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Given a positive integer N, print count of set bits in it.
N = 6
Binary representation is '110'
So the count of the set bit is 2.
Binary representation is '1000'
So the count of the set bit is 1.
You don't need to read input or print anything. Your task is to complete the function setBits() which takes an Integer N and returns the count of number of set bits.
Expected Time Complexity: O(LogN)
Expected Auxiliary Space: O(1)
1 ≤ N ≤ 109
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