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play sudoku online if __name__ == "__main__": board = [ ["5", "3", ".", ".", "7", ".", ".", ".", "."], ["6", ".", ".", "1", "9", "5", ".", ".", "."], [".", "9", "8", ".", ".", ".", ".", "6", "."], ["8", ".", ".", ".", "6", ".", ".", ".", "3"], ["4", ".", ".", "8", ".", "3", ".", ".", "1"], [".", "6", ".", ".", ".", "7", "9", ".", "."], [".", ".", "7", ".", ".", ".", ".", "2", "4"], [".", "2", "1", ".", "9", ".", ".", ".", "5"], [".", ".", ".", "8", ".", ".", ".", "7", "9"] ] print(isValidSudoku(board)) Output: True Conclusion: Valid Sudoku is a popular problem on LeetCode that tests your ability to solve puzzles using algorithmic thinking. nytimes sudoku medium How to Implement the Swordfish Strategy: Identify the number: Begin by locating a number that appears only twice in a row or column. Here are some strategies to help you succeed: Start by filling in the known numbers according to the standard Sudoku rules. sudoku difficult printable These puzzles typically have fewer clues, making them less challenging than the more advanced versions. sudoku difficult printableleetcode valid sudoku Use the process of elimination If you're stuck on a square, use the process of elimination to determine the possible numbers for that square.
