[?*] Letter combinations of a Phone number

Source: Internet
Author: User

Given a digit string, return all possible letter combinations, the number could represent.

A mapping of Digit to letters (just as on the telephone buttons) is given below.

Input:digit string "Output": ["ad", "AE", "AF", "BD", "Be", "BF", "CD", "CE", "CF"].
1    Public classSolution {2          Public StaticList<string>lettercombinations (String digits) {3String digitletter[] = {"", "", "abc", "Def", "Ghi", "JKL", "MnO", "PQRS", "TUV", "WXYZ"};4list<string> result =NewArraylist<string>();5 6             if(Digits.length () ==0)returnresult;7 8Result.add ("");9              for(inti=0; I<digits.length (); i++) Tenresult = Combine (Digitletter[digits.charat (i)-' 0 '],result); One  A             returnresult; -         } -  the          Public StaticList<string> Combine (String digit, list<string>list) { -list<string> result =NewArraylist<string>(); -  -              for(inti=0; I<digit.length (); i++)  +                  for(String x:list) -Result.add (x+Digit.charat (i)); +  A             returnresult; at         } -}

[?*] Letter combinations of a Phone number

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