Kavitha, T (2005) An (O)overbar(m(2)n) randomized algorithm to compute a minimum cycle basis of a directed graph. In: 32nd International Colloquium on Automata, Languages and Programming (ICALP 2005), JUL 1115, 2005, Lisbon, PORTUGAL.

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Abstract
We consider the problem of computing a minimum cycle basis in a directed graph G. The input to this problem is a directed graph whose arcs have positive weights. In this problem a { 1, 0, 1} incidence vector is associated with each cycle and the vector space over Q generated by these vectors is the cycle space of G. A set of cycles is called a cycle basis of G if it forms a basis for its cycle space. A cycle basis where the sum of weights of the cycles is minimum is called a minimum cycle basis of G. The current fastest algorithm for computing a minimum cycle basis in a directed graph with m arcs and n vertices runs in O(m(w+1)n) time (where w < 2.376 is the exponent of matrix multiplication). If one allows randomization, then an (O) over tilde (m(3)n) algorithm is known for this problem. In this paper we present a simple (O) over tilde (m(2)n) randomized algorithm for this problem. The problem of computing a minimum cycle basis in an undirected graph has been wellstudied. In this problem a {0, 1} incidence vector is associated with each cycle and the vector space over F2 generated by these vectors is the cycle space of the graph. The fastest known algorithm for computing a minimum cycle basis in an undirected graph runs in O(m(2)n + mn(2) logn) time and our randomized algorithm for directed graphs almost matches this running time.
Item Type:  Conference Paper 

Additional Information:  Copyright of this article belongs to Springer. 
Department/Centre:  Division of Electrical Sciences > Computer Science & Automation (Formerly, School of Automation) 
Date Deposited:  02 Mar 2012 11:06 
Last Modified:  02 Mar 2012 11:53 
URI:  http://eprints.iisc.ernet.in/id/eprint/43747 
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