Letter Combinations of a Phone Number
Explore how to solve the letter combinations of a phone number problem by applying subset patterns. Understand digit-to-letter mappings on a phone keypad and learn to generate all possible combinations for input strings ranging from 2 to 9. This lesson helps you implement and test solutions in a hands-on environment.
We'll cover the following...
We'll cover the following...
Statement
Given a string containing digits from 2 to 9 inclusive, with the possibility of each digit appearing multiple times, return all possible letter combinations that the number could represent. Return the answer in any order.
The illustration below shows the mapping of digits to letters in a telephone dial pad.
Note: The number on the telephone dial pad does ...