validate sudoku leetcode It involves filling the grid with numbers and, if a contradiction arises, undoing the last step and trying a different number.
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Step-by-Step Guide to Mastering the Pencil Marks Method: Familiarize yourself with the Sudoku grid: Understand the grid's structure, including the rows, columns, and 3x3 subgrids (also known as boxes). validate sudoku leetcodesudoku answers today nyt For example, if you notice that three cells in a row or column have the same number, try to find another cell in the same row or column with that number.
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