DIY: Decode Ways
Explore how to implement a function that returns the number of valid ways to decode a numeric string into letters based on a mapping from 1 to 26. Understand edge cases, handling of zeros, and multiple grouping possibilities to prepare for coding interviews. This lesson helps in mastering decoding logic applicable to encryption and data validation challenges.
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 ...