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HELP — LightOJ 1397(Sudoku Solver),backtracking with pruning
Problem Link: Sudoku Solver
My code: link
Pretty straightforward problem. I tried sorting the blank points on the basis of options for a point. I also tried with simple backtracking. In both cases I got TLE.
What am I missing here?
Also, is there any way to use bits to mask which number is possible for a place(row/column/box)?
