In Charlie and The Chocolate Factory Willy Wonka says to Mike Teevee "You're the little devil who cracked the system" what does that mean?

Here's the explanation:

http://www.thefullwiki.org/Mike_Teavee

Mike figured out how to obtain his Golden Ticket by kinda cheating and provides an explanation as to how he found it. He proves to be both scientifically and economically literate despite (or because of) his uncontrolled technology usage: he finds his Golden Ticket simply by analyzing both the Nikkei Index and the datecodes of the other ticket finds, off set by the weather that day, and then calculating the location of the next ticket, thus requiring him to purchase only a single Wonka Bar. This version of Mike does not like chocolate, and simply used the ticket hunt as an opportunity to merely test his wits, rather than out of true desire to visit the factory. His haggard father (Adam Godley), who later serves as Mike's tour chaperone, laments during the press conference about his inability to understand his son's thought processes, while bemoaning children's obsession with modern technology in general.

When the five children first enter the facility, Mike is the only one whom Wonka addresses by name, adding, "You're the little devil who cracked the system."

Mike Tv Willy Wonka