binary

#include <iostream>

using namespace std;

struct Student
    {
        string prezime, ime;

    };

int binarnaKraj(Student niz[], int maxGr, Student novi, int minGr=0)
{
    if(minGr>maxGr)
        return -1;
    else
    {

        if(novi.ime[0] == niz[(minGr+maxGr)/2].ime[0]  && novi.prezime == niz[(minGr+maxGr)/2].prezime[0]){
            if((niz[(minGr+maxGr)/2+1].ime[0]== novi.ime[0] && novi.prezime == niz[(minGr+maxGr)/2+1].prezime[0]) || (niz[(minGr+maxGr)/2-1].ime[0]== novi.ime[0] && novi.prezime == niz[(minGr+maxGr)/2-1].prezime[0]))
            return binarnaKraj(niz, maxGr+1, element, minGr);
            else
            return (minGr+maxGr)/2;
        }

        else if(element < niz[(minGr+maxGr)/2])
        {
            return binarnaKraj(niz, (minGr+maxGr)/2-1, element, minGr);
        }

        else
        {
            return binarnaKraj(niz, maxGr, element, (minGr+maxGr)/2+1);
        }
    }

}

int binarnaPocetak(Student* niz, int maxGr, Student novi, int minGr=0)
{
    if(minGr>maxGr)
        return -1;
    else
    {
        if(novi.ime[0] == niz[(minGr+maxGr)/2].ime[0]  && novi.prezime == niz[(minGr+maxGr)/2].prezime[0]){
            if((niz[(minGr+maxGr)/2+1].ime[0]== novi.ime[0] && novi.prezime == niz[(minGr+maxGr)/2+1].prezime[0]) || (niz[(minGr+maxGr)/2-1].ime[0]== novi.ime[0] && novi.prezime == niz[(minGr+maxGr)/2-1].prezime[0]))
            return binarnaPocetak(niz, maxGr-1, element, minGr);
            else
            return (minGr+maxGr)/2;
        }

        else if(element < niz[(minGr+maxGr)/2])
        {
            return binarnaPocetak(niz, (minGr+maxGr)/2-1, element, minGr);
        }

        else
        {
            return binarnaPocetak(niz, maxGr, element, (minGr+maxGr)/2+1);
        }
    }

}

string dajEmail(Student studenti[], int brojStudenata, Student novi)
{
    int broj=binarnaKraj(studenti, brojStudenata, novi)-binarnaPocetak(studenti, brojStudenata, novi);

     string s1=novi.ime[0];
     string s2=novi.prezime;
     char s3=char(broj);
     s1+=s2;
    return s1+=broj;
}

int main()
{
    Student niz[2]= {{"Adijata", "Vukas"}, {"Adela", "Vukas"}};

    cout << dajEmail(niz, 2 , {"Amela", "Vukas"});

    return 0;
}