% use \setcounter{MaxMatrixCols}{14} in preamble
\begin{bmatrix}
-1 & 1 & 0 &  0 & 0 &  0 & 0 &  0 & 0 &  0 &  0 &  0 & 0 & 0 \\
 0 & 0 & 1 & -1 & 0 &  0 & 0 &  0 & 0 &  0 &  0 &  0 & 0 & 0 \\
 0 & 0 & 0 &  0 & 1 & -1 & 0 &  0 & 0 &  0 &  0 &  0 & 0 & 0 \\
 0 & 0 & 0 &  0 & 0 &  0 & 1 & -1 & 0 &  0 &  0 &  0 & 0 & 0 \\
 0 & 0 & 0 &  0 & 0 &  0 & 0 &  0 & 1 & -1 &  0 &  0 & 0 & 0 \\
 0 & 0 & 0 &  0 & 0 &  0 & 0 &  0 & 0 &  0 & -1 & -1 & 1 & 1
\end{bmatrix}