#include <iostream>
using namespace std;
unsigned long long f(unsigned long long &a, unsigned long long &b, unsigned long long &tmp)
{
tmp = a;
a = b;
b = tmp;
}
int main()
{
unsigned long long a,b,tmp;
cout << "Введите числа: " << endl;
cin >> a >> b;
f(a,b,tmp);
cout << a << b << endl;
return 0;
}
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