An Optimal Labeling for Node Connectivity

  • Authors:
  • Tai-Hsin Hsu;Hsueh-I Lu

  • Affiliations:
  • Department of Computer Science and Information Engineering, National Taiwan University,;Department of Computer Science and Information Engineering, National Taiwan University,

  • Venue:
  • ISAAC '09 Proceedings of the 20th International Symposium on Algorithms and Computation
  • Year:
  • 2009

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Abstract

Given an n-node undirected simple graph G and a positive integer k, the k-connectivity labeling problem for G seeks short labels for the nodes of G such that whether any two nodes are k-connected in G can be determined merely by their labels. For k = 1, an optimal solution to the problem is to give each node in the same connected component of G a common 驴log2 n驴-bit label, uniquely chosen for this connected component. For k 驴 2, Katz, Katz, Korman, and Peleg gave the first nontrivial solution to the problem, requiring O(2 k logn) bits per node. The best previously known solution, due to Korman, requires O(k 2logn) bits per node. We give the first asymptotically optimal solution to the problem, requiring only $(2k-1)\left\lceil\log_2 n\right\rceil$ bits per node, which matches a lower bound 驴(klogn) proved by Katz, Katz, Korman, and Peleg.