Mock CCC '21 Senior

Hello, welcome to a mock CCC! Here are the parameters of the contest:

  • Contest duration: 3 hours.
  • Number of problems: 5, full feedback. Each problem will be worth 15 marks.
  • Not rated.
  • Scoreboard will be hidden.
  • Contest format: IOI.
  • Number of submissions allowed per problem: 50.
  • Checkers for problems: Unless otherwise specified, identical. The contest will follow the standard convention of having all lines terminate in a \n character.
  • Testers for this contest: None.

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 or Discord. 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.

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

The contest consists of 5 questions with a range of difficulty from CCC Senior 1 to CCC Senior 5. It is highly recommended to read all of the problems. 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, 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.
  • Remove all extra debugging code and/or input prompts from your code before submitting. The judge is strict — your output must match the judge output 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 our staff is final.


  • 14
    JohnstonLiu  commented on Feb. 8, 2021, 9:19 p.m.

    I don't know how to read problems.

    • 5
      gary050613  commented on Feb. 9, 2021, 6:18 p.m.

      Yeah, lol these problem descriptions are questionable compared to the CCC ones.

    • 1
      Chrislojet  commented on Feb. 9, 2021, 3:29 p.m.

      Me too, kid.

  • -33
    WAO  commented on Feb. 3, 2021, 11:43 a.m.

    This comment is hidden due to too much negative feedback. Click here to view it.

    • -13
      d3story  commented on Feb. 5, 2021, 9:54 p.m.

      This comment is hidden due to too much negative feedback. Click here to view it.

      • 1
        WAO  commented on Feb. 8, 2021, 5:40 p.m.

        No hate, but this comment coming from someone who took well over 6 bad attempts to solve a simple HASH for CCC 2020 S3 is somewhat ironic. Dude, just wondering did you solve anything past senior 3?

        • 1
          vichua2006  commented on Feb. 10, 2021, 9:30 a.m.

          me who took well over 20 submissions to AC CCC 20 J5 with python: :/

          • 0
            WAO  commented on Feb. 10, 2021, 9:42 a.m.

            its ok bro, hold your head up king 👑

        • -1
          rexn  commented on Feb. 8, 2021, 5:48 p.m. edit 13


    • 13
      rexn  commented on Feb. 3, 2021, 2:00 p.m.


      • -3
        WAO  commented on Feb. 8, 2021, 5:47 p.m. edit 3

        i love u

  • 5
    Play_Erphil  commented on Feb. 2, 2021, 10:42 p.m. edited

    So, we have to wait until the contest is done to start upsolving right? Nevermind, if I spectate I can submit