hmehta's blog

TCO21 Round 3
By hmehta, history, 3 years ago, In English

The Round 3 of the Algorithm Competition of 2021 Topcoder Open is happening! It will take place on Thursday, July 8 at 07:00 UTC -4.

Please note that you must register for this round in the Arena. Registration is now open for the round in the Arena or Applet and will close 5 minutes before the match begins, so make sure that you are all ready to go. Click here to what time it starts in your area.

There will be a parallel rated round for those who are not eligible to compete.

Members eligible to compete in the Parallel Round include:
- Who did not qualify for Round 3
- Qualified for Round 4 or TCO21 Algorithm Finals from Online Stages 1, 2, 3 and 4

Don’t know how to compete in Topcoder Algorithm Competitions?
Check out this guide to successfully compete in an algorithm match.

You can compete using:

  • Topcoder Java Applet - You can refer to this guide here to set up the applet. (Note that those who have Java 8 installed on their machine will see a security issue — You will have to add Topcoder in security exceptions in Java Control Panel. Please refer to the details in the guide.)
  • Topcoder Web Arena(Beta) - Please watch this video for step by step guide

Some Important Links Match Results (match results, rating changes, challenges, individual test case results), Problem Archive, Problem Writing, Algorithm Rankings, Editorials and Older Editorials(SRM 710 and before),

Best of luck to you in the Arena!

- The Topcoder Community team

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Comments Comments (30)
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3 years ago, # |
  Vote: I like it +1 Vote: I do not like it

Should be Thursday, not Saturday

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

I think the top coder arena is down since yesterday, can you please have a look?

Also there's a date and day issue, either it should say 10th of July or Thursday...

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    3 years ago, # ^ |
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    I just checked the applet and web arena, both are working. If your Java got updated to Java 11 and you are using Ubuntu, please use https://openwebstart.com/ to make the applet work.

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      3 years ago, # ^ |
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      Thanks for the quick response, but I still can't log into the arena, I access it on a windows system and use the web arena, it just isn't authenticating and seems to get stuck...

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

        Can you try incognito as well? There were some auth issues last week but were fixed :)

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

      I was able to start the applet by disabling security checks, but it hangs when I try to log in.

      Upd: it seems something was wrong in my internet connection, now it works.

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

I'm struggling to execute Java applet in my Mac. I tried about 1 hour, but is stuck here:

netx: Launch Error: Could not launch JNLP file. ( (class "com.topcoder.client.contestant.ProblemModel"'s signer information does not match signer information of other classes in the same package))
net.sourceforge.jnlp.LaunchException: Fatal: Launch Error: Could not launch JNLP file. The application has not been initialized, for more information execute javaws/browser from the command line and send a bug report.

FYI I recently reinstalled my OS, and it's my first time participating afterward. I used this guide (https://opt-cp.com/topcoder-entry/) to install Java Applet.

Did anyone experienced the same?

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3 years ago, # |
  Vote: I like it +45 Vote: I do not like it

Explain pls what "1774 ms" means

pic related
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    3 years ago, # ^ |
    ← Rev. 2   Vote: I like it +14 Vote: I do not like it

    We will look into this. (My preliminary guess is that for some reason your solution got killed due to exceeding wall clock limit, and the reported time is the processor time used until that point. This is completely unofficial and with no data, just a guess to give you an idea how something like this may occur.)

    Please email talgorithm@topcoder.com with an official request to look into this so that it doesn't get lost, and we'll get back to you once we know what happened.

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

imo 400 was hackable for multiple people, I'm curious about system tests (if they will catch it). UPD: yes they did

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3 years ago, # |
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Nvm, managed to figure it out. :(

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

    How does your code perform on inputs where we select the same bag 2500 times in a row? E.g., some too-simple formulas can fail those due to division by zero.

    (If my quick math didn't fail me, a solution that is exactly 98% to solve any single question is about 99.6% to pass one whole 100-question test and about 93% to pass the full systests.)

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      3 years ago, # ^ |
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      Yeah, turns out my local testing did not try out when the bag selection is too unbalanced. Thanks for clearing it up.

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

Just to confirm, T-shirts will be awarded to the contestants who have a positive score in this round, right? If so, when and where to fill in the shipping information?

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

    Same question, and how much to get qualified for the 4th round.

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      3 years ago, # ^ |
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      Top 80 get qualified to 4th round

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    3 years ago, # ^ |
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    From my experience, you will get an email after sometime.

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

      The t-shirt designs are finalized around TCO Finals in Nov. You will receive an email to share your address details then and t-shirts will be shipped to you :)

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        3 years ago, # ^ |
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        Hi. When will you send Tco 21 regionals t-shirts?

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

I can't log in into web arena. It shown Complete login, one momen please ... And it didn't not allow me to access. I missed a competition because of server ...........

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3 years ago, # |
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Will there be TCO21 Round 3B?

I can see there was one in previous years (2020, 2019, 2017,...) but I can't find one in the TC public calendar.

According to this link, there is supposed to be one. I also saw it somewhere on clist.by calendar, but I can't find it anymore.

Can someone please confirm or deny, whether there'll be Round 3B? Thanks.

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    3 years ago, # ^ |
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    Poster here just mentions Top 80 from Round 3. Unlike Top 40-40 from round 3A/B last year.
    Even this post just says Round 3 instead of Round 3A.

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3 years ago, # |
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How many people are selected for the TCO21 regionals? I received an invite recently because of my TCO round 3 performance.

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    3 years ago, # ^ |
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    I didn’t participate in TCO this year, but received an invitation to a regional event

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      3 years ago, # ^ |
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      You must have participated in the SRMs, that is another track to get to the regional event.

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3 years ago, # |
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Has anyone received topcoder t-shirts for scoring positive in round 3 of TCO 21?

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