Could you please tell me the topics I need to study for solving DIV2C and DIV2D problems on Codeforces? I have observed that DIV 2C doesn't require any special algorithm or data structure, as it involves basic paradigms like greedy,dp,two pointer,binary search etc with a bit of twist. But what about DIV 2D? Since I am currently focusing on DIV2 A,B,C,D only, please provide me the exhaustive list of topics for problems till DIV 2D. Since many of you have a lot of experience so please guide me with what you observed. Thank you.
According to my observation:
Can you suggest how to master the maths problem of div2 d such as
https://mirror.codeforces.com/contest/1658/problem/D1 https://mirror.codeforces.com/contest/1673/problem/D https://mirror.codeforces.com/contest/1831/problem/D and many more.
I thought these need a lot of observation. How much time does it tack to come up?