pvjc24/cv5/program.c

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

typedef struct student {
    char *name;
    int vote_count;
} student_t;

int compare_students(const void *a, const void *b) {
    const student_t *student_a = (const student_t *)a;
    const student_t *student_b = (const student_t *)b;

    if (student_a->vote_count > student_b->vote_count) {
        return -1;
    } else if (student_a->vote_count < student_b->vote_count) {
        return 1;
    }

    return strcmp(student_a->name, student_b->name);
}

int main() {
    student_t *students = NULL;
    int students_capacity = 0;
    int student_count = 0;

    char line[1024];
    int total_votes = 0; 

    while (fgets(line, sizeof(line), stdin)) {
        int vote_count;
        char name[1024];
        sscanf(line, "%d %[^\n]", &vote_count, name);

        if (student_count == 0) {
            total_votes = vote_count;
        } else {
            int existing_student_index = -1;
            for (int i = 0; i < student_count; i++) {
                if (strcmp(students[i].name, name) == 0) {
                    existing_student_index = i;
                    break;
                }
            }

            if (existing_student_index != -1) {
                students[existing_student_index].vote_count += vote_count;
            } else {
                if (student_count >= students_capacity) {
                    students_capacity = (students_capacity + 1) * 2;
                    student_t *new_students = realloc(students, students_capacity * sizeof(student_t));
                    if (new_students == NULL) {
                        fprintf(stderr, "Error: Memory reallocation failed\n");
                        return 1;
                    }
                    students = new_students;
                }

                students[student_count].name = strdup(name);
                students[student_count].vote_count = vote_count;
                student_count++;
            }
        }
    }

    if (student_count == 0) {
        printf("Žiadni študenti.\n");
    } else if (student_count == 1) {
        printf("Vysledky:\n");
        printf("%d %s\n", total_votes, students[0].name);
    } else {
        qsort(students, student_count, sizeof(student_t), compare_students);
        printf("Vysledky:\n");
        for (int i = 0; i < student_count; i++) {
            printf("%d %s\n", students[i].vote_count, students[i].name);
        }
    }

    for (int i = 0; i < student_count; i++) {
        free(students[i].name);
    }
    free(students);

    return 0;
}