直接写模板即可

#include<iostream>
#include<string>
#include<iomanip>
using namespace std;

template<class T>
void Swap(T& x, T& y)
{
    T tmp = x;
    x = y;
    y = tmp;
}

template<class T>
T Max(const T x, const T y)
{
    return x > y ? x : y;
}

int main()
{
    int a, b;
    cin >> a >> b;
    cout << Max(a, b) << endl;
    double c, d;
    cin >> c >> d;
    cout << fixed << setprecision(2) << Max(c, d) << endl;
    string s1, s2;
    cin >> s1 >> s2;
    Swap(s1, s2);
    cout << s1 << ' ' << s2;
}