Count the number of Perfect strings

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A string is called a perfect string if it follows the following predefined rules. - A string should contain only one word. - The characters of a string are of lower case. - The length of the string is N. - The string contains exactly K different characters from the 26 lowercase alphabets. - Atleast one of its proper prefix matches with proper suffix of same length Given N and K,you have t

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solution.cppC++17

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