CPC '21 Contest 1

Welcome to the first Competitive Programming Contest (CPC) of 2021!

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

You will have 3 hours to complete the contest. After the contest window begins (at 00:00:00 EDT of July 24th), 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 3 hours from when you started, or until the hard deadline (00:00:00 EDT of July 27th), 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.

Here are some additional parameters of the contest:

  • The difficulty of the problems 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.
  • The score distribution for the problems will be 30 points for P0, and 100 points for the other problems.
  • Problems will be approximately increasing in difficulty, but reading all of the statements is still recommended.
  • Checkers: unless otherwise specified, standard. The contest will follow the standard convention of having all lines terminate in a \n character, with no trailing whitespace.
  • It is guaranteed that all the problems will be solvable with C++.

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

  • 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.
  • Python users are recommended to try both PyPy 2/3 and Python 2/3 when submitting.

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 Discord and Slack. Furthermore, all clarification requests will be handled the way they normally are in IOI. Note that, in particular, clarification requests must come in the form of yes/no questions.

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:

  • Divulging the contents of the scoreboard to participants who have not finished their window.
  • 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
CPC '21 Contest 1 P0 - AQT and Alphabet 3 68.7% 388 Editorial
CPC '21 Contest 1 P1 - AQT and Fractions 5p 16.2% 252 Editorial
CPC '21 Contest 1 P2 - AQT and Multiset 7p 23.3% 168 Editorial
CPC '21 Contest 1 P3 - AQT and Circles 10p 13.6% 107 Editorial
CPC '21 Contest 1 P4 - AQT and Directed Graph 12p 30.5% 265 Editorial
CPC '21 Contest 1 P5 - AQT and Modern Art 15p 15.8% 45 Editorial
CPC '21 Contest 1 P6 - AQT's Break Time is Over 20p 7.2% 26 Editorial
CPC '21 Contest 1 P7 - AQT and Quarantine 20p 16.2% 17 Editorial

Comments


  • 0
    andy_zhu23  commented on Aug. 5, 2021, 12:58 a.m.

    Do any of you guys know what happened to P2?


    • 4
      vishnus  commented on Aug. 5, 2021, 1:36 a.m.

      I believe the data was weak and the problem could have been "cheesed", so the data is being updated.


  • 3
    justin_g_20  commented on July 27, 2021, 6:47 a.m.

    Will editorials be made available?


    • 2
      Plasmatic  commented on July 27, 2021, 3:47 p.m.

      yes


  • 4
    Viv_CCGS  commented on July 26, 2021, 8:38 a.m.

    Do the points you earn in the contest affect your points on DMOJ?


    • 6
      justin_g_20  commented on July 26, 2021, 10:21 a.m.

      Yes, they do, at the end of the contest. They affect your dmoj points as at the end, they become normal problems and are weighted based upon their difficulty.


      • 1
        Viv_CCGS  commented on July 29, 2021, 11:30 a.m.

        Thanks!


  • 9
    Riolku  commented on July 25, 2021, 3:52 a.m.

    The contest has been extended one day.


  • 9
    Kirito  commented on July 24, 2021, 6:15 p.m. ← edited

    The judges are currently down due to a prolonged power outage. Anyone whose contest window was affected by this can appeal to have their contest participation unrated.

    Edit: judges are back.


  • 5
    Plasmatic  commented on July 23, 2021, 6:52 p.m. ← edit 2

    The score distribution for the contest will be 30 points for P0, and 100 points for the other problems- a total of 730 points.


  • 10
    DM__Oscar  commented on July 17, 2021, 3:32 p.m.

    AQT tends to show up where you don't expect him.


  • 0
    dchoo333  commented on July 17, 2021, 2:25 a.m.

    Are all problems solvable in Python 3?


    • 7
      crackersamdjam  commented on July 17, 2021, 2:30 a.m. ← edit 2

      Don't assume anything that wasn't stated. My answer is "maybe."


      • 0
        dchoo333  commented on July 17, 2021, 1:06 p.m.

        OK. Thanks


  • -53
    AQT  commented on July 15, 2021, 1:37 p.m.

    This comment is hidden due to too much negative feedback. Show it anyway.


    • 22
      crackersamdjam  commented on July 15, 2021, 1:39 p.m.

      No, AQT is AQT.


      • 12
        piddddgy  commented on July 17, 2021, 6:47 a.m.

        No, AQT is a cutie! <3


        • 10
          X_Ray  commented on July 18, 2021, 5:46 p.m.

          A Cute T.


          • 7
            vishnus  commented on July 20, 2021, 3:32 p.m.

            A cutie


            • -9
              dxke02  commented on July 26, 2021, 2:00 a.m. ← edit 3

              This comment is hidden due to too much negative feedback. Show it anyway.


      • -76
        AQT  commented on July 15, 2021, 5:11 p.m. ← edited

        This comment is hidden due to too much negative feedback. Show it anyway.


        • 50
          bruce  commented on July 26, 2021, 8:17 p.m.

          Obviously, you underestimate how popular AQT is. Maybe you should set your first target -75, like the perfect ccc score.


        • 12
          BalintR  commented on July 26, 2021, 2:53 a.m.

          Since this has reached -30 votes, can we get 2 geo problems on ccc 2022?


          • 11
            Plasmatic  commented on July 26, 2021, 8:35 p.m.

            reach -75 and then ccc is all geo problems


            • 4
              justin_g_20  commented on Aug. 8, 2021, 5:54 a.m. ← edit 3

              It's -75 as of right now, let's get some geo problems


          • -7
            Badmode  commented on July 26, 2021, 6:02 p.m.

            This comment is hidden due to too much negative feedback. Show it anyway.


            • 8
              bariumlanthanum  commented on July 27, 2021, 1:45 p.m.

              at least you will know what to practice