#include <vector>
#include <iostream>
int main() {
std::vector<int> v = {1,2,3,4,5,6};
int& i = v[2]; //should point to 3
std::cout << i << '\n';
v.resize(30);
v.push_back(7);
v.push_back(8);
v.push_back(9);
std::cout << i;
}
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