The mainclass is the class containing the entry point (main method) of your program. It is a method that looks like this:
public static void main(String[] args)
As you can submit multiple classes, there can potentially be multiple such methods. Therefore you need to specify which class contains the main method we should use. Note that the mainclass must contain the full name of the class. If you declare a package, it must be included (or we will not find your class). For example, if your class name is "Solution" and it is in package "fuzzy" your mainclass should be "fuzzy.Solution".
Specifying the wrong mainclass will give you a Compile Error telling you what happened.
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