#include <iostream>
#include <string>
#include <vector>
int main()
{
std::vector<std::string> vec_str;
vec_str.reserve(4);
vec_str.push_back("c++");
vec_str.push_back("c");
std::cout << "size() = " << vec_str.size() << std::endl;
std::cout << "capacity() = " << vec_str.capacity() << std::endl;
return 0;
}
/*
run:
size() = 2
capacity() = 4
*/