Letter Combinations of a Phone Number
Medium
Topics
Given a string of digits from 2-9, return all letter combinations the number could spell (phone keypad mapping). Return an empty result for an empty input. Order does not matter.
Example 1
Input: digits = "23" Output: ["ad","ae","af","bd","be","bf","cd","ce","cf"]
Example 2
Input: digits = "" Output: []
Constraints
- 0 <= digits.length <= 4
- digits[i] is in the range 2-9.
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