Pros:

• This website is simple yet it is somehow hailed to be one of the best avenue for competitive programming. There's a lot of contest that a participant can choose from challenge/hack the program of the other contestant, educational contest etc.

• It is an active community for the programmers, though there's no prize usually for the contest that has been running the bragging rights and prestige that it gives to the participants give them an edge to others.

Cons:

• The site is purely for programmers only, if you are not familiar with the terms and how it works this site should be avoided ( kidding)