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vector<int> ivec;
ivec.emplace_back(1);
ivec.emplace_back(ivec.back());
for (auto it = ivec.cbegin(); it != ivec.cend(); ++it)
cout << *it << " ";
cout << endl;
vector<int> ivec;
ivec.emplace_back(1);
ivec.push_back(ivec.back());
for (auto it = ivec.cbegin(); it != ivec.cend(); ++it)
cout << *it << " ";
cout << endl;