didi labs 기출 문제

[LeetCode - DiDi Labs 기출 문제] 17. Letter Combinations of a Phone Number

17. Letter Combinations of a Phone Number Medium 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",..