• 返回最後一個元素：

    return v.back();

• 迭代器：

for (std::vector<int>::iterator it = v.begin(); it != v.end(); it++)
    {
        std::cout<<(*it)<<std::endl;
    }

• 去重：

std::vector<int> unique_element_in_vector(std::vector<int> &v)
{
    std:
 
:vector<int>::iterator vector_iterator;
    sort(v.begin(), v.end());
    vector_iterator = unique(v.begin(), v.end());
    if (vector_iterator != v.end())
    {
        v.erase(vector_iterator, v.end());
    }
    return v;
}

• 在容器中查詢某個元素，返回索引

    std::vector<int>::iterator iter =
 
 std::find(v.begin(), v.end(), value_t_find);
    if (iter == v.end())
    {
        std::cout << "error" << std::endl;
    }
    else
    {
        std::cout << "The index of value: " << (*iter) << " is "
                  << std::distance(v.begin(), iter) <<
 
 std::endl;
    }

• 插入

v1.insert(v1.end(), v2.begin(), v2.end());