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29 lines
617 B
29 lines
617 B
17. Letter Combinations of a Phone Number
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Medium
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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.
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A mapping of digits to letters (just like on the telephone buttons) is given below. Note that 1 does not map to any letters.
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Example 1:
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Input: digits = "23"
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Output: ["ad","ae","af","bd","be","bf","cd","ce","cf"]
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Example 2:
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Input: digits = ""
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Output: []
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Example 3:
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Input: digits = "2"
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Output: ["a","b","c"]
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Constraints:
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0 <= digits.length <= 4
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digits[i] is a digit in the range ['2', '9'].
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