#include <iostream>
#include <vector>

int main() {
    std::vector<int> v { 1, 2, 3, 4 };
    auto it = cend(v);
    --it;
    std::cout << (*it) << std::endl;
    it--;
    std::cout << (*it) << std::endl;
    it = prev(it);
    std::cout << (*it) << std::endl;
}