44 lines
791 B
Markdown
44 lines
791 B
Markdown
## Letter Combinations of a Phone Number
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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**.
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A mapping of digit to letters (just like on the telephone buttons) is given below. Note that 1 does not map to any letters.
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<p align="left">
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<img src="../../assets/Telephone-keypad2.png" alt="telefone keypad">
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</p>
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### Examples
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**Example 1:**
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```text
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Input: digits = "23"
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Output: ["ad","ae","af","bd","be","bf","cd","ce","cf"]
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```
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**Example 2:**
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```text
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Input: digits = ""
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Output: []
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```
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**Example 3:**
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```text
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Input: digits = "2"
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Output: ["a","b","c"]
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```
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### Constraints
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- `0 <= digits.length <= 4`
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- `digits[i] is a digit in the range ['2', '9'].`
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---
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### Notes
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- N/A
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