It is also used in scheduling processes for a computer, etc. Priority queues are used in many algorithms like Huffman Codes, Prim's algorithm, etc. Thus, a max-priority queue returns the element with maximum key first whereas, a min-priority queue returns the element with the smallest key first. These new implementations include both array-based and linked-list-based queue implementations, a heap-based adaptable priority queue, a bottom-up heap construction, hash tables with either separate chaining or linear probing, splay trees, dynamic programming for the least-common subsequence problem, a union-find data structure with path compression, breadth-first search of a graph, the Floyd-Warshall algorithm for computing a graph’s transitive closure, topological sorting of a DAG, and both the Prim-Jarn´ık and Kruskal algorithms for computing a minimumspanning tree.Priority queue is a type of queue in which every element has a key associated to it and the queue returns the element according to these keys, unlike the traditional queue which works on first come first serve basis. We have included complete Java implementations for many data structures and algorithms that were only described with pseudocode in earlier editions.
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