C++ :: Delete Pointers From Vector

I have something like this:

class A {
};

class B : public A {
};

class C : public A {
};

B*b1;
B*b2;
C*c1;
C*c2;

vector<A*>vec;

int main() {
vec.push_back(b1);
vec.push_back(b2);

[Code] ....

And it don't works at all. all i get (when playing with variations of this stuff until it compiles correctlly) is a memory leak.

For example, let say i have b1 address = 1234

I will effectively free the memory at 1234, but for a strange reason, the memory leak is elsewhere, for example, at 2345, and the memory value at this address is equal to... 1234, the address of the pointer i wanted to delete.