Thread: using new with vector<int>*

Hello,
Here is an example of my problem:

Code:

#include <vector>
#include <cstdio>

using namespace std;

int main()
{
        vector<int> *v;
        int     a;
        scanf("%d", &a);

        v=new vector<int>(a);
        if(a<2)
                return -1;
        v[1]=1;
        return 0;
}

When I try to compile it I get such error:

$ g++ test.cpp
test.cpp: In function `int main()':
test.cpp:15: error: no match for 'operator=' in '*(v + 12u) = 1'
/usr/include/c++/3.4/bits/vector.tcc:131: note: candidates are: std::vector<_Tp, _Alloc>& std::vector<_Tp, _Alloc>:perator=(const std::vector<_Tp, _Alloc>&) [with _Tp = int, _Alloc = std::allocator<int>]
$

Without line with v[1]=1; it compiles but I don't know what I do wrong. I have ever example of it in Stroustrup's book but I don't know. I just want to have an outcome similar to
vector<int> v(a);
but I need v to have global so I have to
vector<int> *v;
and then in main() to create it with 'a' amount.
Can anyone help me?
Regards.