A reusable enumerate-or-sample framework turns recursion-tree upper bounds into O*(sqrt(b))-time approximate counters, improving bases for five counting problems.
A polynomial-time approximation algorithm for the permanent of a matrix with nonnegative entries.Journal of the ACM (JACM), 51(4): 671–697, 2004
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Faster Exponential-Time Approximate Counting via Bounded Self-Reductions
A reusable enumerate-or-sample framework turns recursion-tree upper bounds into O*(sqrt(b))-time approximate counters, improving bases for five counting problems.