Can anyone tell me where to read about such type of questions

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Can anyone tell me where to read about such type of questions.
Number of ways to divide string in sub-strings such to make them in lexicographically increasing sequence

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Is anyone here?

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Hello guys, please help me.

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See for these type of questions u must know dynamic programming .

There are many resources , u have to google it (google Combinatorials and DP) , also go to youtube search for DP lectures , but before that please practice more problems on recursion and basic things

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you can practice que from this link, before that as @ssrivastava990 said please practice more problems on recursion and basic DP.

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can we use above concept to solve this problem.

If yes, how ?