Mehta and charming strings

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After finishing his work for the day, Mehta started examining some strings for fun. While doing this, he figured out that the charming value of a substring is directly proportional to the length of the substring provided that the length of the substring doesn't exceed a particular value otherwise that substring is considered repulsive. Since Mehta is very fond of palindromes, he wants to compute

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solution.cppC++17

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