Dart Solution
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```\nclass Solution {\n    int minImpossibleOR(List<int> nums) {\n        final List<int> powers = List.generate(32, (i) => 1 << i);\n        for (final p in powers) {\n            if (!nums.contains(p)) {\n                return p;\n            }\n        }\n\n        return -1;\n    }\n}\n```
['Array', 'Bit Manipulation', 'Brainteaser', 'Dart']