Have you ever been to a coffee shop during rush hour? That's your real-world experience with a queue. You may not have realized it, but we interact daily with queues. We aim to equip you with the knowledge to tackle any queue-related questions in your interviews confidently. In the upcoming sections, we'll deep-dive into the concept of queues, their implementation, usage scenarios, and common pitfalls in interviews. It sets the stage for impressive, comprehensive responses instead of just adequate answers. The key to acing technical interviews lies in not just understanding the theory behind queues but also being able to apply that knowledge practically. They facilitate operations in operating systems, network traffic management, and memory allocation, and they’re also integral to certain algorithms in data science and machine learning. ![]() Queues, designed around the FIFO (First-In, First-Out) principle, play an essential role in various real-world scenarios, from managing print jobs in a printer to handling requests in a web server. Loop through the map and see if any of the priority deques have data.Understanding queues, a fundamental data structure, is crucial to preparing for technical interviews. Std::map >::iterator End = PriorityMap.end() ![]() Std::map >::iterator Iter = PriorityMap.begin() Template bool CPriorityQueueT ::PopMessage(T & Message, int * pPriority) PriorityMap.insert( std::pair >(Priority, std::deque ())) Std::map >::iterator Iter = PriorityMap.find(Priority) Find the deqeue that has the same priority Template bool CPriorityQueueT ::PushMessage( const T & Message, int Priority) #include #include template class CPriorityQueueTīool PushMessage( const T & Message, int Priority = 5) īool PopMessage(T & Message, int * pPriority = NULL) If you are working with people, separate the elite from the great unwashed public whenever you can (multi-queue). So, if you are working with cold, emotionless applications that do not care if another applications / task / transaction / thread jumps in front of them, Priority queues are the way to go. Everything flows smoothly and pleasantly. Nobody argues with you when you get into that line, the ticket agent checks your status at the desk and politely asks you to go to the other line if you are in the wrong line. Consider the Ticket Office at the MGM Grand at Foxwoods where there is the "general ticket pick-up" line snaking through the lobby and the "Platinum and Diamond Elite" line which is very short and has it's own ticket agent. Multi-Queue (whether single or multi-server) work best in "people" applications. You will be forced to explain your "priority" to everybody else in line and they are the ones who decide if your "priority" is valid or if you are kicked out of line. It's called "line jumping" and you will incur the wrath of everybody else in line. Have you ever tried to user your "priority customer card" at a bank, or worse yet, in the ticket line at a concert. ![]() Priority Queues work well in computer applications but fail horribly when applied to real people. Multi-queue / multi-server queues allow for a totally different priority track for inportant transactions / elements. Priority queues allow you to enter elements in the proper order for removal. ![]() All of my colleagues are correct as far as computer science is concerned.
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