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Consider the following stochastic matching problem. We are given a known graph πΊ = (π , πΈ). An unknown subgraph πΊπ = (π , πΈπ ) is realized where πΈπ includes every edge of πΈ independently with some probability π β (0, 1]. The goal is to query a sparse subgraph π» of πΊ, such that the realized edges in π» include an approximate maximum matching of πΊπ . This problem has been studied extensively over the last decade due to its applications in kidney exchange, online dating, and online labor markets. For any fixed π > 0, [BDH STOCβ20] showed that any graph πΊ has a subgraph π» with quasipoly(1/π) = (1/π)poly(log(1/π ) ) maximum degree, achieving a (1 β π)-approximation. A major open question is the best approximation achievable with poly(1/π)- degree subgraphs. A long line of work has progressively improved the approximation in the poly(1/π)-degree regime from .5 [BDH+ ECβ15] to .501 [AKL ECβ17], .656 [BHFR SODAβ19], .666 [AB SOSAβ19], .731 [BBD SODAβ22] (bipartite graphs), and most recently to .68 [DS β24]. In this work, we show that a poly(1/π)-degree subgraph can obtain a (1 β π)-approximation for any desirably small fixed π > 0, achieving the best of both worlds. Beyond its quantitative improvement, a key conceptual contribu- tion of our work is to connect local computation algorithms (LCAs) to the stochastic matching problem for the first time. While prior work on LCAs mainly focuses on their out-queries (the number of vertices probed to produce the output of a given vertex), our analysis also bounds the in-queries (the number of vertices that probe a given vertex). We prove that the outputs of LCAs with bounded in- and out-queries (in-n-out LCAs for short) have limited correlation, a property that our analysis crucially relies on and might find applications beyond stochastic matchings.more » « lessFree, publicly-accessible full text available June 23, 2026
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