Leetcode 191. Number of 1 Bits

文章作者：Tyan
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1. Description

Number of 1 Bits

2. Solution

• Version 1

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

• Version 2

class Solution {
public:
    int hammingWeight(uint32_t n) {
        int count = 0;
        int m = 1;
        while(n) {
            count++;
            n &= (n - 1); 
        }
        return count;
    }
};

Reference

1. https://leetcode.com/problems/number-of-1-bits/description/