pvjc25/du4/program.c

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

#define MAX_M 100
#define MAX_S 100


typedef struct {
    char meno[MAX_M];
    int hlasy;
} Student;


int najdi_studenta(Student studenti[], int pocet, char *meno) {
    for (int i = 0; i < pocet; i++) {
        if (strcmp(studenti[i].meno, meno) == 0) {
            return i;
        }
    }
    return -1;
}


int porovnaj(const void *a, const void *b) {
    Student *s1 = (Student *)a;
    Student *s2 = (Student *)b;

   
    if (s2->hlasy != s1->hlasy) {
        return s2->hlasy - s1->hlasy;
    }
    
    return strcmp(s1->meno, s2->meno);
}


int je_cislo(const char *retazec) {
    while (*retazec) {
        if (!isdigit(*retazec)) {
            return 0;
        }
        retazec++;
    }
    return 1;
}

int main() {
    Student studenti[MAX_S];
    int pocet_studentov = 0;
    char meno[MAX_M];
    char vstup[MAX_M + 10]; 
    int hlasy;
    int nacitane = 0; 

    
    while (fgets(vstup, sizeof(vstup), stdin) != NULL){ 
        vstup[strcspn(vstup, "\n")] = 0;

    
        if (strlen(vstup) == 0) {
            break;
        }

       
        if (sscanf(vstup, "%d %[^\n]", &hlasy, meno) != 2 || hlasy <= 0) {
            printf("Nepodarilo nacitat nic\n");
            return 1;
        }

        nacitane = 1;

        int index = najdi_studenta(studenti, pocet_studentov, meno);
        if (index != -1) {
            studenti[index].hlasy += hlasy;
        } else {
            if (pocet_studentov >= MAX_S) {
                printf("Nepodarilo nacitat nic\n");
                return 1;
            }
            strcpy(studenti[pocet_studentov].meno, meno);
            studenti[pocet_studentov].hlasy = hlasy;
            pocet_studentov++;
        }
    }

    
    if (!nacitane) {
        printf("Nepodarilo nacitat nic\n");
        return 1;
    }

    
    qsort(studenti, pocet_studentov, sizeof(Student), porovnaj);

    
    printf("Vysledky:\n");
    for (int i = 0; i < pocet_studentov; i++) {
        printf("%d %s\n", studenti[i].hlasy, studenti[i].meno);
    }

    return 0;
}