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# Solution: Valid Sudoku

## Problem Statement

Determine if a 9x9 Sudoku board is valid. A valid Sudoku board will hold the following conditions:

- Each row must contain the digits 1-9 without repetition.
- Each column must contain the digits 1-9 without repetition.
- The 9 3x3 sub-boxes of the grid must also contain the digits 1-9 without repetition.

**Note:**

- The Sudoku board could be partially filled, where empty cells are filled with the character '.'.
- You need to validate only filled cells.

### Example 1:

**Input**:`[["5","3",".",".","7",".",".",".","."] ,["6",".",".","1","9","5",".","`

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