DIY: Decode Ways
Explore how to determine the number of ways to decode a digit string into letters using Ruby. This lesson helps you implement a function that handles different valid encodings, preparing you for coding interviews focused on string manipulation and dynamic programming.
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 ...