#include <algorithm>
#include <iostream>
#include <vector>

std::vector<int>::iterator returnFive(std::vector<int>& vec)
{
    for(std::vector<int>::iterator ptr = std::begin(vec); ptr != std::end(vec); ptr++)
    {
        if(*ptr == 5)
            return ptr;
    }

    return std::end(vec);

}
int main()
{
    std::vector<int> vec{1, 2, 3, 4, 5, 6, 7, 8};
    std::cout << *returnFive(vec) << '\n';

    return 0;
}