#include <iostream>
#include <vector>

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