Valid Sudoku

Determine if a \(9 \times 9\) Sudoku board is valid. A Sudoku board has nine \(3 \times 3\) sub-boxes. Validate the filled cells such that each row, column, and sub-box contain the digits \([1, &hellip;, 9]\) without repetition. Unintuitive to me that given a char c , we need c - '0' to convert it into an int . Convert.ToInt32('4') gives us 52 , not 4 . I don&rsquo;t think we can do better than…