Golang | Leetcode Golang题解之第17题电话号码的字母组合
题目：
题解：
var phoneMap map[string]string = map[string]string{"2": "abc","3": "def","4": "ghi","5": "jkl","6": "mno","7": "pqrs","8": "tuv","9": "wxyz",
}var combinations []stringfunc letterCombinations(digits string) []string {if len(digits) == 0 {return []string{}}combinations = []string{}backtrack(digits, 0, "")return combinations
}func backtrack(digits string, index int, combination string) {if index == len(digits) {combinations = append(combinations, combination)} else {digit := string(digits[index])letters := phoneMap[digit]lettersCount := len(letters)for i := 0; i < lettersCount; i++ {backtrack(digits, index + 1, combination + string(letters[i]))}}
}