Sudoku Solver

**Problem Statement:** Given the required input arguments, write an efficient algorithm to solve the **Sudoku Solver** problem. Implement the required logic as specified by standard definitions for this classic algorithmic challenge. **Hint / Expected Approach:** DFS with row/col/box constraint sets **Edge Cases to Consider:** - (1) Already solved board - (2) Minimal clues - (3) No solution board

Examples

Example 1

Input: Classic sudoku puzzle

Output: Solved board

Explanation: Single solution

Example 2

Input: Nearly solved board (1 empty)

Output: Fill last cell

Example 3

Input: Empty board

Output: One valid solution

Explanation: Many solutions exist

Constraints

▪Input arguments are within valid ranges
▪Optimize for execution speed
▪Handle null/empty inputs gracefully

Watch Out For Edge Cases

▪Already solved board
▪Minimal clues
▪No solution board

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