All-pairs shortest paths for unweighted undirected graphs in o(mn) time

  • Authors:
  • Timothy M. Chan

  • Affiliations:
  • University of Waterloo, Waterloo, Ontario, Canada

  • Venue:
  • SODA '06 Proceedings of the seventeenth annual ACM-SIAM symposium on Discrete algorithm
  • Year:
  • 2006

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Abstract

We revisit the all-pairs-shortest-paths problem for an unweighted undirected graph with n vertices and m edges. We present new algorithms with the following running times:[EQUATION]These represent the best time bounds known for the problem for all m ≪ n1.376. We also obtain a similar type of result for the diameter problem for unweighted directed graphs.