17 Letter Combinations of a Phone Number
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class Solution {public: vector<string> letterCombinations(string digits) { vector<string> ans; if(digits==""){ return ans; } string combination=""; dfs(ans,combination,digits); return ans; } void dfs(vector<string> &ans,string combination,string digits){ if(digits==""){ ans.push_back(combination); return; } string button=buttons[digits[0]-'0']; digits.erase(digits.begin()); for(auto c:button){ dfs(ans,combination+c,digits); } }private: const string buttons[10]={" ","","abc","def","ghi","jkl","mno","pqrs","tuv","wxyz"};}; 0 0
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