#define _CRT_SECURE_NO_WARNINGS 1
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#define MAX_STUDENTS 100
typedef struct {
    int id;
    int classs;
    float scores[3];
    float total_score;
    int isnew;
} Student;
Student initial_students[] = {
    {10001, 11, {99.5, 88.5, 89.5}, 277.5, 0},
    {10002, 12, {77.9, 56.5, 87.5}, 221.9, 0},
    {10003, 11, {92.5, 99.0, 60.5}, 252.0, 0}
};
Student* students;
int num_students = 3;
int compare(const void* a, const void* b) {
    Student* student_a = (Student*)a;
    Student* student_b = (Student*)b;
    if (student_a->classs != student_b->classs) {
        return student_a->classs - student_b->classs;
    }
    else {
        return student_b->total_score - student_a->total_score;
    }
}
int check_id_exists(int id) {
    int i;for ( i = 0; i < num_students; i++) {
        if (students[i].id == id) {
            return 1;
        }
    }
    return 0;
}
void insert_student(Student new_student) {
    new_student.isnew = 1;
    num_students++;
    students = (Student*)realloc(students, num_students * sizeof(Student));
    students[num_students - 1] = new_student;
    qsort(students, num_students, sizeof(Student), compare);
}
void print_students() {
    int i;for ( i = 0; i < num_students; i++) {
        printf("%d %d %.1f %.1f %.1f", students[i].id, students[i].classs, students[i].scores[0], students[i].scores[1], students[i].scores[2]);
        if (students[i].isnew) {
            printf(" inserted");
        }
        printf("\n");
    }
}
int main() {
    students = (Student*)malloc(MAX_STUDENTS * sizeof(Student));
    memcpy(students, initial_students, num_students * sizeof(Student));
    Student new_student;
    printf("请输入新学生的信息（学号 班级 成绩1 成绩2 成绩3）：\n");
    scanf("%d %d %f %f %f", &new_student.id, &new_student.classs, &new_student.scores[0], &new_student.scores[1], &new_student.scores[2]);
    new_student.total_score = new_student.scores[0] + new_student.scores[1] + new_student.scores[2];
    if (check_id_exists(new_student.id)) {
        printf("学号 %d 已存在，信息如下：\n", new_student.id);
        int i;for ( i = 0; i < num_students; i++) {
            if (students[i].id == new_student.id) {
                printf("%d %d %.1f %.1f %.1f\n", students[i].id, students[i].classs, students[i].scores[0], students[i].scores[1], students[i].scores[2]);
                break;
            }
        }
    }
    else {
        insert_student(new_student);
        print_students();
    }
    free(students);
    return 0;
}