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class Solution { | |
private: | |
vector<string> strDic = {"", "", "abc", "def", "ghi","jkl", "mno","pqrs", "tuv", "wxyz"}; | |
vector<string> finalVec; | |
public: | |
vector<string> letterCombinations(string digits) { | |
int len_d = digits.length(); | |
for(int i = 0; i < len_d; i++){ | |
int index = digits[i] - '0'; | |
finalVec = multiStr(finalVec, getList(strDic[index])); | |
} | |
return finalVec; | |
} | |
vector<string> getList(string &a){ | |
vector<string> ans; | |
for(int i = 0; i< a.length(); i++){ | |
string temp = ""; | |
temp = temp + a[i]; | |
ans.push_back(temp); | |
} | |
return ans; | |
} | |
vector<string> multiStr(vector<string> &l1, vector<string> l2){ | |
if(l1.size() == 0 && l2.size() != 0){ | |
return l2; | |
} | |
if(l1.size() != 0 && l2.size() == 0){ | |
return l1; | |
} | |
vector<string> ans; | |
for(int i = 0; i< l1.size(); i++){ | |
for(int j = 0; j < l2.size(); j++){ | |
ans.push_back(l1[i]+l2[j]); | |
} | |
} | |
return ans; | |
} | |
}; |
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