,
Alexandra Lassota
Creative Commons Attribution 4.0 International license
We develop algorithms for (min,+)-Convolution and related convolution problems such as Super Additivity Testing, Convolution 3-Sum and Minimum Consecutive Subsums which use the degree of convexity of the instance as a parameter. Assuming the min-plus conjecture (Künnemann-Paturi-Schneider, ICALP'17 and Cygan et al., ICALP'17), our results interpolate in an optimal manner between fully convex instances, which can be solved in near-linear time using Legendre transformations, and general non-convex sequences, where the trivial quadratic-time algorithm is conjectured to be best possible, up to subpolynomial factors.
@InProceedings{brand_et_al:LIPIcs.ISAAC.2023.16,
author = {Brand, Cornelius and Lassota, Alexandra},
title = {{Fast Convolutions for Near-Convex Sequences}},
booktitle = {34th International Symposium on Algorithms and Computation (ISAAC 2023)},
pages = {16:1--16:16},
series = {Leibniz International Proceedings in Informatics (LIPIcs)},
ISBN = {978-3-95977-289-1},
ISSN = {1868-8969},
year = {2023},
volume = {283},
editor = {Iwata, Satoru and Kakimura, Naonori},
publisher = {Schloss Dagstuhl -- Leibniz-Zentrum f{\"u}r Informatik},
address = {Dagstuhl, Germany},
URL = {https://drops.dagstuhl.de/entities/document/10.4230/LIPIcs.ISAAC.2023.16},
URN = {urn:nbn:de:0030-drops-193188},
doi = {10.4230/LIPIcs.ISAAC.2023.16},
annote = {Keywords: (min,+)-convolution, fine-grained complexity, convex sequences}
}