DIY: Decode Ways
Explore how to decode strings of digits into corresponding letters using defined mappings from 1 to 26. Understand the constraints on valid groupings and implement a function to return the number of possible decodings. This lesson helps develop problem-solving skills applicable to coding interviews focused on string and dynamic programming 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 ...