Pari and String

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Pari appeared for a job interview and is asked the following question. Arrange all the distinct substrings of a given string in lexicographical order and concatenate them. Print the Kth character of the concatenated string. It is assured that given value of K will be valid i.e. there will be a Kth character. Can you help Pari out with this? Note We have distinct substrings here, i.e. if string is

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solution.cppC++17

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