Problem Statement
Solve 9x9 Sudoku puzzle.
Approach
Try 1-9 in empty cells. Backtrack on conflict.
Time & Space Complexity
Time O(9^(n²)), Space O(n²).

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Backtracking constraint satisfaction.
Solve 9x9 Sudoku puzzle.
Try 1-9 in empty cells. Backtrack on conflict.
Time O(9^(n²)), Space O(n²).
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