814

题目链接：点击打开链接

#include <iostream>  #include <cstdio>  #include <string>  #include <set>  #include <map>  #include <vector>    using namespace std;    void parse_address(string const s, string& user, string& mta) {      int t = s.find('@');      user = s.substr(0, t);      mta = s.substr(t + 1);  }    int main() {  #ifndef ONLINE_JUDGE      freopen("test", "r", stdin);  #endif // ONLINE_JUDGE      int k;      string s, t, user1, user2, mta1, mta2;      set<string> addr;        while(cin >> s&& s[0] != '*') {          cin >> t >> k;          while(k--) {cin >> s; addr.insert(s + '@' + t);}      }        while(cin >> s&& s[0] != '*') {          parse_address(s, user1, mta1);            vector<string> mta;          map<string, vector<string> > dest;          set<string> vis;            while(cin >> t&& t[0] != '*') {              if(vis.count(t)) continue;              vis.insert(t);              parse_address(t, user2, mta2);              if(!dest.count(mta2)) {mta.push_back(mta2); dest[mta2] = vector<string>();}              dest[mta2].push_back(t);          }          getline(cin, t);            string data;          while(getline(cin, t)&& t[0] != '*') data += "     " + t + "\n";            for(int i = 0; i < mta.size(); i++) {              mta2 = mta[i];              vector<string> users = dest[mta2];              cout << "Connection between " << mta1 << " and " << mta2 << "\n";              cout << "     HELO "<< mta1 << "\n";              cout << "     250\n";              cout << "     MAIL FROM:<" << user1 << "@" << mta1 << ">\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     354\n";                  cout << data;                  cout << "     .\n" << "     250\n";              }              cout << "     QUIT\n     221\n";          }      }        return 0;  }