Compiler settings

We use crystal 1.18.2 to compile your program with the following command:

$ crystal build {mainfile} -O 2 -o {executable} --no-color

• {mainfile} is the entrypoint file (you can specify which file this is when submitting).
• {executable} is the compiled executable.

File extensions

Files with any of the following file extensions will be used: .cr

Additional information

Additional language-specific advice and information for many languages is available in the knowledge base