Question: Write a C++ Program to implement decryption of a Poly Alphabetic Substitution Cipher. The program should read the decrypted message from a .txt file on

Write a C++ Program to implement decryption of a Poly Alphabetic Substitution Cipher. The program should read the decrypted message from a .txt file on the desktop and print out the decrypted message on a .txt file on the desktop. I need a little explanation on the code

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