DMOPC '15 April Contest

Welcome to the seventh Don Mills Open Programming Competition of the 2015-2016 season!

The problem writers this time are WallE256, Phoenix1369, cheesecake, Xyene and FatalEagle.

If this is your first time participating in the DMOPC this season, you can learn about our new system here.

This round will be rated for all participants.

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.

Good luck!


  • 2
    cjoa  commented on April 12, 2016, 7:10 p.m. edited

    One of my students is having troubles registering a new account in DMOJ. The site shows an empty red message box when he attempts to register. I was able to reproduce this as well. Is user registration blocked at this time? Could an admin from DMOJ take a look at this problem?

    UPD: Problem solved. It looks like the registration process is validating usernames and email addresses. After eliminating a dot in the email address username, we were able to register the account.

  • 6
    cjoa  commented on April 10, 2016, 11:14 a.m.

    Is it possible to extend the hard deadline of the April DMOPC until 11:59:59pm EST? I have several students who would like to participate in this contest, but they are not available until late in the evening.

    • 6
      cheesecake  commented on April 10, 2016, 10:14 p.m.

      Since this may very well be the last DMOPC of the season, we will make an exception. The virtual contest window has been extended to midnight.

    • 1
      bobhob314  commented on April 10, 2016, 5:44 p.m.

      I second this motion.