Finding approximate separators and computing tree width quickly

  • Authors:
  • Bruce A. Reed

  • Affiliations:
  • Forschungsinstitut für Diskrete Mathematik, Universität Bonn, Nassestr. 2, 5300 Bonn 1, Germany

  • Venue:
  • STOC '92 Proceedings of the twenty-fourth annual ACM symposium on Theory of computing
  • Year:
  • 1992

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Abstract

We show that for any fixed k, there is a linear-time algorithm which given a graph G either: (i) finds a cutset X of G with |X| ≤ k such that no component of G–X contains more than 3/4|G–X| vertices, or (ii) determines that for any set X of vertices of G with |X| ≤ k, there is a component of G–X which contains more than 2/3|G–X| vertices.This approximate separator algorithm can be used to develop and O(n log n algorithm for determining if G has a tree decomposition of width at most k (for fixed k) and finding such a tree decomposition if it exists.