How to solve with this kind of study problem

Правка en1, от 0x0002, 2023-10-12 13:38:02

I think I am ok with algorithm problems, but I am so bad in problems like greedy, constructive problems, interactive problems. The problem A, B and C in div2 are often problems like that. I often can't find the key observation. How to practise? Just doing more problems like that or something else?

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en1 Английский 0x0002 2023-10-12 13:38:02 342 Initial revision (published)