why wrong answer?
#include <iostream>
using namespace std;
int main()
{
    int banki=10, banki_s, bankis_ss;
    cout << "Harry shot cans: ";
    cin >> banki_s;
    cout << "Larry shot cans: ";
    cin >> bankis_ss;
cout << "Harry shot: " << (banki - banki_s) << endl;
cout << "Larry shot: " << (banki - bankis_ss) << endl;

    return 0;
}

int main()
{
    code:
        int banki, banki_s, bankis_ss;
    cout << "Harry shot cans: ";
    cin >> banki_s;
    cout << "Larry shot cans: ";
    cin >> bankis_ss;
    banki = (banki_s + bankis_ss) - 1;
        cout << "Harry shot: " << (banki - banki_s) << endl;
        cout << "Larry shot: " << (banki - bankis_ss) << endl;
    system("PAUSE");
    return 0;
}