#include <iostream>
#include <functional>
#include <vector>
#include <algorithm>
 
using namespace std;
 
template<typename T, typename U>
std::vector<U> map(const std::vector<T> &v, std::function<U(const T&)> f) {
    std::vector<U> res;
    res.reserve(v.size());
    std::transform(std::begin(v), std::end(v), std::inserter(res, res.begin()), f);
    return res;
}
 
 
int main() {
	vector<int> numbers = { 1, 3, 5 };
 
	//vector<string> strings = map(numbers, [] (int x) { return string(x,'X'); });
 
	vector<string> strings = map<int, string>(numbers, [] (int x) { return string(x,'X'); });
 
	for (const string& s : strings) {
		cout << s << "\n";
	}
 
	return 0;
}

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