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Print Value Of Rsb Mask

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1. You are given a number n.
2. You have to print the right-most set bit mask.
Input Format 
A number n
Output Format 
A number
Question Video
Constraints 
1 <= n <= 10^9
Sample Input 
58
Sample Output 
10


  • Editorial

    The problem here deals with getting the rightmost set bit of the given input number. For example, n = 58 => [ 1 1 1 0 1 0 ], the answer should be 2 => [ 0 0 0 0 1 0 ] as the rightmost set bit for n is at 1st index.

    To achieve this we need to follow two steps firstly we need to flip the bits of the input number and store it in a mask. Thereafter we need to add 1 to the mask to get our desired mask. AND operation with this mask will yield us the RSB of the given input number.

    Generalised Case for RSB:

    Time Complexity: O(1)

    The time complexity for the function is constant as basic bit operations are involved.

    Space Complexity: O(1)

    The space complexity for the function is constant.

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