I am doing bit manipulation problems but I used to run a loop from 0 to 32 bits
but why not 64 bits??
can anyone tell me a resource so that I can study.
From which constraints should I use 64 bits ??

\implies log_2(N) \approx 60. Hence iterate on 60 bits

\implies log_2(N)\approx 30. Hence iterate on 30 bits
In the same way you can check according to the constraints of the problem.

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thx a lot

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