Hi, I am sending my greetings to you, I find problem D in the last round is really hard and I can't reach for a solution, I have read the tutorial but still don't get the solution, for some reason this situation makes me feel annoyed I don't feel good until I get the solution and this situation happens a lot with me, I guess you might know exactly what I am talking about, so if you solved the problem I would appreciate if you share your solution, thanks in advance.