以下C/C++代码的输出结果是什么？

#include int main() {

int a[3][3] = {{1}, {2, 3}, {4, 5, 6}};

for (int i = 0; i < 3; ++i) {

for (int j = 0; j < 3; ++j) {

if (a[i][j] == 0) {

std::cout << "N/A ";

} else {

std::cout << a[i][j] << ' ';

}

}

}

return 0;}