Logger logger = new Logger();

// logging string "foo" at timestamp 1

logger.shouldPrintMessage(, "foo"); returns true; 

// logging string "bar" at timestamp 2

logger.shouldPrintMessage(,"bar"); returns true;

// logging string "foo" at timestamp 3

logger.shouldPrintMessage(,"foo"); returns false;

// logging string "bar" at timestamp 8

logger.shouldPrintMessage(,"bar"); returns false;

// logging string "foo" at timestamp 10

logger.shouldPrintMessage(,"foo"); returns false;

// logging string "foo" at timestamp 11

logger.shouldPrintMessage(,"foo"); returns true;

 class Message {

 public:

     int timestamp;

     string msg;

     Message(int ts, string m) : timestamp(ts), msg(m) {}

 };

 class Logger {

 public:

     /** Initialize your data structure here. */

     queue<Message> logQueue;

     unordered_set<string> msgInQueue;

     Logger() {

     }

     /** Returns true if the message should be printed in the given timestamp, otherwise returns false.

         If this method returns false, the message will not be printed.

         The timestamp is in seconds granularity. */

     bool shouldPrintMessage(int timestamp, string message) {

         //remove all msgs before 10s ago

         while (!logQueue.empty() && logQueue.front().timestamp +  <= timestamp) {

             msgInQueue.erase(logQueue.front().msg);

             logQueue.pop();

         }

         bool notInQueue = msgInQueue.count(message) == ;

         //this msg will be printed, add it to log

         if (notInQueue) {

             logQueue.push(Message(timestamp, message));

             msgInQueue.insert(message);

         }

         return notInQueue;

     }

 };

 /**

  * Your Logger object will be instantiated and called as such:

  * Logger obj = new Logger();

  * bool param_1 = obj.shouldPrintMessage(timestamp,message);

  */