36.Valid Sudoku (Medium) Uber Apple Snapchat
Determine if a Sudoku is valid, according to:Sudoku Puzzles - The Rules.
The Sudoku board could be partially filled, where empty cells are filled with the character'.'
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A partially filled sudoku which is valid.
Note:
A valid Sudoku board (partially filled) is not necessarily solvable. Only the filled cells need to be validated.