99.20% faster python MUCH easy solution.
\nclass Solution:\n    def findComplement(self, num: int) -> int:\n        complement=""\n        for i in bin(num)[2:]:\n            if i is "0":\n            
```\nclass Solution:\n    def findComplement(self, num: int) -> int:\n        complement=""\n        for i in bin(num)[2:]:\n            if i is "0":\n                complement+="1"\n            else:\n                complement+="0"\n                \n        return int(complement,2)\n```
['Python', 'Python3']