spectacole si cuie

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

typedef struct
{
    int ti,tf;
} spectacol;

int cmp(const void *a,const void *b)
{
    spectacol va=*(spectacol*)a;
    spectacol vb=*(spectacol*)b;

    if(va.tf == vb.tf)
    {
        return (va.ti-vb.ti);
    }

    return (va.tf-vb.tf);
}

void greedy(FILE *fout, int n, spectacol *v)
{
    fprintf(fout, "Spectacolele selectate sunt:\n");
    fprintf(fout, "%d %d\n", v[0].ti, v[0].tf);
    spectacol ultspectbun = v[0];

    int i, cnt = 1;
    for(i = 1; i < n; i++)
    {
        if(v[i].ti >= ultspectbun.tf)
        {
            cnt++;
            ultspectbun = v[i];
            fprintf(fout, "%d %d\n", v[i].ti, v[i].tf); //pentru cuie afisam doar timpul de terminare si modific denumirile
        }
    }

    fprintf(fout, "Au fost selectate %d spectacole.\n", cnt);
}

int main()
{   FILE *fin, *fout;

    fin = fopen("date.in","r");
    fout = fopen("date.out","w");

    int n;
    // printf("Numarul de spectacole este :\n");
    fscanf(fin, "%d%*c", &n);
    spectacol *v = (spectacol*)malloc(n* sizeof(spectacol));

    int i;
    // printf("Orele de inceput si de final sunt:\n");
    for(i = 0; i < n; ++i)
    {
        fscanf(fin, "%d %d%*c", &v[i].ti, &v[i].tf);
    }

    qsort(v, n, sizeof(spectacol), cmp);

    greedy(fout, n, v);

    return 0;
}