ahmed_aly's blog

By ahmed_aly, history, 10 days ago, In English,

I'm sadly announcing that a2oj.com (A2 Online Judge) will be retiring by end of 2019, I'll shut it down at midnight on New Year's Eve. It was something I took care of for about 10 years.

I'm really sorry, but I prefer not to explain my reasons, so please don't ask me why I'm doing this, it was hard enough for me to make this decision, and also please don't try to convince me to change my mind.

I'd like to say thank you to everyone who used it, and please accept my sincere apologies for shutting it down.

If you have something good to say about A2OJ (how you used it or how it helped you in any way), I'd love to read that, please send it to the following email (or in a comment here): bye@a2oj.com

Also please feel free to take a copy of any data you can access, and if you need some data in a specific format, please send your request to the following email: bye@a2oj.com (if the data isn't public, make sure to send from your registered and verified email which can access this data). I'll do my best to fulfill all requests.

Please only use the above email, because soon I'll be deactivating my personal Facebook account again, I'll also deactivate A2 Online Judge.

Edit 1: I'll keep a static version of all Ladders & Categories.

Edit 2: Here's how I generated the ladders, in case if anyone wants to implement it: https://codeforces.com/blog/entry/47442

 
 
 
 
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10 days ago, # |
  Vote: I like it +26 Vote: I do not like it

I just started using it and sadly its retiring already. But, thanks for your 10+ years of work for newbies like me.

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10 days ago, # |
Rev. 2   Vote: I like it +9 Vote: I do not like it

is there any other sites as such which can help us like a2 online judge ahmed_aly?

and thanks for the site. I had recently started using it again

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10 days ago, # |
  Vote: I like it +15 Vote: I do not like it

It's so sad to know that you will be closing the site. Good luck for your future.

Can anyone please make a Google sheet for all the ladders that are present on A2OJ.

Thanks in Advance.

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    10 days ago, # ^ |
      Vote: I like it +78 Vote: I do not like it

    I'll keep static pages of all Ladders & Categories.

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      10 days ago, # ^ |
        Vote: I like it +7 Vote: I do not like it

      means there will be no updates in the website but the problems will be there

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        10 days ago, # ^ |
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        Does that mean I can access those ladder, feature of problem dependency will be there or not?

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      10 days ago, # ^ |
      Rev. 5   Vote: I like it +160 Vote: I do not like it

      Instead of a static version of ladders. How about creating a cf group named "A2OJ" and adding all ladders under contest "Ladder Name: 20 — 2100 <= Codeforces Rating <= 2199 (by ahmed_aly)"
      It can at least replicate a similar experience and much more useful than static version.
      I̶ ̶c̶a̶n̶ ̶c̶r̶e̶a̶t̶e̶ ̶a̶ ̶g̶r̶o̶u̶p̶ ̶a̶n̶d̶ ̶p̶r̶o̶v̶i̶d̶e̶ ̶w̶i̶t̶h̶ ̶m̶a̶n̶a̶g̶e̶r̶ ̶r̶i̶g̶h̶t̶s̶ ̶i̶f̶ ̶s̶o̶m̶e̶o̶n̶e̶ ̶w̶a̶n̶t̶s̶ ̶t̶o̶ ̶v̶o̶l̶u̶n̶t̶e̶e̶r̶ ̶f̶o̶r̶ ̶t̶h̶i̶s̶ ̶j̶o̶b̶.̶

      Update 1: dmkozyrev volunteer to add some ladders. I created a Public group if anyone wants to add ladders read How to contribute blog.

      Update 2: Access them here. Thanks to @ahmed_aly for creating a2oj platform and @dmkozyrev for creating these mashups.

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        9 days ago, # ^ |
        Rev. 3   Vote: I like it +75 Vote: I do not like it

        Added all ladders from 11 to 21, please check

        UPD. Added ladders from 22 to 31

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          7 days ago, # ^ |
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          Thanks dmkozyrev .

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          2 days ago, # ^ |
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          The ladders are there... although there is one thing... all the questions in the ladder are from codeforces... but the question opening through your ladders open with some other link.

          This is not a problem actually ; but the issue is that other options which are attached with a problem ( example the tutorial , announcement option ) is missing. Announcement may not be that important ; but I think tutorial is.

