An A* Algorithm with a New Heuristic Distance Function for the 2-Terminal Shortest Path Problem


IEICE TRANSACTIONS on Fundamentals of Electronics, Communications and Computer Sciences   Vol.E89-A   No.2   pp.544-550
Publication Date: 2006/02/01
Online ISSN: 1745-1337
DOI: 10.1093/ietfec/e89-a.2.544
Print ISSN: 0916-8508
Type of Manuscript: PAPER
Category: Algorithms and Data Structures
shortest path,  preprocessing,  A* algorithm,  routing,  

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The 2-terminal shortest path problem is to find a shortest path between two specified vertices in a given graph G. In this paper, we consider this problem in the following situation: G is given before the two vertices are specified so that some preprocessing is allowed to reduce the response time. We present a method for calculating lower bounds of the length of the shortest path for any pair of vertices. Experimental results show that the A* algorithm with our method performs much better than previous methods.