Hello Codeforces,

I have a question regarding how to practice Div2 C & D problems. In the most recent Div2 Contest, I was able to solve all of the problems (harder problems such as E & F) except for C & D, and in prior contests I would be unable to solve these problems.I know the issue isn't a matter of how much I practice, as shown by my performance in the contest, but what exactly I'm practicing.

Any tips on how to prepare for these types of problems would be greatly appreciated, as I'm really struggling with these types of problems.

Sincerely, wet_water