Remove the Bracket

ÌâÄ¿Á´½Ó ÌâÄ¿ÃèÊö£º RSJ has a sequence $a$ of $n$ integers $a_1,a_2,¡­,a_n$ and $a_n$ integer $s$. For each of $a_2,a_3,¡­,a_{n?1}$, he chose a pair of non-negat