Pointer Exercise in C$++$:

In this exercise, you will be given a key and a message encrypted using Vigen$$re Encryption. Your goal is to decrypt this message with the given key.

Input format:

Key size

Key chars $($decimals representing ascii values$)$

Message size

Message chars $($decimals representing ascii values$)$

Notes:

All chars in key will only be lowercase alphabets

In char array $($char$[]),$ there must be a $\backslash 0$ at the end $($ascii $=0)$

The problem already added $\backslash 0$ at the end of key and message

How does Vigen$$re Encryption work?

Message: This is an example case.

Key: example

What about Decryption? Just change $+$ to $-$

Here's the example:

You can refer to this code template as attached below:

The txt file is as provided below:

$5$

$1001011091110$

$136$

$9494943270115122117117101102105111101102119114114101333294949410$

$7711412132981111181193210211810432104113971144610$

$84120115100119113329810011311332109114121100321161081121133211911332120116115321051151009710012032971163211812010311410411411287719580778049494610211698443210$

$1111131043210110510111311710432108120321029932725144321201161111131111013258410$

Reminder: code in C$++$ only.