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Update BrianKernighanAlgorithm.java

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Varun Upadhyay 2017-12-31 06:47:51 -08:00 committed by GitHub
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Others/BrianKernighanAlgorithm.java
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@ -8,14 +8,11 @@ import java.util.Scanner;
* *
* algorithm to count the number of set bits in a given number * algorithm to count the number of set bits in a given number
* *
* Subtraction of 1 from a number toggles all the bits (from * Subtraction of 1 from a number toggles all the bits (from right to left) till the rightmost set bit(including the
* right to left) till the rightmost set bit(including the
* rightmost set bit). * rightmost set bit).
* So if we subtract a number by 1 and do bitwise & with * So if we subtract a number by 1 and do bitwise & with itself i.e. (n & (n-1)), we unset the rightmost set bit.
* itself i.e. (n & (n-1)), we unset the rightmost set bit.
* *
* If we do n & (n-1) in a loop and count the no of times loop * If we do n & (n-1) in a loop and count the no of times loop executes we get the set bit count.
* executes we get the set bit count.
* *
* *
* Time Complexity: O(logn) * Time Complexity: O(logn)