Word Break II

 1 class Solution {
 2    vector< vector<int> >  pos;
 3    vector<string> sen;
 4 public:
 5 
 6     vector<string> wordBreak(string s, unordered_set<string> &dict) {
 7          getVector(s,dict);
 8          string tmp="";
 9          getSentence(s,pos,tmp,0);
10         return sen;
11     }
12    void  getSentence(string s,vector<vector<int> > &pos,string tmp,int start)
13     {
14 
15        for(int i=0;i<pos[start].size();i++)
16        if(!pos[start].empty())
17        {//cout<<tmp<<endl;
18            if(pos[start][i]!=s.size())
19             {
20 
21                 getSentence(s,pos,tmp + s.substr(start,pos[start][i]-start) + " ",pos[start][i]);
22             }
23             else
24            {
25            sen.push_back(tmp+s.substr(start,pos[start][i]-start));
26 
27            }
28        }
29 
30 
31 
32     }
33     void getVector(string s, unordered_set<string> &dict)
34     {
35 
36         int setLen = s.size();
37         int start =0;
38         pos.resize(setLen);
39         for(int i=setLen-1;i>=0;i--)
40         {
41            if(dict.count(s.substr(i,setLen-i)))
42               pos[i].push_back(setLen);
43 
44         }
45         for(int j=setLen-1;j>=0;j--)
46         {
47             start = 0;
48             if(!pos[j].empty())
49             for(int k = j;k >0;k--)
50                 {
51                     if(dict.count(s.substr(start,j-start)))
52                         pos[start].push_back(j);
53                          start++;
54                 }
55         }
56        
57 
58 
59     }
60 
61 };