Hello everybody,

I'm trying to improve my level on codeforces, so I always try to solve hard problems for me

like C and D Div2 but in 95% I can't solve them my self so I read the tutorials and I

feel that I'm still in the same place after solving good number of C and D problems and I am still

not able to solve C in most cases.

I should tell you that I am practicing alone and I have no coach and just depending on

the web to learn.

So I will be thankful if you tell me how to practice and if there are any resources that I have to learn from?

Thanks.