The thing I found out is that to solve any dp problem, I just need to find the recurrence relation, nothing else. How can I build my brain to be strong enough to find any dp relation? Any blog or video or advice for that, please?
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You should just open the page called "Problemset", add "dp" tag, and start solving problems shown up there in order of difficulty. If you have no ideas for about 20-30 minutes, you can check an editorial. There is no "magic" techniques on how to solve any dp problem. You can only get stronger by practicing. I recommend to check this video. There are some problems and basic techniques.