程序代码：

#include<stdio.h>

struct student
{
    char name[20];
    char id[20];
    float score;
}stu[100];


int main()
{
    int n = 0;
    
    scanf("%d", &n);
    for (int i = 0; i < n; i++)
    {
        scanf("%s%s%f", stu[i].name, stu[i].id, &stu[i].score);
    }

    for (int i = 0; i < n-1; i++)          //选择排序
    {
        for (int j = i+1; j < n; j++)
        {
            if (stu[i].score >= stu[j].score)
            {
                struct student s;
                s = stu[i];
                stu[i] = stu[j];
                stu[j] = s;
            }
        }
    }
    printf("%s %s\n", stu[0].name, stu[0].id);
    printf("%s %s", stu[n - 1].name, stu[n - 1].id);

    return 0;
}