Welcome to the first SAC Code Challenge of the school year!

The difficulty will range from CCC Junior 1 to CCC Senior 3.

The contest organizer is Riolku.

The problem setters are maxcruickshanks and zainjamin.

Special thanks to danielz1000, DM__Oscar, Encodeous, EpicChadGamer, feliser, Nils_Emmenegger, noYou, qwertytown4life, rexn, ryanguorocket, sjay05, SuperClash, thomas_li, and wleung_bvg for testing and helping with the problems!

The contest will run from October 29th, 00:00 EDT, until November 1st, 00:00 EDT and will be themed around Halloween.

You will have a two-hour window to solve the problems.

Here are the parameters of the contest:

• Contest duration: 2 hours.
• Number of problems: 5, full feedback (you will see the results of each submission instantly). Each problem will be worth 100 points and have partial marks in the form of subtasks.
• Scoreboard will be visible.
• No incorrect submission penalty.
• There will be no submission limit.
• Ties in score will be broken by the last submission time that increased your score.
• This contest is unrated.

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

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

• Problems will be approximately increasing in difficulty. Reading all of the statements is still 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 problems and subtasks will be solvable in C++ and Java; Python users are recommended to use PyPy.