如何在std :: vector中管理动态内存？

std::vector<int> myVector;

myVector.push_back(10);
myVector.push_back(20);
myVector.push_back(30);

int size = myVector.size();

int firstElement = myVector[0];
int secondElement = myVector.at(1);

for (int i = 0; i < myVector.size(); ++i) {
    std::cout << myVector[i]<< std::endl;
}

myVector.pop_back();

myVector.clear();

bool isEmpty = myVector.empty();

int capacity = myVector.capacity();

myVector.resize(5);

struct MyData {
    int id;
    std::string name;
};

std::vector<MyData> myVector;

MyData data = {1, "John"};
myVector.push_back(data);