如何确定在C++中添加到向量中的值的数量？

#include <iostream>
#include <vector>

int main() {
    std::vector<int> vec = {1, 2, 3, 4, 5};
    int count = 0;

    for (auto it = vec.begin(); it != vec.end(); ++it) {
        count++;
    }

    std::cout << "Number of elements in the vector: " << count << std::endl;

    return 0;
}

#include <iostream>
#include <vector>

int main() {
    std::vector<int> vec = {1, 2, 3, 4, 5};
    int count = 0;

    for (const auto& element : vec) {
        count++;
    }

    std::cout << "Number of elements in the vector: " << count << std::endl;

    return 0;
}