1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
#include <iostream>
#include <vector>
#include <set>
#include <map>
#include <sstream>
using namespace std;
set<int> v;
map<int, set<string> > user2mail;
map<string, set<int> > mail2user;
vector<string> users;
void dfs(int index)
{
        // cout<<"cur index"<<index<<endl;
        if(v.find(index)!= v.end())
                return;
        else
              v.insert(index);
        for(auto mail: user2mail[index])
        {   
                for(auto user: mail2user[mail])
                {   
                        dfs(user);
                }
        }
}
int main()
{
XXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXX