while (q<6)
{
    if (i == 1) {
        vector3 *s = new vector3[i + 1];

    }
    vector3 *p = new vector3[i + 1];
    if (i != 1) {
        for (int j = 1; j < i + 1; j++) {
            p[i] = s[i];
        }
        delete[] s;
    }

    cin >> q;
    if (q == 2) {
        t++;
    }
    vector3 *s = new vector3[i + 2];
    for (int j = 1; j < i + 1; j++) {
        s[i] = p[i];
    }
    delete[] p;
    i++;

}

if (i == 1)
{
    vector3 *s = new vector3[i + 1];
}

vector3 *s;

if (i == 1)
{
    s = new vector3[i + 1];
}

vector3 *s = NULL;
if (i == 1) {
    s = new vector3[i + 1];
}
...