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38 lines
650 B
38 lines
650 B
package phoneletters
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var digitToLetters = map[rune]string{
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'2': "abc",
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'3': "def",
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'4': "ghi",
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'5': "jkl",
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'6': "mno",
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'7': "pqrs",
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'8': "tuv",
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'9': "wxyz",
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}
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func letterCombinations(digits string) []string {
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if digits == "" {
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return []string{}
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}
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combos := make([]string, 0, len(digits)*4)
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rest := letterCombinations(digits[1:])
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if len(rest) == 0 {
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rest = []string{""}
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}
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letters := digitToLetters[rune(digits[0])]
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for _, letter := range letters {
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for _, r := range rest {
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combos = append(combos, string(letter)+r)
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}
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}
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return combos
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}
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func Combinations(digits string) []string {
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return letterCombinations(digits)
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}
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