The CodeChef July LunchTime begins soon and I am the editorialist for the whole problem set.
The problems are really good and if you decide to take part in it, you won't regret it for sure!
As a quick tip, I can tell you that 3 problems are very cool ad-hook ones - they do not require any specific knowledge, just thinking and coding. The last problem is a math related challenge
After the contests I will post the most liked editorial here.