I don't know whether many others encountered with this problem or not, but for me at least, I notice that the official tutorials made for the contests aren't clear or easy to understand enough, although they are written to help and improve the beginners in the first place, they do not really stand for that, with all respect to the writers , sometimes I notice that the writer jumps from point n to n+2 and the reader has to guess the missing points on his own, sometimes the tutorials are written in a rigorous mathematical language rather than friendly one, sometimes the statements aren't clear enough, and sometimes the tutorials are written assuming that the reader has the sufficient knowledge to understand the math and logic behind the problem, I'm wondering, how is that supposed to help the beginners or the newcomers ?