单选题 以下程序执行后的输出结果是( ) . #include <stdio.h> int main( ) { int a[4][5]={1,2,4,8,10,-1,-2,-4,-8,-10,3,5,7,9,11}; int i,j,n=9; i=n/5; j=n-i*5-1; printf("NO. %d: %d,%d is %d\n",n,i,j,a[i][j]); return 0; }