What is the most important topics that i have to focus on to reach expert?
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I don't know but lately it seems like codeforces likes to give out math and dynamic programming topics.
Thank you for your advice :)
Greedy algorithm and binary search.
Thank you for your advice :)
Particularly DFS/BFS, bin search, dp, data structures, greedy and of course math. It is obvious that math here is the most important.
Thank your for your help :)
You can do some DP problems,and you need to improve your math skill too.
Basic data structures.
Thank you for your help :)