Dsa Bit Hamming Weight

In this tutorial, you'll learn about How to Fix Hamming Weight / Popcount Errors. We cover key concepts, practical examples, and best practices.

Fix hamming weight / popcount errors when loop checks all 32 bits instead of only set bits.

Quick Fix

Wrong

def hamming(n):
    count=0
    for i in range(32):
        if n&(1<<i): count+=1
    return count

Always loops 32 times. For numbers with few set bits, Brian Kernighan is faster.

Right

def hamming(n):
    count=0
    while n:
        n&=n-1  # clears lowest set bit
        count+=1
    return count

hamming(11) = hamming(0b1011) = 3. hamming(128) = 1.

Prevention

Brian Kernighan's: n &= n-1 clears the lowest set bit. Count iterations until 0.

DodaTech Tools

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