Letter Combinations of a Phone Number
Explore how to generate all possible letter combinations from digit strings like those on a telephone keypad. This lesson helps you understand key coding patterns involving subsets and permutations, preparing you to solve similar problems confidently in coding interviews.
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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 ...