Sorry to bother you with an annoying question! I have been practicing question at 1500 rating range and i encounter many ad-hoc, greedy problems. Many a times i spend hours(at most 2 btw) on a question and i am not able to solve it.Since the question was greedy i sometimes feel i wasted a lot of time as i am not sure if i'll ever get to use what i learnt in the question again. So i am in dilemma if i should practice questions topicwise like from CSES or continue my current strategy of solving around 30-35 questions of each rating or until i feel comfortable in that range. Also should i go on a limb and do like 100 div D problems to try to get to expert in a month since i almost have a month long break from uni? Also things like number of questions doesn't matter and other things i feel don't work on me and i think having a disciplined approach like solving a certain number of questions like a task would be more helpful.