algorithm

use for test

int a = s;
ddd

$$ \left{ \begin{matrix} 1 & 2 & 3 \\ 4 & 5 & 6 \\ 5 & 6 & 7 \end{matrix} \tag{1} \right} $$

$\alpha $

$\pi$ $$ a = \left[ \matrix{ \alpha_1 & test1\ \alpha_2 & test2\ \alpha_3 & test3 } \right] $$