leetcode sudoku solver The grid is further divided into 9 3x3 subgrids, also known as "boxes" or "regions." The numbers 1 through 9 must be used, and each number can only appear once in each row, column, and subgrid.
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No Repetition in Rows, Columns, and Boxes : This means that no number can appear more than once in any row, column, or box. leetcode sudoku solversudoku brain training Limited Information : Unlike easier puzzles, Super Hard Sudoku puzzles typically have fewer starting numbers, forcing players to rely on logical deduction and pattern recognition.
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