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Why do these codes have such huge difference in memory?
By border, 5 years ago, In English

submission 1 submission 2

Is it because of the bitwise operators? If so, why?

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HELP — LightOJ 1397(Sudoku Solver),backtracking with pruning
By border, history, 6 years ago, In English

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)?

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