c++程序崩溃，stl库案例

不明白为什么程序会崩溃，找不出问题

#include
#include
#include
#include
#include
using namespace std;
//1.创建person对象将其放入vector容器中
class person
{
    
public:
    person(int score,string name)
    {
        this->m_name = name;
        this->m_score = score;
    }
    
    int m_score;
    string m_name;

};

void putperson(vector&v)
{
    string nameseed = "ABCDEF";
    for (int i = 0; i < 6; i++)
    {
        string name = "选手";
        name += nameseed[i];
        int score = 0;
        person p(score, name);
        v.push_back(p);
    }
}

void setscore(vector& v)
{
    for (vector::iterator it = v.begin(); it != v.end(); v.begin()++)
    {
        deque<int> p;
        for (int i = 0; i < 10; i++)
        {
            int score = rand() % 40 + 61;
            p.push_back(score);
        
        }
        sort(p.begin(),p.end());
        p.pop_back();
        p.pop_front();

        int sum=0;
        for (deque<int>::iterator it; it != p.end(); it++)
        {
            sum += *it;
        }

        int average = sum / 8;

        it->m_score = average;
    }
}
void test()
{
    vectorp;
    putperson(p);
    //创建6个人
    //并将六个人放入vector容器中
    setscore(p);
    //打分
    //去掉一个最高一个最低
    //取平均分作为最终成绩
    for (vector::iterator it = p.begin(); it != p.end(); it++)
    {
        cout << "姓名   " << it->m_name << "    分数：" << it-> m_score << endl;
    
    }
}

int main()
{
    test();
    system("pause");
    return 0;
}

```

第38行改为

    for (vector<person>::iterator it = v.begin(); it != v.end();it++)

第52-55行改为

        for (deque<int>::iterator it2 = p.begin(); it2 != p.end(); it2++)
        {
            sum += *it2;
        }