## O(n) Rotational Cipher in Python

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O(n) Rotational Cipher in Python

Rotational Cipher: One simple way to encrypt a string is to “rotate” every alphanumeric character by a certain amount. Rotating a character means replacing it with another character that is a certain number of steps away in normal alphabetic or numerical order. For example, if the string “Zebra-493?” is rotated 3 places, the resulting string is “Cheud-726?”. Every alphabetic character is replaced with the character 3 letters higher (wrapping around from Z to A), and every numeric character replaced with the character 3 digits higher (wrapping around from 9 to 0). Note that the non-alphanumeric characters remain unchanged. Given a string and a rotation factor, return an encrypted string.

# Signature

string rotationalCipher(string input, int rotationFactor)

# Input

1 <= |input| <= 1,000,000 0 <= rotationFactor <= 1,000,000

# Output

Return the result of rotating input a number of times equal to rotationFactor.

# Example 1

input = Zebra-493?

rotationFactor = 3

output = Cheud-726?

# Example 2

input = abcdefghijklmNOPQRSTUVWXYZ0123456789

rotationFactor = 39

output = nopqrstuvwxyzABCDEFGHIJKLM9012345678

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O(n) Solution in Python:

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Test 1:

PS C:\dev\scripts> .\test_rotational_cipher_python.py
Length Dic Numbers : 10
Length Dic lowercase : 26
Length Dic uppercase : 26
Input: Zebra-493?
Output: Cheud-726?

Test2:

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PS C:\dev\scripts> .\test_rotational_cipher_python.py
Length Dic Numbers : 10
Length Dic lowercase : 26
Length Dic uppercase : 26
Input: abcdefghijklmNOPQRSTUVWXYZ0123456789
Output: nopqrstuvwxyzABCDEFGHIJKLM9012345678

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