          Plus the submission history of the problem is not the actual history of the problem ; it is not showing my previous submissions of the same problem ( If the previous submission of the problem was done through codeforces itself ).

          I don't know if the missing of tutorial option and non-availabilty of previous submissions is some bug or a feature yet to be implemented...

          But it is indeed correct that a2Oj was a life saver and by keeping it alive through some alternate form ; you guys are doing a great job... It would be nice if you could do something about the tutorial option.

          Thanks !

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      10 days ago, # ^ |
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      Man you are the best. Thanks for your 10+ years of work and helping people to improve their coding skills systematically using the online judge. Thanks

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    8 days ago, # ^ |
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    ask ahmed sir i too need it..

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10 days ago, # |
  Vote: I like it +113 Vote: I do not like it

Just a suggestion: Can the ladders be included somehow in Codeforces website. Its a really good collection of problems.

MikeMirzayanov Sir can this be done?

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10 days ago, # |
  Vote: I like it +3 Vote: I do not like it

Auto comment: topic has been updated by ahmed_aly (previous revision, new revision, compare).

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10 days ago, # |
  Vote: I like it +130 Vote: I do not like it

why not giving it to someone who can care instead?

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10 days ago, # |
  Vote: I like it +1 Vote: I do not like it

I was currently using it for improving my skills for div2 C and D problems. This is really a sad newss :(

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10 days ago, # |
Rev. 2   Vote: I like it +30 Vote: I do not like it
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10 days ago, # |
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why i am really sad ! the ladder helped me a lot and still .. i wish you can change your mind

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10 days ago, # |
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I just started using it few weeks ago and its sad to know that it will be closed soon . The ladders was an awesome concept and i am very much thankful for that.

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10 days ago, # |
  Vote: I like it +16 Vote: I do not like it

M3lsh..

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10 days ago, # |
  Vote: I like it +93 Vote: I do not like it

The ladders have helped me a lot in progressing (especially the feature about not being able to look at the next problem unless you ac the current one). Thanks for creating it in the first place.

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10 days ago, # |
  Vote: I like it +23 Vote: I do not like it

Sad to hear this. Your site helped me and my friends a lot. I'm grateful for all the work and effort you've put in. If you decided to do so, then go ahead.

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10 days ago, # |
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seriously Why doesn't Codeforces have Sad reacts? :"(

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10 days ago, # |
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I use this site mostly to find the problem in category.

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10 days ago, # |
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F

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10 days ago, # |
  Vote: I like it +65 Vote: I do not like it

This site was super helpful for me after I finished USACO training pages. Thanks for making it :) I'm glad you're keeping a static version of the ladders/categories.

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10 days ago, # |
  Vote: I like it +26 Vote: I do not like it

Open source it.

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10 days ago, # |
  Vote: I like it +1 Vote: I do not like it

It's very helpful for all programmers because there is a set of problems for all categories, Ladders are so helpful for all programmers also.

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10 days ago, # |
  Vote: I like it -116 Vote: I do not like it

vjudge >> a2oj

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10 days ago, # |
Rev. 2   Vote: I like it +2 Vote: I do not like it

End of an era. Thanks man Ahmed

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10 days ago, # |
  Vote: I like it +93 Vote: I do not like it

Maybe you could find someone willing to host it instead.

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10 days ago, # |
  Vote: I like it -58 Vote: I do not like it

Kindly do not deactivate! I have just started using it.It is quite useful. Kindly change your mind please.

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    10 days ago, # ^ |
      Vote: I like it +87 Vote: I do not like it

    and also please don't try to convince me to change my mind.

    And I really like how this is not even an elaborate attempt to change their mind, there's no reassuring speech, no "A2OJ has been so important to many", no arguments at all, just "pls change your mind!!"

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      10 days ago, # ^ |
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      There are probably so many reasons, that he couldn't list them in a single comment. :)

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10 days ago, # |
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please make an excl sheet of every categories and ladder also. Thanks <3

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10 days ago, # |
  Vote: I like it -35 Vote: I do not like it

idk but it was the great site for beginners, please don't shut it down :( please.

