Optimal attack and reinforcement of a network
Journal of the ACM (JACM)
A fast parametric maximum flow algorithm and applications
SIAM Journal on Computing
Computing the strength of a graph
SIAM Journal on Computing
A faster algorithm for computing the strength of a network
Information Processing Letters
Algorithms for graphic polymatroids and parametric &smacr;-sets
Journal of Algorithms
ISAAC '92 Proceedings of the Third International Symposium on Algorithms and Computation
The Multi-Tree Approach To Reliability In Distributed Networks
SFCS '84 Proceedings of the 25th Annual Symposium onFoundations of Computer Science, 1984
WINE '09 Proceedings of the 5th International Workshop on Internet and Network Economics
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The problem of computing the strength and performing optimal reinforcement for an edge-weighted graph G(V, E, w) is well-studied [1,2,3,6,7,9]. In this paper, we present fast (sequential linear time and parallel logarithmic time) on-line algorithms for optimally reinforcing the graph when the reinforcement material is available continuosly online. These are first on-line algortithms for this problem. Although we invest some time in preprocessing the graph before the start of our algorithms, it is also shown that the output of our on-line algorithms is as good as that of the off-line algorithms, making our algorithms viable alternatives to the fastest off-line algorithms in situtations when a sequence of more than O(|V|) reinforcement problems need to be solved. In such a situation the time taken for preprocessing the graph is less that the time taken for all the invocations of the fastest off-line algorithms. Thus our algorithms are also efficient in the general sense. The key idea is to make use of the theory of Principal Partition of a Graph. Our results can be easily generalized to the general setting of principal partition of nondecreasing submodular functions.