Dude, bidirectional Dijkstra algorithm is still suboptimal for constant graphs. Behold: presentation (http://www.avglab.com/andrew/pub/sofsem.pdf) & paper (http://www.avglab.com/andrew/pub/msr-tr-2005-132.pdf). See also the author's homepage: Andrew Goldberg (http://research.microsoft.com/en-us/people/goldberg/).
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