DMOPC '19 April Contest

Welcome to the seventh DMOJ Monthly Open Programming Competition of the 2019-2020 season!

The problem writers this time are george_chen, KevinWan, Tzak, little_prince, richardzhang, Kirito, and AvaLovelace.

Please note that this contest will be full feedback.

This round will be rated for all participants.

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

This contest will consist of 7 main problems, the difficulty of which may range anywhere from CCC Junior to CCO level.

This contest will feature a 8-th problem (Problem 0) for students who are just getting started with programming.

Some problems offer partial marks in the form of subtasks. If you cannot solve a problem fully, we encourage you to go for these partial marks.

You will have 4 hours to complete the contest. After the contest window begins, you may begin at any time. Once you enter the contest, your personal timer will start counting down and you will be able to submit until 4 hours from when you started, or until the hard deadline (23:59:00 EDT of May 6th), 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:

  • Ties will be broken by the last submission time that increased your score plus penalties. The first submission time of your highest score will be used.
  • Each non-AC (excluding Compiler Errors) submission will incur a penalty of 5 minutes.
  • It is not guaranteed that the problems will be in order of increasing difficulty. Reading all of the statements is recommended.
  • 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++.

Clarification requests for the contest must be routed through the clarification system provided on DMOJ, and not through other channels including but not limited to Slack and Discord.

Due to rampant issues with cheating on contests that has happened recently, any suspicious behavior during the contest window may result in your rating being impacted negatively. Such behavior includes, but is not limited to:

  • Registering for the contest with at least two accounts.
  • Participating in the contest with an account that is not your primary account.
  • During the contest window, talking about the contest in more detail than answering a yes/no question about whether one participated in the contest. This includes, but is not limited to, posting spoilers about the contest and public speculation of the contest.
  • Attempting to exploit bugs in the platform to subvert the constraints of the contest.

Punishments may include performance being unrated or, for more serious infractions, being forcibly ranked at the bottom of the scoreboard.

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.

Problems

Problem Points AC Rate Users Editorials
DMOPC '19 Contest 7 P0 - Contest Feedback 3 48.7% 396 Editorial
DMOPC '19 Contest 7 P1 - Hydrocarbons 7 45.1% 269 Editorial
DMOPC '19 Contest 7 P2 - Dinner Party 10 18.7% 146 Editorial
DMOPC '19 Contest 7 P3 - Tree Pruning 12p 21.6% 145 Editorial
DMOPC '19 Contest 7 P4 - Bob and Continued Fractions 20p 20.8% 113 Editorial
DMOPC '19 Contest 7 P5 - Soriya's Programming Project 20p 17.8% 126 Editorial
DMOPC '19 Contest 7 P6 - Bob Equilibrium 30p 18.9% 59
DMOPC '19 Contest 7 P7 - Fluid Dynamics 35p 15.6% 15

Comments


  • 2
    rocww  commented on May 8, 2020, 2:45 a.m. ← edited

    Hello, I am new to the platform. Any rating update as the contest is over.


    • 5
      richardzhang  commented on May 8, 2020, 7:57 a.m.

      Yes, there will be rating changes. It will take a few days (3~4 days), though, as we have to check for suspicious submissions or cheating.


      • 2
        luismo  commented on May 8, 2020, 10:05 p.m.

        3~4 days from today?


  • 11
    eggag32  commented on May 7, 2020, 3:33 p.m.

    Wow, the solution to P2 is so cool!


  • 4
    Kirito  commented on May 2, 2020, 8:58 p.m. ← edit 3

    The administrative staff responsible for this contest are Kirito and richardzhang. If you have any questions or appeals regarding the contest, please contact us either by email, or on the DMOJ Discord. Inquiries made via other platforms may be ignored.


  • 4
    Kirito  commented on May 1, 2020, 12:31 a.m.

    After receiving feedback from the testers, we were not satisfied with holding the contest in its current form. We have decided to delay the contest to Monday to make improvements. We have decided to increase the number of problems to 7 (not including P0), and increase the duration by an hour.