одномерный массив с++

#include <iostream>
#include <vector>
#include <algorithm>
#include <iterator>
#include <numeric>
 
int main()
{
    std::vector <int> v{ -8, 10, 0, -1,  4, -6, 7,  21, -5, 0, -3, 34, -10 };
 
    std::cout << " max element in position ---> " << std::max_element(begin(v), end(v)) - begin(v) << std::endl;
 
    auto zerro_1 = std::find(begin(v), end(v), 0);
    
    if (zerro_1 == end(v)) {
        std::cout << "No zerro element odnako\n";
    }
    else {
        auto pos1_0 = zerro_1 - begin(v);
        std::cout << "The first 0 in position ---> " << pos1_0 << std::endl;
        auto zerro_2 = std::find(begin(v) + pos1_0 + 1, end(v), 0);
        if (zerro_2 == end(v)) {
            std::cout << " No second zerro ";
            system("pause");
            return 1;
        }
        else {
            auto pos2_0 = zerro_2 - begin(v);
            std::cout << "The second 0 in position ---> " << pos2_0 << std::endl;
            std::cout << "Sum: " << std::accumulate(begin(v) + pos1_0, begin(v) + pos2_0, 0) << "\n";
        }
    }
 
    size_t i = 1;
 
    std::stable_partition(begin(v), end(v), [&i](auto const& el) {++i;  return i % 2 != 0; });
 
    std::copy(begin(v), end(v), std::ostream_iterator<int>(std::cout, "   "));
 
    system("pause");
}