Hello guys! I tried without succes to solve this gorgeous problem (http://codeforces.com/contest/587/problem/E). I looked after in the editorial and I still have some questions : What is really the basis of a vector and why the answer is always 1 << b.size() , where b = basis of the subsequence ? If you know the answers or you can offer me another solution to the problem, please help me :D Thanks in advance!
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It requires knowledge of Linear Algebra. [Basis](https://en.wikipedia.org/wiki/Basis_(linear_algebra)) is mathematical term used in it.