Hello, welcome to a Christmas Carol Contest (CCC)! Here are the parameters of the contest:

• Contestants may not consult the Internet outside of accessing the relevant parts of the contest via the TSSOJ platform or consulting language documentation, and contestants may not use any prewritten code.
• Contest duration: 75 minutes.
• Number of problems: 5, with subtasks.
• Not Rated.
• No submission limit.
• Problem setters for this contest: David, RayZhang

Clarification requests for the contest must be routed through the clarification system provided on TSSOJ, and in IOI format. Note that, in particular, clarification requests must come in the form of yes/no questions.

Any suspicious behaviour will result in being forcibly ranked at the bottom of the scoreboard.

The contest consists of 5 questions in random order of difficulty. It is highly recommended to read all of the problems. You will have 75 minutes 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 75 minutes 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. 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 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++ and Java.

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.

Happy Holidays!