template.cpp

#include <bits/stdc++.h>
#define _ ios::sync_with_stdio(0); cin.tie(0);
using namespace std;

struct print{bool space=false;~print(){cout<<'\n';}template<typename T>print&operator,(const T&var){if(space){cout<<' ';}else{space=true;}cout<<var;return*this;}};
#define print print(),

int main() {_
    print 1, 2;
    print "Hello World!";
    return 0;
}