UVA_814

#include<iostream>
#include<string>
#include<vector>
#include<set>
#include<map>
using namespace std;

void parse_address(const string& s, string &user, string& mta){
    int k=s.find(‘@‘);
    user=s.substr(0,k);
    mta=s.substr(k+1);
}

int main(){
    int k;
    string s,t,user1,mta1,user2,mta2;
    set<string> addr;

    //输入所有MTA，转化为地址列表
    while(cin>>s && s!="*"){
        cin>>s>>k;
        while(k--){ cin>>t; addr.insert(t+"@"+s);}
    }

    while(cin>>s && s!="*"){
        parse_address(s,user1,mta1);//处理发件人地址
        vector<string> mta;//所有需要连接的mta，按照输入顺序
        map<string, vector<string> > dest;//每个MTA需要发送的用户
        set<string> vis;
        
        while(cin>>t && t!="*"){
            parse_address(t,user2,mta2);//处理收件人地址
            if(vis.count(t)) continue;//重复的收件人
            vis.insert(t);
            if(!dest.count(mta2)){
                mta.push_back(mta2);
                dest[mta2]=vector<string>();
            }
            dest[mta2].push_back(t);
        }
        getline(cin,t);//把‘*‘这一行的回车吃掉

        //输入文件正文
        string data;
        while(getline(cin,t) && t[0]!=‘*‘) 
            data+="     "+t+"\n";
        for(int i=0;i<mta.size();i++){
            string mta2=mta[i];
            vector<string> users=dest[mta2];
            cout<<"Connection between "<<mta1<<" and "<<mta2<<endl;
            cout<<"     HELO "<<mta1<<"\n";cout<<"     250\n";
            cout<<"     MAIL FROM:<"<<s<<">\n";cout<<"     250\n";
            bool ok=false;
            for(int i=0;i<users.size();i++){
                cout<<"     RCPT TO:<"<<users[i]<<">\n";
                if(addr.count(users[i])){ok=true;cout<<"     250\n";}
                else cout<<"     550\n";
            }
            if(ok){
                cout<<"     DATA\n";cout<<"     354\n";
                cout<<data;
                cout<<"     .\n";cout<<"     250\n";
            }
            cout<<"     QUIT\n";cout<<"     221\n";
        }
    }
    return 0;
}