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Track A: Algorithms, Complexity and Games
Solving Random Planted CSPs Below the n^{k/2} Threshold

Authors: Arpon Basu, Jun-Ting Hsieh, Andrew D. Lin, and Peter Manohar

Published in: LIPIcs, Volume 374, 53rd International Colloquium on Automata, Languages, and Programming (ICALP 2026)


Abstract
We present a family of algorithms to solve random planted instances of any k-ary Boolean constraint satisfaction problem (CSP). A randomly planted instance of a Boolean CSP is generated by (1) choosing an arbitrary planted assignment x^*, and then (2) sampling constraints from a particular "planting distribution" designed so that x^* will satisfy every constraint. Given an n variable instance of a k-ary Boolean CSP with m constraints, our algorithm runs in time n^O(𝓁) for a choice of a parameter 𝓁, and succeeds in outputting a satisfying assignment if m ⩾ O(n)⋅(n/𝓁)^{k/2 - 1} log n. This generalizes the poly(n)-time algorithm of [Vitaly Feldman et al., 2015], the case of 𝓁 = O(1), to larger runtimes, and matches the constraint number vs. runtime trade-off established for refuting random CSPs by [Prasad Raghavendra et al., 2017]. Our algorithm is conceptually different from the recent algorithm of [Venkatesan Guruswami et al., 2023], which gave a poly(n)-time algorithm to solve semirandom CSPs with m ⩾ Õ(n^{k/2}) constraints by exploiting conditions that allow a basic SDP to recover the planted assignment x^* exactly. Instead, we forego certificates of uniqueness and recover x^* in two steps: we first use a degree-O(𝓁) Sum-of-Squares SDP to find some x̂ that is o(1)-close to x^*, and then we use a second rounding procedure to recover x^* from x̂.

Cite as

Arpon Basu, Jun-Ting Hsieh, Andrew D. Lin, and Peter Manohar. Solving Random Planted CSPs Below the n^{k/2} Threshold. In 53rd International Colloquium on Automata, Languages, and Programming (ICALP 2026). Leibniz International Proceedings in Informatics (LIPIcs), Volume 374, pp. 23:1-23:22, Schloss Dagstuhl – Leibniz-Zentrum für Informatik (2026)


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@InProceedings{basu_et_al:LIPIcs.ICALP.2026.23,
  author =	{Basu, Arpon and Hsieh, Jun-Ting and Lin, Andrew D. and Manohar, Peter},
  title =	{{Solving Random Planted CSPs Below the n^\{k/2\} Threshold}},
  booktitle =	{53rd International Colloquium on Automata, Languages, and Programming (ICALP 2026)},
  pages =	{23:1--23:22},
  series =	{Leibniz International Proceedings in Informatics (LIPIcs)},
  ISBN =	{978-3-95977-428-4},
  ISSN =	{1868-8969},
  year =	{2026},
  volume =	{374},
  editor =	{Bhattacharya, Sayan and Nanongkai, Danupon and Benedikt, Michael and Puppis, Gabriele},
  publisher =	{Schloss Dagstuhl -- Leibniz-Zentrum f{\"u}r Informatik},
  address =	{Dagstuhl, Germany},
  URL =		{https://drops.dagstuhl.de/entities/document/10.4230/LIPIcs.ICALP.2026.23},
  URN =		{urn:nbn:de:0030-drops-264127},
  doi =		{10.4230/LIPIcs.ICALP.2026.23},
  annote =	{Keywords: Random CSPs, Sparse Learning Parity with Noise}
}
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