leetcode Letter Combinations of a Phone Number
2013-09-26 21:28
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Letter Combinations of a Phone NumberJan 27 '125504 / 16698
Given a digit string, return all possible letter combinations that the number could represent.
A mapping of digit to letters (just like on the telephone buttons) is given below.
Note:
Although the above answer is in lexicographical order, your answer could be in any order you want.
class Solution {
private:
map<char, vector<char> > dict;
vector<string> ret;
public:
void createDict()
{
dict.clear();
dict['2'].push_back('a');
dict['2'].push_back('b');
dict['2'].push_back('c');
dict['3'].push_back('d');
dict['3'].push_back('e');
dict['3'].push_back('f');
dict['4'].push_back('g');
dict['4'].push_back('h');
dict['4'].push_back('i');
dict['5'].push_back('j');
dict['5'].push_back('k');
dict['5'].push_back('l');
dict['6'].push_back('m');
dict['6'].push_back('n');
dict['6'].push_back('o');
dict['7'].push_back('p');
dict['7'].push_back('q');
dict['7'].push_back('r');
dict['7'].push_back('s');
dict['8'].push_back('t');
dict['8'].push_back('u');
dict['8'].push_back('v');
dict['9'].push_back('w');
dict['9'].push_back('x');
dict['9'].push_back('y');
dict['9'].push_back('z');
}
void dfs(int depth, int maxdepth, string digits, string value)
{
if(depth == maxdepth)
{
ret.push_back(value);
}
for(int i=0; i<dict[digits[depth]].size(); i++)
{
dfs(depth+1, maxdepth, digits, value+dict[digits[depth]][i]);
}
}
vector<string> letterCombinations(string digits) {
// Start typing your C/C++ solution below
// DO NOT write int main() function
createDict();
ret.clear();
string temp;
dfs(0, digits.size(), digits, temp);
return ret;
}
};
Given a digit string, return all possible letter combinations that the number could represent.
A mapping of digit to letters (just like on the telephone buttons) is given below.
Input:Digit string "23" Output: ["ad", "ae", "af", "bd", "be", "bf", "cd", "ce", "cf"].
Note:
Although the above answer is in lexicographical order, your answer could be in any order you want.
class Solution {
private:
map<char, vector<char> > dict;
vector<string> ret;
public:
void createDict()
{
dict.clear();
dict['2'].push_back('a');
dict['2'].push_back('b');
dict['2'].push_back('c');
dict['3'].push_back('d');
dict['3'].push_back('e');
dict['3'].push_back('f');
dict['4'].push_back('g');
dict['4'].push_back('h');
dict['4'].push_back('i');
dict['5'].push_back('j');
dict['5'].push_back('k');
dict['5'].push_back('l');
dict['6'].push_back('m');
dict['6'].push_back('n');
dict['6'].push_back('o');
dict['7'].push_back('p');
dict['7'].push_back('q');
dict['7'].push_back('r');
dict['7'].push_back('s');
dict['8'].push_back('t');
dict['8'].push_back('u');
dict['8'].push_back('v');
dict['9'].push_back('w');
dict['9'].push_back('x');
dict['9'].push_back('y');
dict['9'].push_back('z');
}
void dfs(int depth, int maxdepth, string digits, string value)
{
if(depth == maxdepth)
{
ret.push_back(value);
}
for(int i=0; i<dict[digits[depth]].size(); i++)
{
dfs(depth+1, maxdepth, digits, value+dict[digits[depth]][i]);
}
}
vector<string> letterCombinations(string digits) {
// Start typing your C/C++ solution below
// DO NOT write int main() function
createDict();
ret.clear();
string temp;
dfs(0, digits.size(), digits, temp);
return ret;
}
};
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