Hello everyone, I am quite new over here as you can see... and when I look at some of your codes, they look much different than me. Of course, the logic is the same(Okay, sometimes totally different) but they have some different way of writing it. So if some of you guys out there who can suggest a source to achieve that kind of format, that would be nice. My style of coding is very sloppy and sometimes I am unable to see what I have done.

Also, I find it quite difficult to do Div. 2 problems I am only able to do 1 or 2, and sometimes to my surprise...none. So I think that it is useless for me to directly jump into the competition. So for me, what are the things that I should cover. For example, Some of the problems require a strong grip on some of the crucial concepts of maths and algorithms. So can some of you suggest a source (For example A Book, Or Videos, Or... whatever you know) where I can learn the things and all important concepts required for competitive coding.