periodican

#include "iostream"
#include "vector"

int period (std::vector<int> v)
{
        int t {1};
        for (int i {0}; i < static_cast<int> (v.size()) - t; i++)
                if (v.at (i) != v.at (i + t) )
                {
                        t++;
                        i = -1;
                }
        return t != static_cast<int> (v.size()) ? t : 0;
}
int main()
{
        std::vector <int> v;
        std::cout << "Unesite niz brojeva (nula za prekid) :" << std::endl;
        while (1)
        {
                int i;
                std::cin >> i;
                if (i == 0)
                        break;
                v.push_back (i);
        }
        period (v) ? std::cout << "Period unesenih brojeva je " << period (v) << std::endl :
                                 std::cout << "Uneseni brojevi nisu periodicni!" << std::endl;
}