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  1. #include <iostream>
  2. #include <unordered_map>
  3. #include <string>
  4.  
  5. class UserRegistry {
  6. public:
  7.   void UserEntered(const std::string& user) {
  8.     RegisterUserAction(user, "entered");
  9.   }
  10.  
  11.   void UserExited(const std::string& user) {
  12.     RegisterUserAction(user, "exited");
  13.   }
  14.  
  15. private:
  16.   void LogAction(const std::string& user, const std::string& action, bool is_anomaly = false) {
  17.     std::cout << user << " " << action << (is_anomaly ? " (ANOMALY)" : "") << std::endl;
  18.   }
  19.  
  20.   void RegisterUserAction(const std::string& user, const std::string& action) {
  21.     bool anomaly = false;
  22.     if (action == "entered" && registry[user] % 2 == 1) {
  23.       anomaly = true;
  24.     }
  25.  
  26.     if (action == "exited" && registry[user] % 2 == 0) {
  27.       anomaly = true;
  28.     }
  29.  
  30.     if (!anomaly)
  31.       registry[user]++;
  32.  
  33.     LogAction(user, action, anomaly);
  34.   }
  35.  
  36. private:
  37.   std::unordered_map<std::string, int> registry;
  38. };
  39.  
  40. int main() {
  41.   UserRegistry registry;
  42.   int log_length;
  43.   std::cin >> log_length;
  44.   for (int i = 0; i < log_length; ++i) {
  45.     std::string user, action;
  46.     std::cin >> action >> user;
  47.  
  48.     if (action == "entry")
  49.       registry.UserEntered(user);
  50.     else if (action == "exit")
  51.       registry.UserExited(user);
  52.   }
  53.  
  54.   return 0;
  55. }
Success #stdin #stdout 0s 16072KB
comments (?)
stdin
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8
entry Abbey
entry Abbey
exit Abbey
entry Tyrone
exit Mason
entry Demetra
exit Latonya
entry Idella
stdout
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Abbey entered
Abbey entered (ANOMALY)
Abbey exited
Tyrone entered
Mason exited (ANOMALY)
Demetra entered
Latonya exited (ANOMALY)
Idella entered
https://ideone.com/0RCJpH
language:
C++ (gcc 8.3)
created:
6 years ago
visibility:
public

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