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sudoku solver by andrew stuart 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. competitive sudoku Remember, practice makes perfect, so keep challenging yourself with increasingly difficult puzzles and watch your skills grow. If these numbers are the only possibilities in two different rows or columns, they must occupy the same cells in the intersecting columns or rows, respectively. 3d medusa sudoku
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