Help in Bit Manipulation problem

general
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1

Can anyone please help me in solving this problem in O(1)? The constraints are pretty low and allows a bruteforce, but I was wondering how to do this, if L,R<= 10^{18}
Link - Problem
@carre @galencolin @ssrivastava990 @aneee004

2

did you check the discussion section of the problem?

There is a nice and fast solution