a standard and interesting problem. Any kind of hint/solution will be much appreciated.