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Combine the Letter of Dial pad
source link: https://codeforces.com/blog/entry/116319
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Given a string containing digits from 2-9 inclusive, print all possible letter combinations that the number could represent. print 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.
for reference of letter or number check dialpad of your smartphone.
Constraints: 0 <= digits.length <= 4 digits[i] is a digit in the range ['2', '9'].
Example 1: Input: digits = "23" Output: ["ad","ae","af","bd","be","bf","cd","ce","cf"]
Example 2: Input: digits = "" Output: []
Example 3: Input: digits = "2" Output: ["a","b","c"]
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