#include <iostream>
#include <deque>
#include <algorithm>
 
int main() {
 
	std::deque<int> d{1,2,3,4,5};
 
	std::cout << "Before multiplying all elements by 2: \n";
	for(auto e: d)
		std::cout << e << ' ';
	std::cout << '\n';
 
	std::transform(std::begin(d), std::end(d), std::begin(d), [](int d){ return (d *= 2); });
 
	std::cout << "\nAfter multiplying all elements by 2: \n";
	for(auto e: d) 
		std::cout << e << ' ';
	std::cout << '\n';
 
	return 0;
}

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