Resposta a: some problems found

[Irum]

Suggestion: a. There has to be a Prerequisite section with every problem to declare the ones eligible to solve the problem. B. There has to be some rating system for the problem submitters to enhance their level with every submission, just to motivate the users.
Problem search should be made available to the users to choose problems relevant to their course/subject without browsing into all of the uploaded problems.