Only 2 variable.How?
I have learned about iostream, math.h and algorithm but more wouldn’t hurt.

I tried:

#include<iostream>
#include<algorithm>
using namespace std;
int main(){
    int a;
    int b;
    cin>>a;
    cin>>b;
    int a=max(a,b);
    cin>>b;
    int a=max(a,b);
    cin>>b;
    int a=max(a,b);
    return 0;
}

It doesn’t work