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vector<vector<int>> subsets(vector<int>& nums) { int n = (int) nums.size(); vector<vector<int>> subsets; for(int bitmask = 0; bitmask < (1 << n); bitmask++) { vector<int> subset; for(int bit = 0; bit < n; bit++) { if(bitmask & (1 << bit)) { subset.push_back(nums[bit]); } } subsets.push_back(subset); } return subsets; }
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