Detailed Instructions: The goal of this task is to translate questions in Catalan into English. The requirements of the translation is that: the text must be equivalent in meaning, the text must not be ambiguous, and the text must be written as a question
Q: Quina branca de la informàtica teòrica intenta classificar àmpliament els problemes computacionals per dificultat i classe de relació?
A:
What branch of theoretical computer science deals with broadly classifying computational problems by difficulty and class of relationship?