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• W3080296509 abstract "We revisit the Subset Sum problem over the finite cyclic group $mathbb{Z}_m$ for some given integer $m$. A series of recent works has provided near-optimal algorithms for this problem under the Strong Exponential Time Hypothesis. Koiliaris and Xu (SODA'17, TALG'19) gave a deterministic algorithm running in time $tilde{O}(m^{5/4})$, which was later improved to $O(m log^7 m)$ randomized time by Axiotis et al. (SODA'19). In this work, we present two simple algorithms for the Modular Subset Sum problem running in near-linear time in $m$, both efficiently implementing Bellman's iteration over $mathbb{Z}_m$. The first one is a randomized algorithm running in time $O(m log^2 m)$, that is based solely on rolling hash and an elementary data-structure for prefix sums; to illustrate its simplicity we provide a short and efficient implementation of the algorithm in Python. Our second solution is a deterministic algorithm running in time $O(m mathrm{polylog} m)$, that uses dynamic data structures for string manipulation. We further show that the techniques developed in this work can also lead to simple algorithms for the All Pairs Non-Decreasing Paths Problem (APNP) on undirected graphs, matching the near-optimal running time of $tilde{O}(n^2)$ provided in the recent work of Duan et al. (ICALP'19)." @default.
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• W3080296509 date "2020-08-24" @default.
• W3080296509 modified "2023-10-14" @default.
• W3080296509 title "Fast and Simple Modular Subset Sum" @default.
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• W3080296509 doi "https://doi.org/10.48550/arxiv.2008.10577" @default.
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