#include <iostream>
#include <functional>
#include <vector>
#include <limits>
#include <algorithm>
 
using namespace std;
 
using MyFunc = std::function<int()>;
 
int f1() { return 1; }
int f2() { return 15;}
int f3() { return 3; }
 
int main() {
	std::vector<MyFunc> my_functions{f1, f2, f3};
	std::vector<int> my_results;
	my_results.reserve(my_functions.size());
 
	for (auto const &f : my_functions) {
		my_results.push_back(f());
	}
	auto max_it = std::max_element(std::begin(my_results), std::end(my_results));
	cout << *max_it << endl;
 
	int max = std::numeric_limits<int>::min();
 
	for (auto &f : my_functions) {
		max = std::max(max, f());
	}
 
	cout << max << endl;
 
	return 0;
}

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