--- Why are you so late?

--- I was in half the way when it ________to me that I had left my notebook home, so I had to fetch it.

A．occurred

B．hit

C．happened

D．reminded

有如下程序 main() { int a[3][3]={{1，2}，{3，4}，{5，6}}，i,j,s=0； for(i=1；i＜3；i++) for(j=0;j＜=i;j++)s+=a[i][j]； printf("%d\n"，s)； }该程序的输出结果是______。