DIY: Decode Ways
Understand how to decode a numeric string that represents letters from A to Z using given mappings. Learn to count all valid decoding combinations, handle edge cases like leading zeros, and implement a solution function for 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 ...