hitman623's blog

Mathmania — Codefest'18
By hitman623, history, 6 years ago, In English

Hi, Codeforces Community!

Codefest'18 — a diverse roster of high-quality programming competitions by Department of Computer Science and Engineering, IIT Varanasi is excited to present Mathmania.

Mathmania is a mathematical puzzle contest where a sound knowledge of mathematics together with computational thinking will be essential to solve problems. The motivation behind Mathmania is to provide a platform for the inquiring mind to dwelve into unfamiliar areas and learn new concepts in an exciting way.

The contest will take place at Topcoder. This contest will be an individual event with a duration of 3 hours, from Sep/1/2018 12:30 UTC. The contest will be unrated for both Div1 and Div2 participants but will be a long match which will consist of interesting mathematical challenges covering almost all domains of Mathematics, ranging from Number Theory, Algebra, Geometry, etc.

The contest has been prepared by iit_sujal, GT_18, Enigma27, vinayjaisinghani and hitman623.

Prizes -

1st Place : $200

2nd Place : $150

3rd Place : $75

Best ranking member in India: $75

Topcoder- Mathmania T-Shirts for top 30 participants.

Best two freshers/sophomores from IIT (BHU) will also receive T-Shirts.

Registration:

Go to Topcoder Arena – arena.topcoder.com(Beta) or setup Topcoder Java Applet*, you will be able to register for the contest.

*In Topcoder Java Applet – you can find the contest listing in Active Contest Tab

Have questions? Email support@topcoder.com

Never Competed in a Topcoder Contest: See this to understand Topcoder Contests better!

UPD : The contest starts in an hour.

UPD : Hope you enjoyed the contest. We apologise for the technical issues you faced during the contest. For all those whose efforts went in vain in the 600 points problem, don't worry we have a consolation prize for you.

UPD : The editorial is published here. Solutions for last 3 problems will be added soon.

UPD : The editorial is complete. Feel free to discuss anything in the comments.

  • Vote: I like it
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Comments Comments (38)
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6 years ago, # |
  Vote: I like it 0 Vote: I do not like it

Auto comment: topic has been updated by hitman623 (previous revision, new revision, compare).

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6 years ago, # |
  Vote: I like it +12 Vote: I do not like it

Hi, is it going to consist of programming problems, or output only problems?

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6 years ago, # |
  Vote: I like it +40 Vote: I do not like it

Can you reschedule the contest? It clashes with AtCoder (which has had its contest announced for a long time)? :(

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    6 years ago, # ^ |
      Vote: I like it +14 Vote: I do not like it

    When the time was decided, AtCoder contest was not scheduled actually and at night a contest on codechef was scheduled. And it will be really tough to reschedule it now.

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6 years ago, # |
  Vote: I like it 0 Vote: I do not like it

Auto comment: topic has been updated by hitman623 (previous revision, new revision, compare).

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6 years ago, # |
  Vote: I like it +15 Vote: I do not like it

Cannot login to the web-based arena

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6 years ago, # |
  Vote: I like it +4 Vote: I do not like it

Is topcoder down? Nothing seems to be loading.

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    6 years ago, # ^ |
      Vote: I like it -16 Vote: I do not like it

    Is it good now? — We were in the process of fixing 800 problem. If you were logged out! Please re-login and you would be able to compete!

    Sorry for the trouble caused!

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      6 years ago, # ^ |
        Vote: I like it +2 Vote: I do not like it

      It's stuck with the following message:

      Completing login... One moment please...

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        6 years ago, # ^ |
          Vote: I like it -19 Vote: I do not like it

        Try incognito! Will work!

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          6 years ago, # ^ |
            Vote: I like it +1 Vote: I do not like it

          still facing a problem

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          6 years ago, # ^ |
            Vote: I like it +1 Vote: I do not like it

          Same thing happens in Incognito.

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            6 years ago, # ^ |
              Vote: I like it -18 Vote: I do not like it

            Very Sorry! :( Do you have the java installed in your system. Take 5 mins and setup the java applet. http://topcodr.co/SRMGuide

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              6 years ago, # ^ |
                Vote: I like it +3 Vote: I do not like it

              I am not sure, but I believe that in this case java-applet also shouldn't work, because problem is in login time out. It should be a server-side issue so client (website or applet) doesn't matter here.

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                6 years ago, # ^ |
                  Vote: I like it 0 Vote: I do not like it

                It seems, that I am wrong. I successfully logged in with java-applet. Pretty strange.

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              6 years ago, # ^ |
                Vote: I like it +3 Vote: I do not like it

              i m still facing problem in ur java applet... it shows ur login timed out

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                6 years ago, # ^ |
                  Vote: I like it -8 Vote: I do not like it

                Try using it with a direct connection! Non — Proxy one!

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                  6 years ago, # ^ |
                    Vote: I like it +3 Vote: I do not like it

                  yes i try with direct connection....bt it still shows login timed out

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                  6 years ago, # ^ |
                    Vote: I like it +3 Vote: I do not like it

                  please tell....how i remove that error ur login request timed out....

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              6 years ago, # ^ |
                Vote: I like it +3 Vote: I do not like it

              I had made an account using gmail login, so I do not have any password, how can I login through applet?

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6 years ago, # |
  Vote: I like it +29 Vote: I do not like it

Really good problem set.....enjoyed solving those problems. Well done problem setters!

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6 years ago, # |
  Vote: I like it 0 Vote: I do not like it

hmehta It would be great if Topcoder can support Python 3 as well.

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6 years ago, # |
← Rev. 2   Vote: I like it +4 Vote: I do not like it

isnt 800 just solving AGP and GP sums of matrices(in a similar way to binary exponentation) ?

Also is there any fermat's little theorem for matrices?? (otherwise arent the contraints harsh for someone using c++ without Big Int).

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6 years ago, # |
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Auto comment: topic has been updated by hitman623 (previous revision, new revision, compare).

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6 years ago, # |
← Rev. 2   Vote: I like it 0 Vote: I do not like it

I got logged out of the arena at around 6:40 and was unable to login again during the entire contest :(

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    6 years ago, # ^ |
      Vote: I like it +8 Vote: I do not like it

    I had the same problem, I had done the first three, third couldn't be submitted :( But the problems seemed nice

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6 years ago, # |
  Vote: I like it 0 Vote: I do not like it

Explanation for 500 and 800?

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6 years ago, # |
  Vote: I like it +8 Vote: I do not like it

What happened to 600?

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    6 years ago, # ^ |
      Vote: I like it 0 Vote: I do not like it

    The last sample output in the 600 is wrong.

    I'm curious if those who submitted expect their solutions to be fast enough. My implementation was far too slow (38s on my machine) so I didn't submit, but it doesn't look significantly different to what tourist and uwi submitted.

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6 years ago, # |
  Vote: I like it 0 Vote: I do not like it

Auto comment: topic has been updated by hitman623 (previous revision, new revision, compare).

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6 years ago, # |
  Vote: I like it 0 Vote: I do not like it

Auto comment: topic has been updated by hitman623 (previous revision, new revision, compare).

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