MikeMirzayanov's blog

By MikeMirzayanov, history, 4 months ago, In English

Goodbye, 2025. Hello, 2026!

Dear Santa, Please make 2026 a happy year—not just for me, but for everyone. We all need this.

Hello, 2026!

And of course, we have our traditional gifts!

Change Handle Feature

Hurry! Until January 10, you can change your handle (but only once)! Note that next time you will be able to roll back the change or request another handle change only after a year (in December 2026). Choose wisely!

You can change your handle to a new one that hasn't been used by anyone else, or to one that you've previously used. Links to your old profile will automatically redirect to your updated profile.

Again this year, if you've participated in at least 10 rounds, you can request the handle of an inactive participant. This means the participant must have had a period of activity on Codeforces lasting at most 180 days, and this activity must have occurred in 2022 or earlier. The inactive participant must not have posted comments, messages, or similar content, and they must not have participated receiving 'Accepted' in more than 2 contests. In such cases, the handle will be automatically renamed, and the original owner will be notified via email. If the original user requests their handle back, we will roll back the change and restore your previous handle.

If you're unable to change your handle, it means some of the requirements have not been met. Please do not ask me to intervene manually. I especially dislike requests such as, "This is my second account; I took an interesting handle myself." I'm not Santa Claus!

Speaking of handles, I always reminisce about one particular story. Once, a user sent me this message: "Please change my handle from I_love_Valya to I_love_Sveta, as I no longer love Valya..."

New Year's Masquerade of Colors and Ranks

The traditional magical tab has appeared in your profile settings. Happy New Year!

  • Vote: I like it
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Vote: I like it +14 Vote: I do not like it

Merry Christmas and a Happy New Year :)

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Vote: I like it +13 Vote: I do not like it

The test results are so interesting!

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Vote: I like it -41 Vote: I do not like it

Horray! Have been waiting for a year (^o^)/

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Vote: I like it +6 Vote: I do not like it

I would like to change my handle to Auchenai, but failed?

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It seems our wishes were heard by a higher power...

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Where can i get one of those christmas ornaments?

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Vote: I like it +40 Vote: I do not like it

mambo

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Rev. 3  
Vote: I like it +7 Vote: I do not like it

I want to change my handle to baskota. The current owner of this handle has been inactive for four years, did not participate in any contests, and their active period lasted less than a month.

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Vote: I like it +34 Vote: I do not like it

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Vote: I like it +7 Vote: I do not like it

Now MyBrainGotTLE can finally change his username

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Vote: I like it -12 Vote: I do not like it

manifesting red :3

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Vote: I like it -11 Vote: I do not like it

Wow! The Christmas theme is so amazing

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Why can't we get the over 4000(tourist) color?

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wow i tried to change my handle to catboy and it failed despite all the criteria being met.

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Vote: I like it -11 Vote: I do not like it

am a gm frr

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Wishing you 12 months of peace and progress.

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Finally, now i can flex my crush.

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Wishing everyone of you that "May God fulfil your all wishes in this new year". Specially the wishes that you had about your Rating in codeforces. Happy New Year to all.

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Thanks, Happy New Year to everyone :) May upcoming year be full of AC for everyone)

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Vote: I like it +3 Vote: I do not like it

must have had a period of activity on Codeforces lasting at most 180 days

What counts as activity? I tried to get a handle (https://mirror.codeforces.com/profile/mariza) with zero submissions, no comments or blogs etc but it says it's in use. The only problem I can think of is that the last visit is 3 years after the registration date. Does that count as more than 180 days of activity?

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Vote: I like it +8 Vote: I do not like it

I would like to change my handle to Yukino (https://mirror.codeforces.com/profile/Yukino) but failed to do so for some reason. This person has only made two submission in 2014 on the same day (non-contest, one accepted, other CE) and has never participated in any blog or comments. I believe this satisfies the criteria. Their last visit was 11 years ago.

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My first Christmas with Codeforces excited a lot Merry Christmas to everyone

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But why does he not love Valya :)

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Vote: I like it +3 Vote: I do not like it

The true lgm is here.

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Got to pupil this year, hopefully Expert by next !

Happy New Year !!!

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Vote: I like it +1 Vote: I do not like it

We should be able to be unrated

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Vote: I like it +127 Vote: I do not like it
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Vote: I like it +1 Vote: I do not like it

Well, I see both zeyd1234 and LonggVuz will participate. And me too as 3snowflakes. Hope we will all get positive delta and hacks for the first time=)))

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Wait.. if you have max rank higher than 4k and if you change your handle, will your rank also change?

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I would like to know, how many competitions do I need to participate in at least to gain the right to modify my handle? I really appreciate it if someone could answer this.

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This magic is so interesting!haha

Happy new year,every one!

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Merry Christmas and a Happy New Year

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Not even magic can get you the tourist rank.

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Vote: I like it +3 Vote: I do not like it

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maybe increase the number of characters allowed in username to like 40? I wanted my handle as something else but had to settle for this because of the character limit(that too with improper spacing T_T)

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Vote: I like it +5 Vote: I do not like it

can i change contribution color instead ?

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Vote: I like it +41 Vote: I do not like it
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Vote: I like it 0 Vote: I do not like it

how can one change username ?

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test results are crazy

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Rev. 2  
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happy new year

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why i cant swap my name to SAJJAD ???

his last visit is 15 years age !

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Happy New Year!

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Where can we get such New Year's ball?

