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20 results for “lexicographic order”

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cs.DScs.DMTheoreticalRecentJun 11, 2026

(Un)ranking Permutation Classes

Nathanaël Hassler, Vincent Vajnovszki

This paper presents methods for ranking and unranking permutations avoiding a pattern of length three in lexicographic or colexicographic order.

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cs.DMcs.CGTheoreticalRecentJun 11, 2026

On the Counting Sequence of Z-convex Polyominoes

Luca Castelli, Paolo Massazza

This paper presents a set of formulas and equations to compute the longest counting sequence of convex polyominoes of degree of convexity at most 2.

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cs.NEcs.AIRecentMay 29, 2026

Linear Ordering Problem: Time for a Change

Fabrizio Fagiolo, Marco Baioletti, Valentino Santucci

The paper addresses limitations in the Linear Ordering Problem (LOP) by introducing a novel benchmark suite derived from current economic data and an algorithmic scheme to generate diverse, high-quali…

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cs.CLcs.LGRecentMay 30, 2026

French parsing enhanced with a word clustering method based on a syntactic lexicon

Anthony Sigogne, Matthieu Constant, Eric Laporte

The paper enhances French parsing accuracy by integrating data from a syntactic lexicon and applying word clustering methods to verbs within a Probabilistic Context-Free Grammar framework.

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cs.DMTheoreticalRecentJun 11, 2026

Fibonacci and Catalan Numbers Meet in Staircase Polyominoes

Jean-Luc Baril, José Luis Ramírez, Samuel Ramírez, Diego Villamizar

This paper derives multivariate generating functions to refine the enumeration of Fibonacci polyominoes.

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cs.DScs.CCTheoreticalRecentJun 11, 2026

Sketching Intersection Profiles: A Simple Proof and Three Applications

Flavio Chierichetti, Mirko Giacchini, Ravi Kumar, Alessandro Panconesi +2 more

This paper settles the complexity of three sketching problems in graphs and distributions.

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math.COcs.CRRecentApr 21, 2026

Cyclic Equalizability Characterized by Parikh Vectors

Sarunyu Thongjarast, Sarit Pasiphol, Suthee Ruangwises

This paper completely characterizes cyclic equalizability for two words over any finite alphabet by proving that the words must share the same Parikh vector.

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cs.DMcs.ITTheoreticalRecentJun 11, 2026

Entropic Generation of Binary Words

Olivier Bodini, Francis Durand

This paper introduces a novel algorithm for generating k Hamming weight binary words in linear time while minimizing random bit consumption.

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cs.CLRecentMay 31, 2026

Decoding in Order-Agnostic Language Models: Chain-Rule Deviation and Uniform Spreading

Lin Yao

The paper analyzes order-agnostic language models (OALMs), finding that their learned conditionals are not true factorizations and proposing a variance-based diagnostic to compare the quality of diffe…

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cs.CCRecentMay 31, 2026

Recursive Jump Operators and Optimal Proof Systems

Fabian Egidy

The paper investigates the relationship between optimal proof systems and recursive jump operators, showing that while the existence of a jump operator rules out optimality, the converse is provably h…

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cs.AIcs.LGRecentMay 27, 2026

Tree of Thoughts as a Classical Heuristic Search Problem: Formal Foundations and Design Patterns

Guni Sharon

This paper unifies the fragmented field of Tree-of-Thoughts (ToT) reasoning by mapping LLM-based search processes onto a formal taxonomy derived from classical heuristic search theory.

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cs.DMmath.COmath.DSTheoreticalRecentJun 11, 2026

The Curious Case of Reversible Elementary Second Order Cellular Automaton 115

Enrico Formenti, Supreeti Kamylia

The paper proves that the reversible elementary second order cellular automaton rule 115 is periodic when started on finite initial configurations.

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cs.LGcs.AIRecentJun 1, 2026

Variational Learning for Insertion-based Generation

Yangtian Zhang, Zhe Wang, Arthur Gretton, Rex Ying +3 more

The paper introduces the Insertion Process (IP), a novel stochastic generative model that learns variable-length, non-monotonic sequence generation by explicitly modeling the insertion order of tokens…

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cs.CLcs.AIRecentJun 1, 2026

PlanarBench: Evaluating LLM Spatial Reasoning via Planar Graph Drawing

Oleksandr Nikitin

PlanarBench introduces a novel benchmark to test LLM spatial reasoning by requiring them to draw planar graphs as ASCII art from an edge list, finding that edge count is a stronger difficulty predicto…

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math.CTcs.CRRecentMar 17, 2026

From Torsors to Topoi: An Introduction with a View Toward $Σ$-Protocols in Cryptography

Takao Inoué

This paper provides a focused, preparatory introduction to sheaves and topoi, establishing the necessary structural background to understand the advanced sheaf-theoretic framework used in cryptographi…

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cs.DMTheoreticalRecentJun 11, 2026

Snake Polyominoes of Maximal Area in a Rectangle

Alexandre Blondin Massé, Alain Goupil

This paper presents an algorithm to generate snake-like polyominoes within a given rectangle and provides exact formulas for the maximal area of such polyominoes for certain dimensions.

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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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cs.PLcs.CCcs.DBRecentJun 1, 2026

From Time to Space: The Impact of Linearity in Higher-Order Datalog

Angelos Charalambidis, Babis Kostopoulos, Panos Rondogiannis

The paper analyzes a fragment of Higher-Order Datalog, showing that restricting recursion to a linear form shifts its expressive power from time complexity to space complexity, specifically capturing…

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cs.CLcs.AIRecentMay 30, 2026

EPIC: Efficient and Parallel Inference under CFG Constraints for Diffusion Language Models

Hyundong Jin, Yo-Sub Han

The paper proposes EPIC, an efficient and parallel decoding framework that significantly speeds up the process of constraining diffusion language model outputs using Context-Free Grammars (CFG).

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