Many times I really stuck on a simple div 2 a level problem. I am approcahing it but not on the right way. I am building such a logic that is not related to it and I can not feel it. I am thinking it should be accepted and also on b level problem many times I can not build the logic if I do after the contest I saw that It was not the approach..what should I do..should I solve atcoder problem to get rid up to it ?? or cses or cf a,b level.??.also some times after watching the tuitorial I understand really well but after few days/month I can not remember the approach for implement it to another problem..after solving a significant amount of problem (almost 700).nothing changed.feels like good for nothing..plz give some advice/suggestion