There's a major issue that needs to be discussed. CF problem setters need to understand that maximum people here are green or grey. They give contests mostly for the sake of learning, and not for competing. So why can't you give tasks based on some standard algorithm? I understand this will make the questions easier for experienced contestants, but giving questions on only ad hoc and greedy isn't doing any good either (I am talking about A, B, C). Please take your time to make good problem sets. Or otherwise, I am sure majority of newcomers will shift to something like leetcode, hackerrank, for CPing.