DIY: Decode Ways
Explore the Decode Ways problem in cyber security which involves decoding digit strings into letters using a specific mapping. Learn to implement a function that calculates the number of valid ways to decode a message, understanding key constraints like invalid leading zeros. This lesson builds skills in cryptography and message integrity relevant to coding interviews.
We'll cover the following...
We'll cover the following...
Problem statement
A message containing the letters from A-Z can be encoded into a string of numbers, using the following mapping:
'A' -> "1"
'B' -> "2"
...
'Z' -> "26"
To decode an encoded message, all the digits must be grouped and then mapped back into letters, using the reverse of the mapping ...