Leetcode Problem 17. Letter Combinations of a Phone Number

17. Letter Combinations of a Phone Number

Leetcode Solutions

If the input string is empty, return an empty list as there are no combinations to generate.
Create a mapping of digits to their corresponding letters.
Define a backtracking function that takes the current combination of letters and the next index of the digit to process.
- If the current combination has a length equal to the length of the input string, add it to the result list and return.
- Otherwise, iterate over the letters corresponding to the current digit.
- For each letter, add it to the current combination and call the backtracking function with the updated combination and the next index.
- After exploring with the added letter, backtrack by removing the letter from the current combination.
Call the backtracking function with an empty initial combination and index 0 to start the process.
Return the list of generated combinations.

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