/C++/Check whether the jth object is in the subset

Check whether the jth object is in the subset

Check whether the jth object is in the subset

S = A & (1 << j)
If S = 0, then the j-th item of the set is off.
If S != 0 (to be precise, T = (1 << j)), then the j-th item of the set is on.

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