class Solution {
public:
map<char,string> coll;
vector<string> vec;
public:
vector<string> letterCombinations(string digits) {
if(digits.length()==0)
return vec;
f();
digui(0,digits,"");
return vec;
}
void f()
{
coll.insert(pair<char,string>('2',"abc"));
coll.insert(pair<char,string>('3',"def"));
coll.insert(pair<char,string>('4',"ghi"));
coll.insert(pair<char,string>('5',"jkl"));
coll.insert(pair<char,string>('6',"mno"));
coll.insert(pair<char,string>('7',"pqrs"));
coll.insert(pair<char,string>('8',"tuv"));
coll.insert(pair<char,string>('9',"wxyz"));
}
void digui(int i,string str,string res)
{
if(i==str.length())
{
vec.push_back(res);
return ;
}
string tem=coll[str[i]];
for(int k=0;k<tem.length();++k)
digui(i+1,str,res+tem[k]);
}
};
转载于:https://www.cnblogs.com/yanqi110/p/4920219.html
相关资源：数据结构—成绩单生成器
