#845Medium#37 in Google's list· asked at 34 companies
Letter Combinations of a Phone Number
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What we know
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"]
Constraints
- •
0 <= digits.length <= 4 - •
digits[i]is a digit in the range ['2', '9'].