Câu 68: CPP: C++ Certified Professional Programmer

What happens when you attempt to compile and run the following code?#include #include #include using namespace std;template struct Out {ostream & out;Out(ostream & o): out(o){}void operator()(const T & val ) {out v1(10);vector v2(10);generate(v1.begin(), v1.end(), Sequence(1));sort(v1.rbegin(), v1.rend());unique_copy(v1.begin(),v1.end(), v2.begin());for_each(v2.begin(), v2.end(), Out (cout) );cout<<endl; return 0;}Program outputs:

1. A. 20 30 10 20 30 10 20 30 10 20
2. B. 30 20 10 0 0 0 0 0 0 0 — đáp án hiện tại
3. C. 30 0 0 0 0 0 0 0 20 10
4. D. compilation error