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20 results for “NP-hard problem”

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math.COcs.CCTheoreticalRecentJul 10, 2026

Cut-homotopies and the complexity of edge-coloring problems

Alexey Barsukov, Roman Feller, Maximilian Hadek, Davide Perinti

The paper shows that every problem asking if a given graph has an edge-coloring without an edge-colored clique from a fixed family is poly-time equivalent to a Constraint Satisfaction Problem, resulti…

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cs.CCTheoreticalRecentJul 21, 2026

On the Complexity of Graph Edit Distance in Restricted Graph Classes

Maximilian Limmer, Nils M. Kriege

The paper investigates the relationship between graph classes, edit cost functions, and computational complexity of the graph edit distance, providing polynomial-time reductions and correspondences.

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math.COcs.CCTheoreticalRecentJul 9, 2026

Polynomial Binary Optimization

Endre Boros

The paper develops an explicit multi-linear polynomial form for binary polynomial optimization problems after eliminating a subset of variables, allowing for characterization of new special classes wi…

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cs.DScs.GTTheoreticalRecentJul 17, 2026

Solving Stackelberg Vertex Cover on trees using split and join

Dominik Scheder, Johannes Tantow

This paper presents three new algorithms for maximizing revenue in the Stackelberg Vertex Cover problem on certain kinds of trees.

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cs.DSTheoreticalRecentJul 3, 2026

Optimality-Preserving Data Reduction for Maximum k-Cut (Full Version)

Michael Kaibel, Petra Mutzel

This paper introduces structured cut sets, a novel preprocessing technique for Maximum k-Cut, and extends existing techniques from Maximum Cut. The rules are optimality-preserving and yield significan…

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cs.DMmath.COTheoreticalRecentJul 3, 2026

The disjoint separators problem in graphs

Thomas Delépine, Florian Galliot, Yannick Mogge, Leandro Montero +1 more

This paper studies the NP-completeness and provides a polynomial-time algorithm for the disjoint separators problem in planar graphs when all sizes are equal to one.

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cs.DMTheoreticalRecentJun 27, 2026

Local Minima in Quadratic-Penalty Relaxations of Binary Linear Programs

Cheng-Han Huang, Yongliang Sun, Chaoyan Huang, Ismail Alkhouri +1 more

The paper establishes conditions for QUBO formulations of combinatorial optimization problems that guarantee valid binary and feasible local minimizers using gradient-based methods.

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cs.DScs.DMmath.COTheoreticalRecentJul 10, 2026

A Polynomial-Time Algorithm for Coloring Perfect Graphs Based on Walk Counting

Amir Ali Ahmadi, Pravesh K. Kothari, Yukai Tang

A new polynomial-time algorithm is presented for optimally coloring perfect graphs using graph-theoretic operations and iterative walk counting.

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math.COcs.DMTheoreticalRecentJun 26, 2026

Algorithms for the Maximum Edge Open Packing Problem

Sriram Bhyravarapu, Gautam K. Das, Kamal Santra

This paper studies the computational complexity of Maximum Edge Open Packing Problem in distance-hereditary, biconvex bipartite, and chordal graphs, providing polynomial-time algorithms and a fixed-pa…

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cs.DSTheoreticalRecentJul 9, 2026

Primal-Dual Online Algorithms for the Parking Permit Problem

Christian Coester, Alex Turoczy

The paper re-examines the Parking Permit Problem using the primal-dual scheme, obtaining simple algorithms with superior performance guarantees and providing near-matching lower bounds.

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cs.DMTheoreticalRecentJul 3, 2026

Scheduling Tasks towards Energy Autarky: Benefits and Computational Costs of Flexibility

Robert Bredereck, Till Fluschnik, Klaus Heeger

This paper studies the autarky problem of scheduling energy-consuming jobs with time windows using a battery and an energy forecast, and shows NP-hardness, polynomial-time solvability, and fixed-param…

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cs.CCcs.DMTheoreticalRecentJul 10, 2026

Closing the Complexity Gap for Exact Domatic Number at Three and Four

Holger Spakowski

This paper proves DP-completeness of Exact-3-DNP and Exact-4-DNP by reducing 3SAT to these problems.

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cs.DSTheoreticalRecentJun 26, 2026

Incremental Submodular Maximization: Better Than Greedy

Marcin Bienkowski, Joakim Blikstad, Jarosław Byrka, Martín Costa +2 more

The paper presents an adaptive scaling algorithm with a competitive ratio of 1.373 for incremental submodular maximization under increasing cardinality constraint, improving upon the previous best res…

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cs.CCq-bio.QMRecentJun 1, 2026

Structure-Informed Multiple Sequence Alignment: A Formal Model and Hardness Results

Yoshiki Kanazawa, Naphan Benchasattabuse, Michal Hajdušek, Rodney Van Meter

The paper formally models structure-informed multiple sequence alignment (MSA-S) as an NP-complete optimization problem, establishing a strong computational complexity baseline for the field.

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