#include <bits/stdc++.h>
using namespace std;
 
vector<future<void>> a;
 
void f() {
	cout << "started\n";
	a.push_back(std::async(std::launch::async, 
    	[]() { std::this_thread::sleep_for(std::chrono::seconds(1)); }));
	cout << "finished\n";
}
 
int main() {
	future<int> x = async([](){this_thread::sleep_for(chrono::seconds(1)); return 0;});
	future<int> y = async([](){this_thread::sleep_for(chrono::seconds(1)); return 1;});
	cout << x.get() << ' ' << y.get() << '\n';
	f();
	f();
}
 

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