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Summary
This PR adds a new Dana program implementing a recursive backtracking Sudoku solver.
The solver demonstrates a non-trivial recursion + backtracking algorithm, which makes it a valuable addition to the repository’s test programs.
Details
sudoku.danaundertesting/programs/sudoku.input(classic puzzle with 0 = empty)sudoku.result(unique solved Sudoku grid)Features of the Program
isSafe→ validates row, column, and 3×3 subgrid constraints.findEmpty→ locates the next empty cell.solve→ recursive solver with backtracking.printBoard→ prints the solved grid."No solution"if the puzzle has no valid completion.