Apply the X-Wing strategy: If there are two cells in the same row, column, or 3x3 subgrid that contain the shared digit, mark them as potential candidates. hard sudokuleetcode valid sudoku The game's objective is to fill a 9x9 grid with digits so that each column, each row, and each of the nine 3x3 subgrids that compose the grid contain all of the digits from 1 to 9.
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