Time:O(32) Space:O(1) C++ class Solution { public: int hammingDistance(int x, int y) { int ans = 0; while (x || y) { ans += (x & 1) ^ (y & 1); x >>= 1; y >>= 1; } return ans; } }; JAVA class Solution { public int hammingDistance(int x, int y) { int ans = 0; while (x > 0 || y > 0) { ans += (x & 1) ^ (y & 1); x >>= 1; y >>= 1; } return ans; } }