Parallel depth-first search in general directed graphs

  • Authors:
  • A. Aggarwal;R. J. Anderson;M.-Y. Kao

  • Affiliations:
  • IBM Research Division, T.J. Watson Center, Box 218, Yorktown Heights, NY;Department, of Computer Science, University of Washington, Seattle, WA;Department of Computer Science, Indiana University, Bloomington, IN

  • Venue:
  • STOC '89 Proceedings of the twenty-first annual ACM symposium on Theory of computing
  • Year:
  • 1989

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Abstract

A directed cycle separator of an n-vertex directed graph is a simple directed cycle such that when the vertices of the cycle are deleted, the resulting graph has no strongly connected component with more than n/2 vertices. This paper shows that the problem of finding a directed cycle separator is in randomized NC. The paper also proves that computing cycle separators and conducting depth-first search in directed graphs are deterministic NC-equivalent. These two results together yield the first RNC algorithm for depth-first search in directed graphs.