python
Intuition\n Describe your first thoughts on how to solve this problem. \n\n# Approach\n Describe your approach to solving the problem. \n\n# Complexity\n- Time 
# Intuition\n<!-- Describe your first thoughts on how to solve this problem. -->\n\n# Approach\n<!-- Describe your approach to solving the problem. -->\n\n# Complexity\n- Time complexity:\n<!-- Add your time complexity here, e.g. $$O(n)$$ -->\n\n- Space complexity:\n<!-- Add your space complexity here, e.g. $$O(n)$$ -->\n\n# Code\n```python3 []\nclass Solution:\n    def minImpossibleOR(self, nums: List[int]) -> int:\n        bit_set = set()\n        for num in nums:\n            if num == num & (-num):\n                bit_set.add(num)\n        \n        i = 1\n        while i in bit_set:\n            i = i << 1\n        return i\n```
['Python3']