Leetcode Number of 1 Bits problem solution

YASH PAL, 31 July 202419 January 2026

In this Leetcode Number of 1 Bits problem solution, we need to write a function that takes an unsigned integer and returns the number of ‘1’ bits it has.

Leetcode Number of 1 Bits problem solution

Leetcode Number of 1 Bits problem solution in Python.

class Solution:
def hammingWeight(self, n):
    return bin(n).count('1')

Number of 1 Bits problem solution in Java.

public class Solution {

public int hammingWeight(int n) {
    int count = 0;
    for (; n != 0; n &= n-1){
        count++;
    }
    return count;
}
}

Problem solution in C++.

class Solution {
public:
    int hammingWeight(uint32_t n) {
        int ans=0;
        while (n)
            ans += n&1, n=n>>1;
        return ans;
    }
};

Problem solution in C.

int hammingWeight(uint32_t n) {
    int count=0;
    while(n)
    {
        if(n&1) count++;
        n=n>>1;
    }
    return count;
}

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