pvjc24/cv5/program.c

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

#define SIZE 100

struct student {
    char name[SIZE];
    int votes;
};

int find_student(struct student *students, int size, const char *name);
int compare(const void *p1, const void *p2);

struct student databaza[SIZE];
int size = 0;

char line[SIZE];

int main() {
    memset(databaza, 0, SIZE * sizeof(struct student));

    int prvy_vstup = 1;

    while (1) {
        memset(line, 0, SIZE);
        char *r = fgets(line, SIZE, stdin);

        if (r == NULL) {
            break;
        }

        if (strcmp(line, "\n") == 0) {
            continue;
        }

        int value = strtol(line, NULL, 10);
        if (value == 0) {
            if (prvy_vstup) {
                printf("Nepodarilo nacitat nic.\n");
                return 0;
            } else {
                break;
            }
        }

        prvy_vstup = 0;

        char name[SIZE];
        memset(name, 0, SIZE);
        char *zaciatok_mena = strchr(line, ' ') + 1;
        int velkost_mena = strlen(zaciatok_mena) - 1;

        if (velkost_mena > 0) {
            memcpy(name, zaciatok_mena, velkost_mena);
            name[velkost_mena] = '\0';
        } else {
            printf("Nepodarilo sa nacitat meno\n");
            return 0;
        }

        int find_student(struct student *students, int size, const char *name) {
            for (int i = 0; i < size; ++i) {
                if (strcmp(students[i].name, name) == 0) {
                    return i;
                }
            }
            return -1;
        }

        int id = find_student(databaza, size, name);
        if (id < 0) {
            strcpy(databaza[size].name, name);
            databaza[size].votes = value;
            size += 1;
        } else {
            databaza[id].votes += value;
        }
    }

    qsort(databaza, size, sizeof(struct student), compare);

    printf("Vysledky:\n");

    for (int i = 0; i < size; ++i) {
        printf("%d %s\n", databaza[i].votes, databaza[i].name);
    }

    return 0;
}

int compare(const void *p1, const void *p2) {
    struct student *s1 = (struct student *)p1;
    struct student *s2 = (struct student *)p2;

    if (s1->votes < s2->votes) {
        return 1;
    } else if (s1->votes > s2->votes) {
        return -1;
    }

    return strcmp(s1->name, s2->name);
}