Problem
Given a 9x9 Sudoku grid with empty cells as 0, fill the grid to complete the Sudoku (print any valid solution) using recursion.
Input format
Input
input.txt
- 9 lines, each with 9 integers (0-9, 0 means empty)
Output format
Output
output.txt
- The solved Sudoku grid (9 lines, each with 9 numbers)
Example
input
5 3 0 0 7 0 0 0 0 6 0 0 1 9 5 0 0 0 0 9 8 0 0 0 0 6 0 8 0 0 0 6 0 0 0 3 4 0 0 8 0 3 0 0 1 7 0 0 0 2 0 0 0 6 0 6 0 0 0 0 2 8 0 0 0 0 4 1 9 0 0 5 0 0 0 0 8 0 0 7 9
output
[One valid solved sudoku]
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Sample cases (from the problem)
Sample Case 1
Input
5 3 0 0 7 0 0 0 0 6 0 0 1 9 5 0 0 0 0 9 8 0 0 0 0 6 0 8 0 0 0 6 0 0 0 3 4 0 0 8 0 3 0 0 1 7 0 0 0 2 0 0 0 6 0 6 0 0 0 0 2 8 0 0 0 0 4 1 9 0 0 5 0 0 0 0 8 0 0 7 9
Expected output
[One valid solved sudoku]
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