pvjc24/cv10/program.c

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

#define MAX_NAME_LENGTH 100

int compare(const void *a, const void *b) {
    const char *name1 = *(const char **)a;
    const char *name2 = *(const char **)b;
    return strcmp(name1, name2);
}

int main() {
    int max_students;
    char name[MAX_NAME_LENGTH];
    char **names = NULL;
    int size = 0, capacity = 10;

    names = (char **)malloc(capacity * sizeof(char *));
    if (names == NULL) {
        puts("Memory allocation error");
        return 1;
    }

    if (scanf("%d\n", &max_students) != 1 || max_students <= 0) {
        puts("Nespravny vstup");
        free(names);
        return 1;
    }

    while (fgets(name, MAX_NAME_LENGTH, stdin) != NULL) {
        if (name[0] == '\n') break;
        name[strcspn(name, "\n")] = 0;

        int duplicate = 0;
        for (int i = 0; i < size; i++) {
            if (strcmp(names[i], name) == 0) {
                duplicate = 1;
                break;
            }
        }
        if (duplicate) continue;

        if (size == capacity) {
            capacity *= 2;
            names = (char **)realloc(names, capacity * sizeof(char *));
            if (names == NULL) {
                puts("Memory allocation error");
                return 1;
            }
        }

        names[size] = strdup(name);
        if (names[size] == NULL) {
            puts("Memory allocation error");
            return 1;
        }
        size++;
    }

    if (size == 0) {
        puts("Ziadne prihlasky");
        free(names);
        return 1;
    }

    qsort(names, size, sizeof(char *), compare);

    puts("Prijati studenti:");
    int accepted = size < max_students ? size : max_students;
    for (int i = 0; i < accepted; i++) {
        puts(names[i]);
    }

    if (size > max_students) {
        puts("Neprijati studenti:");
        for (int i = max_students; i < size; i++) {
            puts(names[i]);
        }
    }

    for (int i = 0; i < size; i++) {
        free(names[i]);
    }
    free(names);
    return 0;
}