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The sudoku minimum number of clues problem is the following question: what is the smallest number of clues that a sudoku puzzle can have? For several years it had been conjectured that the answer is 17. We have performed an exhaustive…

Data Structures and Algorithms · Computer Science 2013-09-03 Gary McGuire , Bastian Tugemann , Gilles Civario

It has been shown that any 9 by 9 Sudoku puzzle must contain at least 17 clues to have a unique solution. This paper investigates the more specific question: given a particular completed Sudoku grid, what is the minimum number of clues in…

Optimization and Control · Mathematics 2023-05-04 Gennesaret Tjusila , Mathieu Besançon , Mark Turner , Thorsten Koch

Solving Sudoku puzzles is one of the most popular pastimes in the world. Puzzles range in difficulty from easy to very challenging; the hardest puzzles tend to have the most empty cells. The current paper explains and compares three…

Optimization and Control · Mathematics 2013-05-17 Eric C. Chi , Kenneth Lange

This paper is concerned with the popular Sudoku problem. We proposed a warm restart strategy for solving Sudoku puzzles, based on the sparse optimization technique. Furthermore, we defined a new difficulty level for Sudoku puzzles. The…

Optimization and Control · Mathematics 2018-03-16 Yuchao Tang , Zhenggang Wu , Chuanxi Zhu

Pattern-Based Constraint Satisfaction and Logic Puzzles develops a pure logic, pattern-based perspective of solving the finite Constraint Satisfaction Problem (CSP), with emphasis on finding the "simplest" solution. Different ways of…

Artificial Intelligence · Computer Science 2013-04-08 Denis Berthier

The success of Large Language Models (LLMs) in human-AI collaborative decision-making hinges on their ability to provide trustworthy, gradual, and tailored explanations. Solving complex puzzles, such as Sudoku, offers a canonical example of…

Computation and Language · Computer Science 2026-04-28 Anirudh Maiya , Razan Alghamdi , Maria Leonor Pacheco , Ashutosh Trivedi , Fabio Somenzi

Causal language modeling using the Transformer architecture has yielded remarkable capabilities in Large Language Models (LLMs) over the last few years. However, the extent to which fundamental search and reasoning capabilities emerged…

Machine Learning · Computer Science 2024-09-17 Kulin Shah , Nishanth Dikkala , Xin Wang , Rina Panigrahy

Despite their proficiency in various language tasks, Large Language Models (LLMs) struggle with combinatorial problems like Satisfiability, Traveling Salesman Problem, or even basic arithmetic. We address this gap through a novel trial &…

Machine Learning · Computer Science 2026-01-19 Panagiotis Giannoulis , Yorgos Pantis , Christos Tzamos

A Sudoku puzzle often has a regular pattern in the arrangement of initial digits and it is typically made solvable with known solving techniques, called strategies. In this paper, we consider the problem of generating such Sudoku instances.…

Data Structures and Algorithms · Computer Science 2020-07-20 Kohei Nishikawa , Takahisa Toda

This paper presents a novel construction method for symmetric Sudoku-type games based on Lee distance perfect codes and diameter perfect codes. The proposed method utilizes the tiling property of these codes to define the structure of the…

Combinatorics · Mathematics 2026-05-12 Junmin An , Jae-Hyun Baek , Keon-Hwi Kim , Haeun Lim , Jon-Lark Kim

Su-Doku, a popular combinatorial puzzle, provides an excellent testbench for heuristic explorations. Several interesting questions arise from its deceptively simple set of rules. How many distinct Su-Doku grids are there? How to find a…

Artificial Intelligence · Computer Science 2008-04-01 Jean-Marie Chauvet

Sudoku is a puzzle well-known to the scientific community with simple rules of completion, which may require a com-plex line of reasoning. This paper addresses the problem of partitioning the Sudoku image into a 1-D array, recognizing…

Machine Learning · Computer Science 2019-05-28 Aditya Narayanaswamy , Yichuan Philip Ma , Piyush Shrivastava

Existing reasoning benchmarks for large language models (LLMs) frequently fail to capture authentic creativity, often rewarding memorization of previously observed patterns. We address this shortcoming with Sudoku-Bench, a curated benchmark…

Artificial Intelligence · Computer Science 2025-05-23 Jeffrey Seely , Yuki Imajuku , Tianyu Zhao , Edoardo Cetin , Llion Jones

We consider a class of l0-minimization problems, which is to search for the partial sparsest solution to an underdetermined linear system with additional constraints. We introduce several concepts, including lp-induced norm (0 < p < 1),…

Information Theory · Computer Science 2013-12-17 Chunlei Xu , Yun-Bin Zhao

This work proposes a research problem of finding sparse solution of undetermined Linear system with some applications. Two approaches how to solve the compressive sensing problem: using l_1 approach , the l_q approach with 0 < q < 1.…

Optimization and Control · Mathematics 2017-02-24 Maddullah Almerdasy

Many practical problems can be formulated as l0-minimization problems with nonnegativity constraints, which seek the sparsest nonnegative solutions to underdetermined linear systems. Recent study indicates that l1-minimization is efficient…

Optimization and Control · Mathematics 2013-12-17 Yun-Bin Zhao

Calculations of the number of equivalence classes of Sudoku boards has to this point been done only with the aid of a computer, in part because of the unnecessarily large symmetry group used to form the classes. In particular, the…

Combinatorics · Mathematics 2013-02-26 Elizabeth Arnold , Rebecca Field , Stephen Lucas , Laura Taalman

We study the performance of first- and second-order optimization methods for l1-regularized sparse least-squares problems as the conditioning of the problem changes and the dimensions of the problem increase up to one trillion. A rigorously…

Optimization and Control · Mathematics 2015-12-16 Kimon Fountoulakis , Jacek Gondzio

Sparse coding algorithms are about finding a linear basis in which signals can be represented by a small number of active (non-zero) coefficients. Such coding has many applications in science and engineering and is believed to play an…

Neural and Evolutionary Computing · Computer Science 2016-08-14 András Lőrincz , Zsolt Palotai , Gábor Szirtes

In this paper, we consider a well-known sparse optimization problem that aims to find a sparse solution of a possibly noisy underdetermined system of linear equations. Mathematically, it can be modeled in a unified manner by minimizing…

Optimization and Control · Mathematics 2021-10-01 Lei Yang , Xiaojun Chen , Shuhuang Xiang
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