Chef Encryption

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The world of the internet is growing day by day and thread for sharing the confidential data increases. Chef wants to send a file to his friend John. Chef is very intelligent, he designed an algorithm which generates the FPEC (File Protection Encrypted Code) for the given input $S$, Chef sends the file along with FPEC code to his friend John. John needs to Decrypt the FPEC to obtain the passcode

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solution.cppC++17

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