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Book Cover
Author Zambon, Giulio, author

Title Sudoku programming with C / Giulio Zambon
Published [Place of publication not identified] : Apress, 2015


Description 1 online resource : illustrations (some color)
Contents At a Glance; Contents; About the Author; Introduction; Chapter 1: Modeling a Sudoku Puzzle in C; Solving a Puzzle; Generating a Puzzle; Modeling the Puzzle; Summary; Chapter 2: The Strategies; Level 0 Strategies; The Strategy Naked Single; The Strategy Unique; The Strategy Cleanup; Usage of Level 0 Strategies; Level 1 Strategies; The Strategy Naked Pair; The Strategy Hidden Pair; The Strategy Box-Line; The Strategy Pointing Line; Level 2 Strategies; The Strategies Naked Triple and Naked Quad; The Strategy Hidden Triple; The Strategy Lines-2; The Strategy Y-wing; Level 3 Strategies
The Strategy X Y-ChainThe Strategy Rectangle; The Strategies Lines-3 and Lines-4; Level 4 Strategies; What about Coloring?; Strategy Selection; Summary; Chapter 3: The Solver Program; init(); cleanup(); solve(); Counting; Checking Consistency; Input/Output; Summary; Chapter 4: Implementing "Unique"; unique_unit(); unique(); unique_loop(); Summary; Chapter 5: Implementing "Naked" Strategies; naked_pair_unit(); naked_triple_unit(); naked_quad_unit(); Summary; Chapter 6: Implementing "Hidden" Strategies; hidden_pair_unit(); hidden_triple_unit(); Summary
Chapter 7: Implementing "Box-Line"box_line(); box_line_unit(); Summary; Chapter 8: Implementing "Pointing Line"; pointing_line(); pointing_line_box(); Summary; Chapter 9: Implementing "Lines" Strategies; lines_2(); lines_3(); lines_4(); lines(); An Example; Summary; Chapter 10: Implementing "Y-wing"; pairs_find(); y_wing_digit(); intersection(); footprint(); An Example; Summary; Chapter 11: Implementing "XY-chain"; xy_chain_digit(); xy_chain_step(); An Example; Summary; Chapter 12: Implementing "Rectangle"; rectangle(); rectangle_pattern(); rectangle_cell(); rectangle_step()
Case A: n == 0 and kBeq 0 and kBeq 0 and kBeq == 3; An Example; rectangle_step(): for 6, kBeq 0, chain: (1,5); rectangle_step(): for 6, kBeq 1, chain (1,5) (0,6); rectangle_step(): for 6, kBeq 2, chain (1,5) (0,6) (7,7); rectangle_step(): for 6, kBeq 3, chain (1,5) (0,6) (7,7) (6,5); rectangle_step(): for 6, kBeq 1, chain (1,5) (0,7); rectangle_step(): for 6, kBeq 2, chain (1,5) (0,7) (6,6); rectangle_step(): for 6, kBeq 3, chain (1,5) (0,7) (6,6) (7,4); rectangle_step(): for 9; Pointing-line within rectangle; Summary
Chapter 13: Implementing "Backtrack"display_strats_in_clear(); Optimization; An Example; Summary; Chapter 14: Solving Thousands of Puzzles; The Example of Minimum Sudokus; Summary; Chapter 15: Generating Sudokus; Generating a Solved Sudoku; init() for the Generator; fill(); fill_digit(); Removing Clues to Make a Puzzle; brute_comp(); inconsistent_unit() for the Generator; Check for Uniqueness of the Solution; Completing the Generator; Utilities for the Generator; Summary; Chapter 16: Puzzle Statistics and More Puzzles; Statistic on Number of Clues; Statistic on Numbers
Summary Sudoku Programming with C teaches you how to write computer programs to solve and generate Sudoku puzzles. This is a practical book that will provide you with everything you need to write your own books of Sudoku Classic and Samurai puzzles. But be warned: after reading it, you'll discover that the puzzles in your local paper are not so challenging after all! We like Sudokus because they test our capacity to recognize and interpret patterns. But how are the clues generated? Where do those quasi-symmetrical configurations come from? When the author explored the Web to find out, he discovered that there were many sites that explained how to solve Sudokus, but none that told him how create them. He also saw many sites and apps to play Sudoku, but, perhaps not surprising, no indication of how they worked. So, he had to develop his own applications in order to find out. And, from the very start, he decided that he would publish the code for anyone else to use and perhaps tinker with, but the author wrote it in such a way that also lets readers with limited knowledge of programming techniques understand it. In fact, you could decide to start generating thousands of puzzles almost immediately, and go through the explanations of algorithms and techniques later, a bit at a time. The author chose to write the application in?plain old C? because he wanted to make the code accessible to as many people as possible. In this book, you will find an explanation of all solving strategies, and the code to implement them. Writing the Solver application was more difficult than writing the Generator, because it required designing and implementing each strategy separately. However, the author wanted to include a solving program capable of listing the strategies necessary to solve any particular puzzle. He also wanted to check whether a puzzle was solvable analytically, without any guessing. This book includes the full listings of both the Generator and the Solver, and explanations of all C modules, with walk-throughs and examples
Analysis computerwetenschappen
computer sciences
programming languages
Information and Communication Technology (General)
Informatie- en communicatietechnologie (algemeen)
Notes Includes index
Online resource; title from PDF title page (EBSCO, viewed April 1, 2015)
Subject C (Computer program language)
Computer programming -- software development.
Programming & scripting languages: general.
Games development & programming.
COMPUTERS -- Programming Languages -- C.
C (Computer program language)
Genre/Form Sudoku puzzles
Sudoku puzzles.
Form Electronic book
ISBN 9781484209950