Welcome to the first Lyon's Computing Competition (LCC) of the 2024-25 school year! This month's theme is on Halloween! 🎃

Before writing this contest, you may wish to check out the faq and tips pages. After joining the contest, proceed to the Problems tab to begin. You can also head to Users if you wish to see the rankings.

Contest Parameters

Listed below is some advice for contests:

• 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++, Java, and Python.
• Python users are highly recommended to use PyPy 2/3 over Python 2/3 when submitting.
• Read carefully, and try to attempt all the problems. Some problems offer partial marks in the form of subtasks, solve these for those extra points!