leetcode: Letter Combinations of a Phone Number
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还是回溯
class Solution {public: vector<string> letterCombinations(string digits) { if(digits == "") return vector<string>(1,""); vector< string> res; core( digits, res, "", 0); return res; } void core( const string &digits, vector< string> &res, string str, int pos){ if( pos == digits.size()){ res.push_back(str); return; } const static string letter[10] = {"","","abc","def","ghi","jkl","mno","qprs","tuv","wxyz"}; for( int i = 0; i < letter[digits[pos]-'0'].size(); ++i){ core( digits, res, str+letter[digits[pos]-'0'][i], pos+1); } }}; 0 0
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