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Sudoku - PowerPoint PPT Presentation

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Sudoku. Introduction.

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PowerPoint Slideshow about 'Sudoku' - harley

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Presentation Transcript
  • In this presentation I will cover the Sudoku puzzle, some basics of its complexity as well as specifically discussing the complexity of order 2 and order 3 Sudoku puzzles. I will also show and discuss the beginnings of NDFSMs for order 2 Sudoku puzzles and order 3 Sudoku puzzles to determine if a solution is correct.
  • Most commonly, a sudoku puzzle is a 9x9 grid of the numbers 1-9 where in each row, column, and 3x3 grid each number is only used once.
  • This is an “order 3” sudoku – an order n sudoku would be an n2xn2 grid of the numbers 1-n, with n2 nxn grids.
how complex is it
How complex is it?
  • For an order 3 sudoku you just have to be able to count to 9, so how hard are they really?
  • How many different answers can there be?
order 2 sudoku
Order 2 sudoku
  • For order 2 sudoku puzzles there are 288 possible answers
  • When symmetries are considered there are actually only 2 distinct puzzles with the remainder being some variation
order 3 sudoku
Order 3 sudoku
  • For order 3 sudoku puzzles there are 6,670,903,752,021,072,936,960 possible combinations
  • Symmetrical operations only reduce this to 3,546,146,300,288
more complex data structure
More complex data structure
  • 2 dimensional array for checking
    • Number the columns, rows, and interior grids
    • Boolean
  • 2 dimensional array for solving
    • Number the columns, rows, and interior grids
    • Each cell has a linked list of possible values
    • Some sort of relationship among the rows, columns, and grids to identify what cells are affected by a change in each
  • If you can solve sudoku puzzles you’re a genius!
  • Both a human or computer would take a different approach to solve or verify a solution, as FSMs are probably not the best way to approach the problem
  • “A Pencil-and-Paper Algorithm for Solving Sudoku Puzzles” J.F. Crook
  • American Scientist “Unwed Numbers” Brian Hayes