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  1. #include <iostream>
  2. #include <stdio.h>
  3. #include <string>
  4. #include <iomanip>
  5. #include <stack>
  6. #include <vector>
  7. #include <algorithm>
  8. #include <cmath>
  9. #include <queue>
  10. #include <map>
  11.  
  12. using namespace std;
  13.  
  14. struct status { //status - password and online
  15.     string password;
  16.     bool online = false;
  17. };
  18.  
  19. map <string, status> database; //user database
  20.  
  21.  
  22. int main () {
  23.     int n; cin >> n; //number of queries
  24.     typedef std::map<std::string, status> db; // use this typedef for using an iterator
  25.     while (n--){
  26.         string com, login; //command and login
  27.         status query; //for status input
  28.         cin >> com;
  29.         if (com == "register"){
  30.             cin >> login >> query.password;
  31.             db::iterator it = database.find(login); //returning an iterator
  32.             if (it != database.end()) { //each el from database is in [begin, end). it = database.end() means that there is no such element in db
  33.                 cout << "fail: user already exists\n";
  34.             }
  35.             else {
  36.                 database[login].password = query.password; // register
  37.                 cout << "success: new user added\n";
  38.             }
  39.         }
  40.         //user can log in if he isn't online but he is registered
  41.         if (com == "login") {
  42.             cin >> login >> query.password;
  43.             db::iterator it = database.find(login);
  44.             if (it != database.end()){
  45.                 if (query.password == database[login].password){
  46.                     if(!database[login].online){
  47.                         database[login].online = true;
  48.                         cout << "success: user logged in\n";
  49.                     }
  50.                     else cout << "fail: already logged in\n";
  51.                 }
  52.                 else cout << "fail: incorrect password\n";
  53.             }
  54.             else cout << "fail: no such user\n";
  55.         }
  56.         //logout
  57.         if (com == "logout") {
  58.             cin >> login;
  59.             if (database.find(login) == database.end()) cout << "fail: no such user\n";
  60.             else {
  61.                 if (!database[login].online) cout << "fail: already logged out\n";
  62.                 else {
  63.  
  64.                     database[login].online = false;
  65.                     cout << "success: user logged out\n";
  66.                 }
  67.             }
  68.         }
  69.     }
  70.     return 0;
  71. }
  72.  
Time limit exceeded #stdin #stdout 5s 3468KB
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https://ideone.com/gipFBJ
language:
C++14 (gcc 8.3)
created:
8 years ago
visibility:
public

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