leetcode 17. Letter Combinations of a Phone Number
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常见DFS题，好久没做了，有点生疏
dfs最常见的就是
dfs（）
{
if(到达边界条件)
输出结果到答案
for（？；？；？）
{
给某全局变量赋值
dfs()
解除全局变量赋值
}
}
class Solution {public:string str[10]={" ","","abc","def","ghi","jkl","mno","pqrs","tuv","wxyz"};vector<string> ans;string dfs_str;void dfs(string digits,int k){int num,str_len,len,i;string now_s;str_len=digits.length();if(k==str_len) //若等于长度，则ans加一个字符串{ans.push_back(dfs_str);return ;}num=digits[k]-'0';now_s=str[num];len=now_s.length();for(i=0;i<len;i++) { dfs_str+=now_s[i]; //dfs_str加一个字符dfs(digits,k+1);dfs_str=dfs_str.substr(0,k); //减一个字符}}vector<string> letterCombinations(string digits){ if(digits.size()==0) return ans;dfs(digits,0);return ans;}}; 0 0
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