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// https://leetcode.com/problems/gray-code
// T: O(2 ^ n)
// S: O(2 ^ n)
import java.util.ArrayList;
import java.util.List;
public class GrayCode {
public List grayCode(int n) {
final List result = new ArrayList(1 = 0 ; j--) {
result.add(result.get(j) + factor);
}
}
return result;
}
}