phone_number_letter
phone_number_letter.go 源码
package main
//电话号码的字母组合
var letters = map[byte]string{
'2': "abc", '3': "def", '4': "ghi", '5': "jkl",
'6': "mno", '7': "pqrs", '8': "tuv", '9': "wxyz",
}
func letterCombinations(digits string) []string {
var res []string
if digits == "" {
return res
}
letterHelper(0, digits, "", &res)
return res
}
func letterHelper(i int, digits string, cur string, res *[]string) {
if i == len(digits) {
*res = append(*res, cur[:])
return
}
for _, v := range letters[digits[i]] {
cur += string(v)
letterHelper(i+1, digits, cur, res)
cur = cur[:len(cur)-1]
}
}
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