2220. Minimum Bit Flips to Convert Number

class Solution {
public:
    int minBitFlips(int start, int goal)
    {
        int n = start ^ goal;
        int cnt = 0;
        while (n)
        {
            n &= (n - 1);
            cnt++;
        }
        return cnt;
    }
};

• T: $O(number of bits)$
• S: $O(1)$