The Captured Raven

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Cersei Lanister has sent a raven to her ally King just as Rob Stark is marching towards King's Landing. Rob's army has managed to capture the raven but they were not able to understand the message. As advisor to the *King in the North* you have to help the army by decrypting the message! The message is in the form of a string $S$ of the format $number[S]$. Some of your fellows recognize this en

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solution.cppC++17

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