#define _CRT_SECURE_NO_WARNINGS
#include <stdio.h>  
#include <stdlib.h>  
#include <string.h>  

#define MAX_STUDENTS 100  

typedef struct {
    char id[10];
    char class[10];
    char name[20];
    double score1;
    double score2;
    double score3;
    double score;
} Student;

Student students[MAX_STUDENTS];
int studentCount = 0;

void inputStudent() {
    while (1) {
        Student newStudent;
        char option[10];
        printf("Id ");
        scanf("%s", newStudent.id);
        printf("class ");
        scanf("%s", newStudent.class);
        printf("name ");
        scanf("%s", newStudent.name);
        printf("score1 ");
        scanf("%lf", &newStudent.score1);
        printf("score2 ");
        scanf("%lf", &newStudent.score2);
        printf("score3 ");
        scanf("%lf", &newStudent.score3);
        newStudent.score = (newStudent.score1 + newStudent.score2 + newStudent.score3);

        students[studentCount++] = newStudent;

        printf("continue?\n");
        scanf("%s", &option);
        if (strcmp(option, "no") == 0) {
            break;
        }
    }
}

void outputStudents() {
    for (int i = 0; i < studentCount; i++) {
        printf("%s, %s, %s, %.1f, %.1f, %.1f, %.1f\n",
            students[i].id, students[i].class, students[i].name,
            students[i].score1, students[i].score2, students[i].score3,
            students[i].score);
    }
}

void deleteStudent() {
    while (studentCount > 1) {
        char id[10];
        scanf("%s", id);
        char option[10];
        for (int i = 0; i < studentCount; i++) {
            if (strcmp(students[i].id, id) == 0 || strcmp(students[i].name, id) == 0) {
                for (int j = i; j < studentCount - 1; j++) {
                    students[j] = students[j + 1];
                }
                studentCount--;
            }
        }
        outputStudents();
        printf("continue?\n");
        scanf("%s", &option);
        if (strcmp(option, "no") == 0) {
            break;
        }
    }
}

void selectStudent() {
    while (1) {
        char id[10];
        scanf("%s", id);
        int flag = 0;
        char option[10];

        for (int i = 0; i < studentCount; i++) {
            if (strcmp(students[i].id, id) == 0 || strcmp(students[i].class, id) == 0) {
                printf("%s, %s, %s, %.1f, %.1f, %.1f, %.1f\n",
                    students[i].id, students[i].class, students[i].name,
                    students[i].score1, students[i].score2, students[i].score3,
                    students[i].score);
                flag = 1;
            }
        }
        if (flag == 0) {
            printf("there is no eligible student\n");
        }
        printf("continue?\n");
        scanf("%s", &option);
        if (strcmp(option, "no") == 0) {
            break;
        }
    }
}

int compare(const void* a, const void* b) {
    Student* studentA = (Student*)a;
    Student* studentB = (Student*)b;
    if (strcmp(studentA->class, studentB->class) == 0) {
        return (studentB->score - studentA->score > 0) ? 1 : -1;
    }
    return strcmp(studentA->class, studentB->class);
}

void orderStudents() {
    qsort(students, studentCount, sizeof(Student), compare);
    outputStudents();
}

int main() {
    int option;
    do {
        printf("1.input\n");
        printf("2.delete\n");
        printf("3.select\n");
        printf("4.order\n");
        printf("5.output\n");
        printf("6.quit\n");
        printf("Please input your option\n");
        scanf("%d", &option);

        switch (option) {
        case 1: inputStudent(); break;
        case 2: deleteStudent(); break;
        case 3: selectStudent();  break;
        case 4: orderStudents();  break;
        case 5: outputStudents();  break;
        case 6: break;
        }
    } while (option != 6);

    return 0;
}