MH-SudokuSolver ver5 Implementation Issues

In the C++ program, there is a statement with bit operations as follows:

st_mask = 0xFFFFFFFF^(3<<st_shift);

With the exact same syntax in Visual Studio, an error message is shown:

Cannot implicitly convert type 'long' to 'int'. An explicit conversion exists (are you missing a cast?)

We end up with the following in C#

st_mask = (unchecked ((int) 0xFFFFFFFF)) ^ (3 << st_shift);

We need a cast to int and unchecked type.

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