Hi, Codeforces! :)
I'm glad to say that IOI 2017 will begin officially tomorrow in Tehran, Iran!
During the event, we try our best to keep you updated with the news and medias and you can follow them on these channels:

• The official site
  
• Facebook page (there's also a facebook group linked to the page)
  
• Twitter page
  
• Instagram page
  
• Youtube page
  

And of course Codeforces, as a great community of relevant people!
So I invite participants to share their experience of the event here with #ioi2017iran.

Best of luck! :)
UPD1: Live coverage of the opening ceremony is now available at our Instagram and Facebook pages!
UPD2: You can see the live scoreboard of the contest Here!
UPD3: The online mirror round starts exactly one hour after the start of the official contest at Yandex.
UPD4: You can watch the Live Broadcast of IOI 2017 at youtube.
UPD5: All of the problems, with the translations, are now available Here.
UPD6: You can participate in the mirror contest of Day2 at Yandex.

Look at these users:
FastYes
Dong5k
akatsukiLH
Uni
MahooshojoNHB
tankmagiciangirl
TankKiller
dashabi
JayYeV
tuiyigou02
Ronnoc_4
Ekaterinburg
h1me
__LH
5130309070
MonsterGentlemanLYP
d_omg
zzv
They gained high ranks of last 4 Div.2 Only contests, maybe few of them are really new users but it seems that most of them are div1 users who register new accounts for participating in div.2 only contests officially (look at their register and last visit time).
I think there is no difference in participating officially or unofficially, this only makes the competition harder for div.2 users for they should compete with div.1 users.
Anyway this is wrong, but high number of div.2 only contests is also a reason!
Please prepare contests for both divisions more often!

UPD Is there anyway to prevent from such multi accounts?
UPD2 Preparing contest for both divisions is the ideal solution! And if it is not possible, as most of the comments say it is a good idea to rate only users that have participated in at least one (or more) contests!

Hi!
I wonder why this submission(5616462) gets TL for problem 346C - Number Transformation II.
Isn't it true that the order of this code is almost O ((a-b) log(a-b)) which is equal to O(10^6 * log(10^6))?

UPD. Found my answer in this comment, Thanks!

Hi!:)

Let's discuss Bayan Programming Contest problems here.
You can find the problems here : Bayan Programming Contest Final Problems!

I think the problems are interesting but hard!!

UPD1. I posted this blog after the discussion with Arterm at Bayan's blog.
UDP2. If you know a judgement for this problems let others know, too.

Hi!:)
Codeforces Round #200 is coming!!
Is there any special plan for it, like Codeforces Round 100?

Hi!
I have a problem in problem 279C - Ladder
When I submit my code, I get this error : wrong answer Participant output contains extra tokens (test #8) 4263959
but I output exactly m answers!
I had submitted a code 3264828 for this problem many months ago which got wrong answer on test 19, but when I submitted it again it got the same error on test 8 4263975. Maybe something with the judge has changed.
when I searched for the error, I found this blog entry which the author had the same problem, but there was no solution!
Is there anything wrong with the judge?
Thanks!

UPD. The problem has been solved, Thanks!

Hi!

I think there is a bug in counting the solved problems in problemset standings.

Solving problems Div2C and Div1A increases the solved problems by 2 , but it shouldn't because the problems are the same. Getting Accept for Div1A after Div2C shouldn't increase the solved problems.