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What is a priority queue?

A priority queue is a data structure that stores elements with associated priorities. Elements with higher priorities are served before those with lower priorities, regardless of their order of insertion.

A priority queue is a specialized data structure that stores elements along with their associated priorities, allowing for efficient retrieval based on those priorities. Unlike regular queues that follow the First In, First Out (FIFO) principle, a priority queue serves elements based on their priority level. Elements with higher priorities are dequeued before those with lower priorities, regardless of their order of insertion. Priority queues are often implemented using binary heaps, where the parent node has a higher (or lower, depending on the type of heap) priority than its child nodes, allowing for efficient insertion and extraction operations. The time complexity for insertion and deletion in a priority queue using a binary heap is O(log n), making it a powerful tool for managing tasks in scenarios where priority matters. Priority queues are widely used in various applications, such as scheduling processes in operating systems, managing tasks in simulations, and implementing algorithms like Dijkstra's for shortest paths in graphs. For example, in a task scheduling scenario, tasks with higher importance can be executed first, ensuring that critical operations are prioritized. Understanding priority queues is essential for mastering data structures and algorithms, as they provide a mechanism for organizing and managing tasks based on their urgency or significance, leading to more efficient and effective systems.

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