/*
17. Letter Combinations of a Phone Number
Given a digit string, return all possible letter combinations that the number could represent.
A mapping of digit to letters (just like on the telephone buttons) is given below.
Input:Digit string "23"
Output: ["ad", "ae", "af", "bd", "be", "bf", "cd", "ce", "cf"].
*/
import Foundation
func letterCombinations(_ digits: String) -> [String] {
let length = digits.lengthOfBytes(using: .ascii)
guard length > 0 else {
return [String]()
}
//0~9
let matchArray: [String] = ["", "", "abc", "def", "ghi", "jkl", "mno", "pqrs", "tuv", "wxyz"]
//Error：需要先有一个初始值 ""
var res: [String] = [""]
let intArray: [Int] = digits.characters.map {
Int(String($0))!
}
for i in intArray {
var tempRes: [String] = [String]()
for value in matchArray[i].characters {
for valueR in res {
let ret = "\(valueR)\(value)"
tempRes.append(ret)
}
}
res = tempRes
}
return res
}
print(letterCombinations("23"))
17. Letter Combinations of a Phone Number
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