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Range Updates and Range Sum Queries on Multidimensional Points with Monoid Weights

Authors Shangqi Lu, Yufei Tao

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ACM Subject Classification
  • Theory of computation → Data structures design and analysis
Keywords
  • Range Updates
  • Range Sum Queries
  • Data Structures
  • Lower Bounds

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Abstract

Let P be a set of n points in ℝ^d where each point p ∈ P carries a weight drawn from a commutative monoid (ℳ, +, 0). Given a d-rectangle r_upd (i.e., an orthogonal rectangle in ℝ^d) and a value Δ ∈ ℳ, a range update adds Δ to the weight of every point p ∈ P∩ r_upd; given a d-rectangle r_qry, a range sum query returns the total weight of the points in P ∩ r_qry. The goal is to store P in a structure to support updates and queries with attractive performance guarantees. We describe a structure of Õ(n) space that handles an update in Õ(T_upd) time and a query in Õ(T_qry) time for arbitrary functions T_upd(n) and T_qry(n) satisfying T_upd ⋅ T_qry = n. The result holds for any fixed dimensionality d ≥ 2. Our query-update tradeoff is tight up to a polylog factor subject to the OMv-conjecture.

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Shangqi Lu and Yufei Tao. Range Updates and Range Sum Queries on Multidimensional Points with Monoid Weights. In 33rd International Symposium on Algorithms and Computation (ISAAC 2022). Leibniz International Proceedings in Informatics (LIPIcs), Volume 248, pp. 57:1-57:16, Schloss Dagstuhl – Leibniz-Zentrum für Informatik (2022) https://doi.org/10.4230/LIPIcs.ISAAC.2022.57

Author Details

Shangqi Lu
  • Chinese University of Hong Kong, New Territories, Hong Kong
Yufei Tao
  • Chinese University of Hong Kong, New Territories, Hong Kong

Funding

This research was supported in part by GRF Projects 14207820 and 14203421 from HKRGC.

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