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int k = 1;
void bkt(int poz)
{
    if (poz == n)
    {
        if (okay() == 1)
            display();
    }
    else
    {
        for (int i = k; i <= el_maxim - ( n - k); i++)
        {
            sol[poz] = i;
            bkt(poz + 1);
        }
        k++;
    }
}

prog.cpp:4:16: error: use of undeclared identifier 'n'
    if (poz == n)
               ^
prog.cpp:6:13: error: use of undeclared identifier 'okay'
        if (okay() == 1)
            ^
prog.cpp:7:13: error: use of undeclared identifier 'display'
            display();
            ^
prog.cpp:11:43: error: use of undeclared identifier 'n'
        for (int i = k; i <= el_maxim - ( n - k); i++)
                                          ^
prog.cpp:11:30: error: use of undeclared identifier 'el_maxim'
        for (int i = k; i <= el_maxim - ( n - k); i++)
                             ^
prog.cpp:13:13: error: use of undeclared identifier 'sol'
            sol[poz] = i;
            ^
6 errors generated.

Standard output is empty