C++容器输出不显示是为什么

Question

查重代码运行总是出现这个弹窗，该怎么解决？

用容器输入数据之后，输出不显示是为什么？

class Admin:public User
{
public:
    std::vector<Reference>str;
    Reference tmp;
    void input()//录入数据
    {
        cout << "请输入要录入的文献数\n";
        int n;
        cin >> n;
        for (int i = 0; i < n; i++)
        {
            cout << "请输入第" << i+1 << "篇文献的数据"<<endl;
            cin >> tmp.DOI >> tmp.author >> tmp.topic >> tmp.pub >> tmp.year >> tmp.type;
            str.push_back(tmp);
        }
        /*for (vector<Reference>::iterator it = str.begin(); it != str.end(); it++)
        {
            if ((*it).DOI == (*(it-1)).DOI)
            {
                cout << "录入数据有误，请重新录入"<<endl;
            }
        }//查重*/
    }
    void save()//保存数据
    {
        ofstream outFile;
        outFile.open("article.txt");
        for (vector<Reference>::iterator it = str.begin(); it != str.end(); it++)
        {
            outFile << (* it).DOI << (*it).author << (*it).pub << (*it).topic << (*it).year << (*it).type;
        }
        outFile.close();
        cout << "保存成功"<<endl;
    }
    void open()
    {
        char a[1000];
        ifstream fin;
        fin.open("article.txt");
        system("chcp 65001");
        fin >> a;
        cout << a;
    }
    void display()
    {
        for (vector<Reference>::iterator it = str.begin(); it != str.end(); it++)
        {
            cout << (*it).DOI << (*it).author << (*it).pub << (*it).topic << (*it).year << (*it).type << endl;
        }
    }
};

Answer 1

void input() //录入数据
    {
        cout << "请输入要录入的文献数\n";
        int n, ishave;
        cin >> n;
        for (int i = 0; i < n; i++)
        {
            ishave = 0;
            cout << "请输入第" << i + 1 << "篇文献的数据" << endl;
            cin >> tmp.DOI >> tmp.author >> tmp.topic >> tmp.pub >> tmp.year >> tmp.type;

            for (vector<Reference>::iterator it = str.begin(); it != str.end(); it++)
            {
                if ((*it).DOI == tmp.DOI)
                {
                    cout << "录入数据有误，请重新录入" << endl;
                    ishave = 1;
                    break;
                }
            } //查重*/
            if (ishave)
            {
                i--;
                continue;
            }
            str.push_back(tmp);
        }
    }