17 Letter Combinations of a Phone Number
Code and explanation: https://www.patreon.com/posts/letter-...
Given a string containing digits from 2-9 inclusive, return all possible letter combinations that the number could represent. Return the answer in any order.
A mapping of digits to letters (just like on the telephone buttons) is given below. Note that 1 does not map to any letters.
Example 1:
Input: digits = "23"
Output: ["ad","ae","af","bd","be","bf","cd","ce","cf"]
Example 2:
Input: digits = ""
Output: []
Problem Statement link: https://leetcode.com/problems/letter-...
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