有以下程序 #include #define N 4 int fun( int a[][N] ) { int i,j,x=0; for(i=0;ifor(j=0;jif (i == j) x += a[N-1-j][i]; return x; } main() { int x[N][N]={{1,2,3,4}, {5,6,7,8}, {9,10,11,12}, {13,14,15,17}}, y; y = fun(x); printf("%d\n",y); } 程序运行后的输出结果是______。