Programming Sudoku

Sudoku is a wildly popular puzzle game. Sudoku puzzles are 9x9 grids, and each square in the grid consists of a 3x3 subgrid called a region. Your goal is to fill in the squares so that each column, row, and region contains the numbers 1 through 9 exactly once. And some squares already contain numbers or symbols, which lend clues toward the solution. Programming Sudoku provides you with great approaches to building and solving Sudoku and other similar puzzles. Using ingenious artificial intellige