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would I ever be able to create a new account with my old handle

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Vote: I like it +1 Vote: I do not like it

I would like to change my handle to "Cat", as the account https://mirror.codeforces.com/profile/cat has been inactive for many years. The account has activity only on a few days in 2014, has no blogs or comments, and no significant participation since then. I believe it meets the criteria specified in the blog.

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Vote: I like it +2 Vote: I do not like it

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Vote: I like it 0 Vote: I do not like it

Boom!

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Rev. 2  
Vote: I like it +6 Vote: I do not like it

Ah, the contests with the greatest number of LGM participants.

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Why there is no tourist rank tho ><

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Happy new year!

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merry christmas

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Vote: I like it +2 Vote: I do not like it

I loved the magic of VERDICT of submissions.

See the verdict here
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Hi MikeMirzayanov! Thanks for implementing this feature. I'm have a third-party application that uses the Codeforces API and OAuth to track user profiles. I noticed that querying user.info with an old handle returns the new handle, which is very helpful for syncing handle changes automatically.

Quick question: Is this redirect behavior permanent, or is there a time limit after which the old handle stops redirecting to the new one? For example, if someone changes their handle from oldHandle to newHandle, will querying user.info?handles=oldHandle always return newHandle, or will this mapping expire after some time (e.g., 30 days, 1 year)?

This would help me design a more robust sync mechanism. Thanks!

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Let’s solve harder problems, break limits, and keep improving Happy New Year to all coders!

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cyan looks good with my profile picture

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so basically you can change your handle what you want but if you want to take someone's else name, you need to participate at least 10 contest, i couldnt delete my account so my name will be random.

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Happy New Year!

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Hope I can get 1300+

Happy New Year!

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Vote: I like it 0 Vote: I do not like it

more people should change their rating to specialist (persona reference)

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Vote: I like it 0 Vote: I do not like it

Your handle can't be changed because you haven't participated in enough contests

May I know that, how many contests do I need to participate in before I can change my handle?

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Vote: I like it 0 Vote: I do not like it

I have participated in 10 contests, but I can't change my handle?

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I kindly ask you to reply to my message.

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Vote: I like it +68 Vote: I do not like it

Please stop chaotic verdict message, I was so bothered during the contest...
But short logos of verdict (like [WA2]) is good, please keep it after the new year's chaos.

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After rating change, my color reverted to normal :< Did this happen to anyone else?

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I'm unable to change my username, it's showing that I haven't participated in enough contests.

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well i am participated in 4 contests only ,can i change my username or handle .i really want to know and when will this event start ?

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can anyone please tell me how I can change my username?

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I'm waiting GTA VI in 2026!

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Thanks a lot for this once in a year opportunity.

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am so excited to that contest btw

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Nice Colors

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was waiting for this opportunity to change the handle.

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New year, new journeys. Hope to be really a LGM>

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After changing the username, if we search for our previous username, it does not direct us to our profile. if this could be done, then it would be great

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Mery Christmas and Happy New Year

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Merry Christmas and a Happy New Year (。・∀・)ノ

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Happy New Year :)

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Happy New Year! 新年快乐!

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magic will include ranks such as headquarters, unrated, tourist/jiangly when?

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    Vote: I like it -6 Vote: I do not like it

    I doubt any of those except possibly unrated would be added, simply because headquarters would introduce far more scams for impersonators, and tourist/jiangly ranks (4,000+) are based on your own handle, which would require Codeforces to put your own handle as your rank which could be done with API calls but likely won´t due to the sheer rarity of the title or resource limitations from thousands or more users calling the API to change their title.

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HeLLO Mike,

https://mirror.codeforces.com/edu/course/2/lesson/4/1 this page can not opened it always show

A timeout occurred Error code 524 Visit cloudflare.com for more information.

would you plz find ppl to fix it thanks so much!

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Could anyone tell me does the contest "Hello 2026" rate? I'm a new user to Codeforces. Thx.

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GG I think that was a great year for everyone , best wishes in future year :)))

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Happy New Year!!!

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Merry Christmas and happy new year!!!

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Manifesting Expert !

Happyy New Year <3

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I've changed my handle but still seeing my old handle in the up right corner in front of the Logout button.. will this change soon ?

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new year failure messages :D

crashing through the snow in an unassembled sleigh to the wrong address stuck in traffic all the way

passed sample test case one code made it past flight two were aren't allowed no fun, cuz sleigh broke halfway through

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Happy New Year, CodeForces! :)

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I haven't participated in a lot of contests but I was waiting for handle change for more than 4-5 months. Its sad that i'm not able to change my handle but everybody else can :(

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Vote: I like it -8 Vote: I do not like it

Hello,

I would like to respectfully appeal the plagiarism accusation regarding my submission [355395767] for problem 2178F. I want to clearly state that I did not copy code from any other participant, nor did I intentionally share my solution with anyone. My solution was written independently during the contest. The problem is quite standard in terms of approach and implementation, and it is very likely that many participants arrived at a similar idea and structure. I did not use any public code-sharing platforms, public IDEs, or external sources during the contest. If the similarity is high, I believe it is an unintentional coincidence caused by a common and straightforward solution pattern for this problem. I fully respect Codeforces rules and fair play, and I would never knowingly violate them. I kindly ask you to review my case once again. If there is any additional information or clarification needed from my side, I am more than willing to provide it.

Thank you for your time and consideration. Best regards, Moein007

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Missed the name change by a month :(

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Vote: I like it -6 Vote: I do not like it

test