A Faster External Memory Priority Queue with DecreaseKeys.

A priority queue is a fundamental data structure that maintains a dynamic set of (key, priority)-pairs and supports Insert, Delete, ExtractMin and DecreaseKey operations. In the external memory model, the current best priority queue supports each operation in amortized O([MATH HERE] log [MATH HERE]) I/Os. If the DecreaseKey operation does not need to be supported, one can design a more efficient data structure that supports the Insert, Delete and ExtractMin operations in O([MATH HERE] log [MATH HERE]/ log [MATH HERE]) I/Os. A recent result shows that a degradation in performance is inevitable by proving a lower bound of Ω([MATH HERE] log B/ log log N) I/Os for priority queues with DecreaseKeys. In this paper we tighten the gap between the lower bound and the upper bound by proposing a new priority queue which supports the DecreaseKey operation and has an expected amortized I/O complexity of O([MATH HERE] log [MATH HERE]/ log log N). Our result improves the external memory priority queue with DecreaseKeys for the first time in over a decade, and also gives the fastest external memory single source shortest path algorithm.