100-days-of-rust/Week-02/Day-08_Letter-Combinations-Of-A-Phone-Number/README.md
2023-03-23 20:52:21 -04:00

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