I have problem with adding object into vector
her's the code

#include <iostream>
#include <vector>

using namespace std;

class Pair {
public:
Pair(int a, int b)
{x=a; y=b;};
int get_x()
{return x;};
int get_y()
{return y;};
private:
int x;
int y;};

int main()
{vector<Pair> set();
Pair* a1 = new Pair(70, 64);

set.push_back(a1);


system("PAUSE");
return 0;
}

and i get only error message :S
pls some help