How can I attack problems like,"minimum number of operations to sort an array or permutation", Can anyone give me some lists of problems?
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just fucking practice random problems
Solving random problems is not so efficient imo.
Solving a batch of problems on the same topic (and finding common ideas / techniques) may be much more insightful than solving those problems several weeks / months apart. In the latter case, it's more frequent to end up not solving a problem, reading the editorial and realizing that the you'd encountered the necessary idea a lot of times before, but you didn't remember it.
I'm interested in other opinions, though. How do you usually practice and is it effective?
I mean I think it's useful to solve a lots of dp problems or graph problems specifically sometimes.But should things be that specific like — "Minimum number of operations to sort an array type problems"??
It's still better than solving random problems. I also think that topic is not too specific (there are a lot of problems like that).
https://atcoder.jp/contests/arc132/editorial/3200