вроде нестейбл

#include <iostream>
#include <string>
#include <vector>
#include <algorithm>
#include <fstream>

using namespace std;
ifstream in("input.txt");
ofstream out("output.txt");

struct student {
    string fam, imya, otch;
    int chisl, mec, year;
    int oc[5];
    int summa();
    void vvod() {
        in >> fam >> imya >> otch >> chisl >> mec >> year;
        for (int j = 0; j < 5; j++) {
            in >> oc[j];
        }
    }

    void vivod() {
        out << fam << " " << imya << " " << otch << " " << chisl << " " << mec << " " << year << " ";
        for (int j = 0; j < 5; j++) {
            out << oc[j] << " ";
        }
        out << endl;
    }
};
int student::summa() {
    return oc[0] + oc[1] + oc[2] + oc[3] + oc[4];
}

bool comparator(student left, student right) {
    return(left.summa() < right.summa()); //&& left.fam < right.fam);
}

int main() {
    int n;
    in >> n;
    vector <student> a;
    student t;
    for (int i = 0; i < n; i++) {
        t.vvod();
        a.push_back(t);
    }

    sort(a.begin(), a.end(), comparator);

    for (int i = 0; i < n; i++) {
        a[i].vivod();
    }

    int j;
    in >> j;
    vector <student> b;
    student y;
    for (int i = 0; i < j; i++) {
        y.vvod();
        b.push_back(y);
    }

    stable_sort(b.begin(), b.end(), comparator);

    for (int i = 0; i < j; i++) {
        b[i].vivod();
    }

    return 0;
}
/*
3
MYLNIKOVA N S 24 7 2004 5 5 5 5 5
mylnikova n s 24 7 2004 5 5 5 5 5
a a a 10 2 2007 2 2 2 2 2
3
MYLNIKOVA N S 24 7 2004 5 5 5 5 5
mylnikova n s 24 7 2004 5 5 5 5 5
a a a 10 2 2007 2 2 2 2 2
*/