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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.
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Example 1
input = Zebra-493?
rotationFactor = 3
output = Cheud-726?
Example 2
input = abcdefghijklmNOPQRSTUVWXYZ0123456789
rotationFactor = 39
output = nopqrstuvwxyzABCDEFGHIJKLM9012345678
O(n) Solution in Python:
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:
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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- Patterns of Enterprise Application Architecture
- Computer Systems - A Programmer's Perspective
- Agile Principles, Patterns, and Practices in C# by Robert C. Martin
- Growing Object-Oriented Software, Guided by Tests
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- The Tao of Programming
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- Writing Solid Code by Steve Maguire
- Philip and Alex's Guide to Web Publishing
- Object-Oriented Analysis and Design with Applications by Grady Booch
- Effective Java by Joshua Bloch
- Computability by N. J. Cutland
- Masterminds of Programming
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- The Art of Deception by Kevin Mitnick
- The Career Programmer: Guerilla Tactics for an Imperfect World by Christopher Duncan
- Paradigms of Artificial Intelligence Programming: Case studies in Common Lisp
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