#include <iostream>
#include <deque>
int main() {
std::deque<int> d;
d.push_back(1);
d.push_back(2);
d.push_back(3);
for (int i = 0; i < 3; ++i)
std::cout << d.at(i) << ' ' ;
std::cout << std::endl;
return 0;
}
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