Monoon and strings

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Little Monoon solved an easy problem during a contest. His friend **Hersh Magguwani** on the other hand couldn't solve it. After the contest he gave Monoon an excuse that he misunderstood the question and was thus solving a harder version of it. He challenges him to solve the harder version of the problem. Given a string $s$ of length $n$ as input, calculate the number of different strings of len

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solution.cppC++17

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