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

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

Is anyone here?

Hello guys, please help me.

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

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.
https://www.codechef.com/CODG2021/problems/CODIGO04

If yes, how ?