#include <bits/stdc++.h>

using namespace std;

int main()
{
    int arr1[5] = {1, 2, 3, 4, 5};
    vector<double> v1(arr1, arr1 + 5);
    cout << "size: " << v1.size() << endl;
    cout << "capacity: " << v1.capacity() << endl;
    cout << "first addr: " << &v1[0] << endl;

    v1.resize(20); // 重新指定容器的长度
    cout << "size: " << v1.size() << endl;
    cout << "capacity: " << v1.capacity() << endl;
    // 调整前后首地址会发生变化
    cout << "first addr: " << &v1[0] << endl;

    return 0;
}