govniwe

#ifndef Base_h
#define Base_h
#include <iostream>
class Base
{
public:
    int size;
    int* arr;
    void virtual in_out();
};

#endif Base_h

#include "Base.h"
#include <iostream>
using namespace std;
void Base::in_out (){
    cin >> size;
    arr = new int[size];
    for (int i = 0; i < size; i++)
        cin >> arr[i];
}

#ifndef Class1_h
#define Class1_h
#include "Base.h"
#include <iostream>
class Class1 :public Base
{
public:
    virtual int func();
};
#endif

#include "Class1.h"
using namespace std;
int Class1 :: func() {
    int x = arr[0];
    for (int i = 1; i < size + 1; i++) {
        x -= arr[i];
    }
    cout << endl << x << endl;
    return x;
}