Okay, so I again came up with a similar String question and I don't know how to approach these questions(Optimally), I with be thankful for the explanations if any..

Question Given a sentence string with no spaces in between, find the minimum number of spaces that can be there in the string so that all the generated words are present in a given dictionary. Example:

string: abcdef no.of words in dictionary: 5 dictionary: a bc def ab abc

Answer: 1 Explanation : By inserting 1 space as shown — 'abc def' we get 2 words abc and def which are valid words in the language Note: You could also split it as 'a bc def' But this would not be the case with minimum number of spaces.

I will be Thankful to the helping responses.