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boston globe sudoku def isValidSudoku(board): def is_valid(board, row, col, num): for i in range(9): if board[row][i] == num or board[i][col] == num: return False if board[3 * (row // 3) + i // 3][3 * (col // 3) + i % 3] == num: return False return True for i in range(9): for j in range(9): if board[i][j] != '.': if not is_valid(board, i, j, board[i][j]): return False return True Step 2: Test the function with a sample Sudoku grid. When selecting a book, consider your current skill level and choose one that offers a good challenge without being too overwhelming. hai di lao sudoku answer Step 4: Look for Rows, Columns, and Subgrids Once you've filled in the given numbers, look for rows, columns, and subgrids where a particular number is missing. usatoday puzzles sudoku
