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DOI: 10.7155/jgaa.00142
Estimating the Number of s-t Paths in a Graph
Vol. 11, no. 1, pp. 195-214, 2007. Regular paper.
Abstract The problem of counting the number of s-t paths in a graph is
#P-complete. We provide an algorithm to estimate the solution
stochastically, using sequential importance sampling. We show that
the method works effectively for both graphs and digraphs.
We also use the method to investigate the expected number of s-t
paths in a random graph of size n and density d, and develop a
model that shows how this quantity behaves when n and d are varied.
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