#include <iostream>
#include <utility>
#include <vector>

int main() {
    std::vector<int> a{3, 1};
    std::vector<int> b{a};
    std::vector<int> c{std::move(a)};
    b[0] = 9;
    std::cout << "b " << b[0] << ' ' << b[1] << '\n';
    std::cout << "c " << c[0] << ' ' << c[1] << '\n';
    a = std::vector<int>{7};
    std::cout << "a " << a[0] << '\n';
    return 0;
}