Given a Sudoku Board configuration, check whether it is valid or not.
Input: [5 3 - - 7 - - - -] [6 - - 1 9 5 - - -] [- 9 8 - - - - 6 -] [8 - - - 6 - - - 3] [4 - - 8 - 3 - - 1] [7 - - - 2 - - - 6] [- 6 - - - - 2 8 -] [- - - 4 1 9 - - 5] [- - - - 8 - - 7 9] Output: True
The basic idea is to check whether each row, column, and the 3×3 box is valid or not on the basis of following points:
- The Sudoku board could be partially filled, where empty cells are filled with the character ‘.’.
- An empty Sudoku board is also valid.
- A valid Sudoku board (partially filled) is not necessarily solvable. Only the filled cells need to be validated.
Below is the C++ code.
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