90分，向大佬们求助

#include<iostream>
#include<string>
#include<stdio.h>
#include<algorithm>
using namespace std;
struct student
{
    int score;
    int x;
    int y;
    int z;
    int number;
};
bool cmp(const student& a, const student& b)
{
    if (a.score == b.score)
    {
        if (a.x == b.x)
        {
            if (a.y == b.y)
            {
                if (a.z == b.z)
                {
                    return a.number < b.number;
                }
                else
                {
                    return a.z > b.z;
                }
            }
            else
            {
                return a.y > b.y;
            }
        }
        else
        {
            return a.x > b.x;
        }
    }
    else
    {
        return a.score > b.score;
    }
}
int main()
{
    struct student stu[300];
    int n;
    cin >> n;
    int i;
    for (i = 0; i < n; i++)
    {
        cin >> stu[i].x >> stu[i].y >> stu[i].z;
        stu[i].score = stu[i].x + stu[i].y + stu[i].z;
        stu[i].number = i + 1;
    }
    sort(stu, stu + n, cmp);
    if (n > 5)
    {
        n = 5;
    }
    for (i = 0; i < n; i++)
    {
        cout << stu[i].number << ' ' <<                 stu[i].score << endl;
    }
    return 0;
}