منابع مشابه
Optimal Purely Functional Priority Queues
Brodal recently introduced the first implementation of imperative priority queues to support findMin, insert, and meld in O(1) worst-case time, and deleteMin in O(log n) worst-case time. These bounds are asymptotically optimal among all comparison-based priority queues. In this paper, we adapt Brodal’s data structure to a purely functional setting. In doing so, we both simplify the data structu...
متن کاملSimple and Efficient Purely Functional Queues and Deques
We present purely functional implementations of queues and double-ended queues (deques) requiring only O(1) time per operation in the worst case. Our algorithms are considerably simpler than previous designs with the same bounds. The inspiration for our approach is the incremental behavior of certain functions on lazy lists.
متن کاملWorst-Case Optimal Priority Queues via Extended Regular Counters
We consider the classical problem of representing a collection of priority queues under the operations find-min, insert , decrease, meld , delete, and delete-min. In the comparison-based model, if the first four operations are to be supported in constant time, the last two operations must take at least logarithmic time. Brodal showed that his worst-case efficient priority queues achieve these w...
متن کاملOptimal Policies for Multi-server Non-preemptive Priority Queues
We consider a multi-server non-preemptive queue with high and low priority customers, and a decision maker who decides when waiting customers may enter service. The goal is to minimize the mean waiting time for high-priority customers while keeping the queue stable. We use a linear programming approach to find and evaluate the performance of an asymptotically optimal policy in the setting of ex...
متن کاملTime Dependent Priority Queues
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ژورنال
عنوان ژورنال: BRICS Report Series
سال: 1996
ISSN: 1601-5355,0909-0878
DOI: 10.7146/brics.v3i37.20019