DMOPC '15 November Contest

Welcome to the second Don Mills Open Programming Competition of the 2015-2016 school year!

The problem writers this time are k_53P, WallE256, cheesecake, Xyene, and FatalEagle.

This round will be rated for all participants.

You will not be able to view partial output during the contest.

Before the contest date, you may wish to check out the tips and help pages.

The contest consists of 6 questions with a wide range of difficulties, and you can get partial marks for partial solutions in the form of subtasks. If you cannot solve a problem fully, we encourage you to go for these partial marks. The difficulty of a problem may be anywhere from CCC Junior to CCO level. You will have 3 hours to complete the contest. After the contest window begins, you may begin at any time. Your personal timer will start counting down, and you will be able to submit until 3 hours from when you started, or until the hard deadline (9PM EST), whichever comes first.

After joining the contest, you proceed to the Problems tab to begin. You can also go to Users if you wish to see the rankings.

We have listed below some advice as well as contest strategies:

  • Start from the beginning. Ties will be broken by the sum of times used to solve the problems starting from the beginning of the contest. The last submission time of your highest score will be used.
  • Remove all extra debugging code and/or input prompts from your code before submitting. The judge is very strict — most of the time, it requires your output to match exactly.
  • Do not pause program execution at the end. The judging process is automated. You should use stdin / stdout to perform input / output, respectively.
  • It is guaranteed that all the problems will be solvable with C++.

At the end of the contest, you may comment below to appeal a judging verdict. In the case of appeals, the decision(s) of DMOJ staff is final.

After the contest finishes, we'll have a optional feedback form we would like you to fill out.

Good luck!


  • -1
    niamp  commented on Nov. 11, 2015, 5:57 p.m.

    Hey, just wondering how rating is calculated?

    • 4
      FatalEagle  commented on Nov. 11, 2015, 6:29 p.m. edited

      Roughly speaking, rating will increase if your actual place in the contest is greater than your expected place in the contest (according to current rating). For specific details, you can look at the DMOJ source code on Github.

  • 2
    baal_hammon  commented on Nov. 11, 2015, 10:28 a.m.

    why my profile does not show that i competeted in yesterday contest ??

    • 1
      cheesecake  commented on Nov. 11, 2015, 10:34 a.m.

      We apologize for the delay. Rating will be updated later today.

      • 1
        Xyene  commented on Nov. 11, 2015, 4:34 p.m.

        Ratings have been updated!

      • 1
        baal_hammon  commented on Nov. 11, 2015, 2:23 p.m.

        thanks !

  • 4
    TheRefep  commented on Nov. 10, 2015, 8:37 p.m.

    I feel like the 3 point question might be just a tad bit underrated.

    That is all :D

    • 0
      Xyene  commented on Nov. 11, 2015, 4:38 p.m.

      The point value of P1 has been bumped up from 3 points to 5.

  • 2
    bobhob314  commented on Nov. 10, 2015, 6:11 p.m.


  • 1
    FatalEagle  commented on Nov. 10, 2015, 11:33 a.m. edited

    System testing will be run regardless of whether your submissions pass pretests or not.

    • 1
      FatalEagle  commented on Nov. 10, 2015, 3:31 p.m. edit 2

      As a note, we will rejudge all TLE submissions on P4, P5, and P6 after system testing to ensure consistency and eliminate any differences that might occur due to your submission being judged on different judges.

  • 1
    cheesecake  commented on Nov. 6, 2015, 4:12 p.m.

    Just as a heads up, system testing will still be happening for P4, 5 and 6. So make sure you have the correct complexity and considered all cases!

  • 5
    bobhob314  commented on Oct. 14, 2015, 5:41 p.m.

    What happened to Guanzhong I miss him