#include <iostream>
#include <vector>
#include <algorithm> // for std::reverse
 
int main() {
    std::vector<int> a;
    a.emplace_back(5);
    a.emplace_back(4);
    a.emplace_back(3);
    a.emplace_back(2);
    a.emplace_back(1);
 
	std::cout << "Before: ";
    for (int val : a)
        std::cout << val << " ";
    std::cout << std::endl;
 
    std::reverse(a.begin(), a.end());
 
	std::cout << "After: ";
    for (int val : a)
        std::cout << val << " ";
    std::cout << std::endl;
 
    return 0;
}

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