#include <vector>
#include <iostream>
std::vector<int> v;
void f() {
    v[-10] = 10;
}

class G {
public:
    G(int v) { std::cout << v << std::endl; }
};

class T : public G {
public:
    T(int A)
        : G(a)
        , a(A)
    {}
private:
    int a;
};

int main() {
    auto t = T(10);
}