给你一对数a,b，你可以任意使用$(a,b), (a,-b), (-a,b), (-a,-b), (b,a), (b,-a), (-b,a), (-b,-a)$这些向量，问你能不能拼出另一个向量$(x,y)$。
Niuniu has recently learned how to use Gaussian elimination to solve systems of linear equations.
Given n and $a[i]$, where $n$ is a power of $2$, let’s consider an $n\times n$ matrix $A$.
The index of $A[i][j]$ and $a[i]$ are numbered from $0$.
The element $A[i][j]$ satisfies $A[i][j] = a[i\, xor\, j]$,