读写文件到vector容器时的一点问题

Question

#include<iostream>
#include<fstream>
#include<vector>
using namespace std;
static int counts = 0;
struct student {
    vector <float> score;
};
class CView {
private:
    vector<student> data;
public:
    CView() {
        load();
    }
    ~CView() {
        save();
    }
    student InPut() {
        student st;
        float sc;
        for (int i = 0; i < 3; i++) {
            cin >> sc;
            st.score.push_back(sc);
        }
        return st;
    }
    void Insert(const student st) {
        data.push_back(st);
        counts++;
    }
    void Print() {
        for (auto& x : data) {
            for (int i = 0; i < 3; i++) {
                cout << x.score[i] << " ";
            }
            cout << endl;
        }
    }
    void load() {
        ifstream ifile("student.txt");
        if (!ifile)
        {
            cerr << "file open error " << endl;
            return;
        }
        ifile >> counts;
        student st;
        float s = 0;
        for (int i = 0; i < counts; ++i)
        {
            for (int j = 0; j < 3; ++j)
            {
                ifile >> s;
                st.score.push_back(s);
            }
            data.push_back(st);
        }
    }
    void save() {
        ofstream ofile("student.txt");
        if (!ofile)
        {
            cerr << "file open error " << endl;
            return;
        }
        student st;
        ofile << data.size() << endl;
        for (auto x : data) {
            for (int i = 0; i < 3; i++) {
                ofile << x.score[i] << " ";
            }
            cout << endl;
        }
    }
};
int main() {
    CView cont;
    student stu;
    int selete = 0;
    do {
        cout << "1.插入" << endl;
        cout << "2.打印" << endl;
        cout << "3.退出" << endl;
        cin >> selete;
        switch (selete) {
        case 1:
            stu = cont.InPut();
            cont.Insert(stu);
            break;
        case 2:
            cont.Print();
            break;
        case 3:
            break;
        default:
            cout << "输入错误" << endl;
        }
    } while (selete != 0);
    return 0;
}

第一次运行程序打印时是正常的

第二次载入数据之后打印就成这样了

我想到的是在读取数据时出错了，经过调式，我发现在读取时将数据读到了同一个容器中，但是在不改动结构的基础上不知道怎么改

Answer 1

恩，找到原因了。读取的时候，每push完一个student结构体后，要再重新定义student结构体，这样才能正确的将数据读到对应的容器里。