typedef struct cvor{
	int v;
	struct cvor *l;
	struct cvor *d;
} CVOR;

CVOR* kreiraj_cvor(int v);
void dodaj_cvor(CVOR **koren, int v);
void ispisi(CVOR *koren);
CVOR *obrisi(CVOR *koren);
CVOR *ucitaj_drvo_std();
int pronadji(CVOR *koren, int v);