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10 days ago, # |
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F

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10 days ago, # |
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Ladders help me a lot. I will miss you A2. And thanks for your contribution.

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9 days ago, # |
  Vote: I like it -8 Vote: I do not like it

If possible please hand it over to someone or rather Codeforces to take care of it and continue updating the website as it has been very helpful to many of us and will be helpful in the future.

Thanks for all the efforts.

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9 days ago, # |
  Vote: I like it +6 Vote: I do not like it

thanks you so much a2oj

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9 days ago, # |
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how about the chances to re-run a2oj in the future?

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9 days ago, # |
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I can't receive verification email,and it isn't in the spam,is it still working?

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9 days ago, # |
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"I am not crying......"

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9 days ago, # |
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a2oj, ffffffffffffffffffffffffffffff, please make your project open source or give someone who can care about it

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9 days ago, # |
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The ladders have helped me a lot. Thank you so much a2oj we will miss you. Goodbye :(

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9 days ago, # |
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My memories <3 Bye

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9 days ago, # |
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Thanks for 10 years of dedication :((

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9 days ago, # |
  Vote: I like it +3 Vote: I do not like it

Is it possible to create a group here in CF and then add all ladders as contests, because the problem selection in the ladders is very nice.

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9 days ago, # |
Rev. 2   Vote: I like it +10 Vote: I do not like it

I am really very sad to hear it. It was a large online judge with problems of tasks from various sources with handy ladders & categories. Your site really helps me and my friends... Thank you for 10 years of hard work!

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9 days ago, # |
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Will miss A20j badly. The ladder have helped me a lot. As you made up your mind, I will respect your decision, but its a request from whole cp community to please make your project opensource. Thank you and good bye A2oj :(

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9 days ago, # |
  Vote: I like it +23 Vote: I do not like it

Can you please add the contests on the website to the Codeforces Gym? These contests have great value and many people can get benefits from them.

I'm willing to help you with this

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9 days ago, # |
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I wish one day someone will come forward and make something like a2oj and help the newcomers to get the best pathway for better problem solving as it did to me .. #will_miss_u_a2oj.

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9 days ago, # |
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I had been a wanderer in terms of problem solving, with no proper idea or plan on how to practice well to solve more problems in contests. Thus my progression in terms of effective practice had been going down the ranking. Thanks to A2Oj I not only beleived that the ladders would be effective if I solved accordingly, I have also been getting the results.

Thank you so much. Good luck.

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9 days ago, # |
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please please don't do this if you are shutting it down can you please merge it with code forces

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9 days ago, # |
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This site help me alot thanks for your hard work And i wish good for you

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9 days ago, # |
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Auto comment: topic has been updated by ahmed_aly (previous revision, new revision, compare).

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9 days ago, # |
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I am so sad .... A2 Online Judge helped me a lot in my past . Thank you man for every thing you did ahmed_aly .

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9 days ago, # |
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“Say bye .”
"Bye Bye!"

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9 days ago, # |
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Oh no!!!!!!!! That's too sad !!!!!!!!!!!!

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9 days ago, # |
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Thank you for all your hard work. Please accept my gratitude as your ladder helped me alot to overcome and understand how to practice CP.

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8 days ago, # |
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can anyone please explain me what difference will occur after static version.means then also we can access problems and solve them.so what will be difference??

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8 days ago, # |
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I used a2oj during last winter holiday, it helped me gain pretty much CP knowledge and win a gold medal in this year's ICPC, thanks and goodbye.

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8 days ago, # |
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Bye a2oj, you were an incredible online judge and I will solve on you till the last moment

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8 days ago, # |
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A2OJ really helped me a lot in improving my coding skills. Thanks a lot man A2OJ will be remembered forever

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7 days ago, # |
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nooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooo

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6 days ago, # |
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When i found this,I was a beginner! CP was new for me! These ladders are good teachers especially for people like me who give up quite fast when you cant find the solutions in few minutes or hours!but unable to get the next question kept me trying my best to find out the other ways of doing the current question!

much thanks to ahmed! thanks a lot! from--> A BEGINNER !

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6 days ago, # |
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This sounds not good for me. By the way, this site was very helpfull.

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8 hours ago, # |
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Would you please export all the ladders ?