2011 popravni je_li_matrica

#include <iostream>
#include<vector>
#include<stdexcept>

void funkcija(std::vector<std::vector<int>> v)
{
    for (int i(0); i<v.size(); i++)
    {
      if (v[0].size() != v[i].size())
        throw std::domain_error("Nije matrica.");
    }

}
int main()
{
    std::vector<std::vector<int>> v{{1, 2,3,6}, {4,5,6}, {7,8,9} };
    try
    {
        funkcija(v);
    }
    catch(std::domain_error poruka)
    {
        std::cout<<poruka.what()<<std::endl;
    }
    return 0;


    }